- Simple thiophene-bridged D-π-A type chromophores for DSSCs: a comprehensive study of their sensitization and co-sensitization properties
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Herein, we report the design and synthesis of four new thiophene-bridged D-π-A configured organic dyes T1-4 comprising different donors, π-spacers and anchoring units, as potential sensitizers and co-sensitizers for DSSCs. The current work also highlights their structural, photophysical, thermal, electrochemical, theoretical, and photoelectrochemical studies, including evaluation of their structure-property relationships. The optical results revealed that the dyes T1-4 display λabs and λemi in the range of 402-461 nm and 556-575 nm, respectively, with a bandgap in the order of 2.31-2.58 eV. Furthermore, the results showed that the dyes possess all the pre-requisites to act as sensitizers/co-sensitizers. Among the tested dyes, the device based on sensitizer T2 achieved the highest PCE compared to the other three dyes, under the standard conditions. Furthermore, their co-sensitized devices were fabricated by co-adsorbing them with the well-known Ru-based MH-12 sensitizer and interestingly the co-sensitizer T3 carrying an alkoxy group and a barbituric acid anchor displayed the highest PCE of 8.79%, which is much higher than that of MH-12 alone (8.18%). Conclusively, the study furnishes a deeper understanding of the intricacies involved in the structural modification of sensitizers/co-sensitizers in achieving an enhanced performance of the devices. This journal is
- Abdellah, Islam M.,Adhikari, Airody Vasudeva,El-Shafei, Ahmed,Keremane, Kavya S.,Naik, Praveen
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Read Online
- Trihydrazone functionalized cyanopyridine discoids: Synthesis, mesogenic and optical properties
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A new series of trihydrazone functionalized cyanopyridine derivatives (CPTH-Dm) carrying 3,4-dialkoxyphenyl groups was designed and synthesized successfully as discotic columnar liquid crystals. These new discoid mesogens display hexagonal colu
- Ahipa,Adhikari, Airody Vasudeva
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Read Online
- Columnar self-assembly of novel benzylidenehydrazones and their difluoroboron complexes: Structure-property correlations
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Organoboron complexes are considered to be an important class of optically dynamic materials and because of their imperative properties, they have been unceasingly studied in a wide range of scientific areas. In this context, a new family of D-A-D′ archit
- Vinayakumara,Swamynathan,Kumar, Sandeep,Adhikari, Airody Vasudeva
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Read Online
- New cyanopyridone based luminescent liquid crystalline materials: Synthesis and characterization
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A new series of 4-(3,4-bis(akyloxy)phenyl)-6-(4-((1-(4-cyano- or 4-nitro-benzyl)-1H-1,2,3-triazol-4-yl)-methoxy)phenyl)-2-oxo-1,2-dihydropyridine-3-carbonitriles carrying terminal di-alkoxy chain lengths (viz. octyloxy, decyloxy, dodecyloxy, tetradecyloxy
- Ahipa,Adhikari, Airody Vasudeva
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Read Online
- Supramolecular columnar self-assembly of wedge-shaped rhodanine based dyes: Synthesis and optoelectronic properties
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The development of small π-conjugated functional organic molecules capable of forming supramolecular columnar self-assembly, is a rapidly growing area of material research. In this context, the present work describes the design and synthesis of a new seri
- Vinayakumara,Kumar, Sandeep,Adhikari, Airody Vasudeva
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Read Online
- Columnar self-assembly, electrochemical and luminescence properties of basket-shaped liquid crystalline derivatives of Schiff-base-moulded: P-tert -butyl-calix[4]arene
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A new family of supramolecular liquid crystalline compounds with a calix[4]arene core and two linking groups appended on four sides, exhibiting a wide range of hexagonal columnar phases, has been synthesised and well characterised. The liquid crystal beha
- Sharma, Vinay S.,Sharma, Anuj S.,Worthington, Sheena J. B.,Shah, Priyanka A.,Shrivastav, Pranav S.
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Read Online
- Synthesis, mesomorphism, photophysics and device performance of liquid-crystalline pincer complexes of gold(iii)
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Emissive gold(iii) complexes of pincer 2,6-diphenylpyridines also bearing a phenylacetylide ligand have been modified at both the pincer and phenylacetylide to confer liquid crystalline properties, with most complexes showing a columnar hexagonal phase in
- Parker, Rachel R.,Liu, Denghui,Yu, Xiankang,Whitwood, Adrian C.,Zhu, Weiguo,Williams,Wang, Yafei,Lynam, Jason M.,Bruce, Duncan W.
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supporting information
p. 1287 - 1302
(2021/02/12)
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- Synthesis and mesomorphic characterization of some novel steroidal mesogens: A structure–property correlation
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The steroidal derivatives are found to be extremely good mesogens since their inception. Because of their inherent chirality, they have the potential to induce a wide variety of liquid crystalline phases, including frustrated phases depending upon the structure of the steroidal skeleton and the substituents attached. In this report, a series of novel monoalkoxy and dialkoxy benzoate derivatives of ergosterol and a few monoalkoxy derivatives of stigmasterol have been synthesized and their mesomorphic property has been investigated. The derivatives exhibited various mesophases including SmA, SmC*, N*, TGB and blue phases. Also, the gelation ability of some of these derivatives with various organic solvents has been examined. Furthermore, the mesomorphism of these derivatives has been compared with the analogous cholesteryl counterparts.
- Bhat S, Vanishree,Kumar, Sandeep,Raghunathan, V. A.
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- Compound with circularly polarized light emission (by machine translation)
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The subject matter relates to fluorescent compounds having aggregation-induced emission (AIE) characteristics. The compound may be a rod-like chiral emitter having a chiral moiety at one end and an aliphatic long chain at the other end. The compound emits circularly polarized light or light emission (CPL) in an aggregate state, for example, when dispersed in a solution, the compound does not exhibit an optical signal, but shows an adjustable CPL signal in an aggregated state. (by machine translation)
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Paragraph 0148
(2020/06/09)
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- Fabrication of deoxycholic acid tethered α-cyanostilbenes as smart low molecular weight gelators and AIEE probes for bio-imaging
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Four novel deoxycholic acid tethered α-cyanostilbenes were designed, synthesized and characterized using detailed spectroscopic analysis. The synthesized deoxycholic acid tethered α-cyanostilbene derivatives formed stable gels with a variety of solvents,
- Agarwal, Devesh S.,Jha, Prabhat N.,Prakash Singh, Rajnish,Sakhuja, Rajeev
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- Flavylium Salts: A Blooming Core for Bioinspired Ionic Liquid Crystals
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Thermotropic ionic liquid crystals based on the flavylium scaffold have been synthesized and studied for their structure-properties relationship for the first time. The mesogens were probed by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction (XRD). Low numbers of alkoxy side chains resulted in smectic (SmA) and lamello-columnar (LamCol) phases, whereas higher substituted flavylium salts showed Colro as well as ordered and disordered columnar (Colho, Colhd) mesophases. Mesophase width ranged from 13 K to 220 K, giving access to room temperature liquid crystals. The optical properties of the synthesized compounds were probed towards absorption and emission properties. Strong absorption with maxima between 444 and 507 nm was observed, and some chromophores were highly emissive with quantum yields up to 99 %. Ultimately, mesogenic and dye properties were examined by temperature-dependent emissive experiments in the solid state.
- Forschner, Robert,Knelles, Jakob,Bader, Korinna,Müller, Carsten,Frey, Wolfgang,K?hn, Andreas,Molard, Yann,Giesselmann, Frank,Laschat, Sabine
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supporting information
p. 12966 - 12980
(2019/11/05)
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- Effect of regioisomerism on the self-assembly, photophysical and gelation behavior of aroylhydrazone based polycatenars: Synthesis and characterization
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In this paper we report five series of aroylhydrazone based polycatenars differing from each other in number and position of alkoxy chains on one end of the core; keeping other end the same. A systematic variation in the structures was carried out to understand the effect of position and chain length on the mesophase behavior. In the case of single alkoxy chain at 4-position, there is a transition from Smectic C to Smectic A mesophase during cooling and Smectic A to Smectic C transition in heating cycle in all the homologues except n = 6 & n = 8. In the case of two alkoxy chains at 3-, 5-positions, the compounds are non-mesogenic in nature. On changing the position of alkoxy chains from 3-, 5-positions to 3-, 4-positions, intermolecular forces weaken and these compounds become liquid crystalline and show columnar rectangular mesophase resulting from the effect of regioisomerism. Moving on to the series with three alkoxy chains, it was observed that 2-, 3-, 4-trialkoxy substituted compounds exhibit columnar rectangular mesophase except lower chain length (n = 6 & 8) while 3-, 4-, 5-trialkoxy substituted aroylhydrazones show columnar rectangular mesophase; except n = 10 which shows columnar oblique mesophase. Thus it was established that on increasing density of alkoxy chains around one terminal, mesophase changes from smectic to columnar mesophase. Temperature dependent Raman studies confirm the presence of intermolecular hydrogen bonding. Further, effect of substitution pattern did not show much influence on the photophysical properties of the mesogenic series in solid and solution state. However, the non-mesogenic series showed a different absorption and emission transition from the mesogenic series in solid and solution state. Solid state fluorescence studies show almost similar emission maxima in all the series. However, it was also noticed that non-mesogenic series show maximum red shifted emission maxima in solid state as compared to that of solution. All the series showed good gelation properties with less than 1% CGC (wt%) suggesting the strong ability of molecules to form gel. These H-bonded liquid-crystalline gels have immense potential for applications in emissive displays.
- Kanth, Priyanka,Singh, Hemant Kumar,Kumar, Vijay,Singh, Sachin Kumar,Rao, D.S. Shankar,Prasad, S. Krishna,Singh, Bachcha
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- Peripheral Substitution of Tetraphenyl Porphyrins: Fine-Tuning Self-Assembly for Enhanced Electroluminescence
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This study reports the synthesis of two novel zinc porphyrin families bearing four or eight alkoxy chains at their peripheral phenyl rings, with the length of the alkoxy chains ranging from 2, to 6, and to 12 carbon atoms. All zinc porphyrin derivatives were fully characterized with respect to their photophysical and electrochemical features. The zinc porphyrins could be processed into thin films which, depending on the length of the alkoxy chains on the aryl substituents, were found to be either of an ordered or a disordered nature, as it is revealed by spectroscopic and microscopic techniques. The films containing ordered self-assemblies displayed significantly enhanced electrical conductivity compared to the disordered films. This led to remarkable differences regarding their electroluminescence response that occurs at lower bias. Furthermore, their luminous efficiency was of almost one order of magnitude higher than that of disordered films.
- Charisiadis, Asterios,Bagaki, Anthi,Fresta, Elisa,Weber, Katharina T.,Charalambidis, Georgios,Stangel, Christina,Hatzidimitriou, Antonios G.,Angaridis, Panagiotis A.,Coutsolelos, Athanassios G.,Costa, Rubén D.
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p. 254 - 265
(2018/04/24)
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- Luminescent columnar liquid crystals based on AIE tetraphenylethylene with hydrazone groups bearing multiple alkyl chains
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A series of novel tetraphenylethylene aromatic acylhydrazone derivatives 11, 12 and 13 with 4, 8 or 12 alkyl chains were designed and synthesized in yields of 82–85%. Studies on the mesomorphic properties suggested the ordered hexagonal columnar mesophase
- Jiang, Shengjie,Qiu, Jiabin,Chen, Yunxiang,Guo, Hongyu,Yang, Fafu
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p. 533 - 541
(2018/07/29)
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- Anhydrous proton conduction in self-assembled and disassembled ionic molecules
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In polymer based ionic conductors, the conductivity is suppressed by a low degree of chain mobility, therefore it is imperative to design a molecular system in which ionic groups can be mobilized and immobilized as a function of temperature to allow ions
- Kumar, Avneesh,Pisula, Wojciech,Sieber, Christoph,Klapper, Markus,Müllen, Klaus
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p. 6074 - 6084
(2018/04/12)
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- Hydrogen bond-driven columnar self-assembly of electroluminescent D-A-D configured cyanopyridones
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Herein, we report the design and synthesis of a new series of flying bird-shaped liquid crystalline (LC) cyanopyridone derivatives with a D-A-D architecture, CPO-1 to CPO-4. Their mesomorphic, photophysical, electrochemical, and electroluminescence charac
- Vinayakumara,Ulla, Hidayath,Kumar, Sandeep,Pandith, Anup,Satyanarayan,Rao, D. S. Shankar,Prasad, S. Krishna,Adhikari, Airody Vasudeva
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supporting information
p. 7385 - 7399
(2018/07/25)
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- Water-soluble BODIPY (boron-dipyrromethene) derivatives with different hydrophobic chains and preparation method of water-soluble BODIPY derivatives
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The invention relates to a synthetic method of amphiphilic BODIPY (boron-dipyrromethene) fluorescent dye derivatives. Through molecular design, a series of BODIPY derivatives with different hydrophobic chains are prepared with a Grignard reaction and a qu
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Paragraph 0057; 0058; 0059
(2016/10/10)
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- Two new bulky substituted Zn porphyrins bearing carboxylate anchoring groups as promising dyes for DSSCs
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Two novel zinc-metallated porphyrins (ZnP3C and ZnP6C), bearing three and six long alkoxy chains at the periphery of each porphyrin and a terminal carboxylic acid group, have been synthesized and fully characterized. Photophysical and electrochemical meas
- Charisiadis, Asterios,Nikolaou, Vasilis,Karikis, Kostas,Giatagana, Chrysa,Chalepli, Konstantina,Ladomenou, Kalliopi,Biswas, Suhayan,Sharma, Ganesh D.,Coutsolelos, Athanassios G.
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p. 5930 - 5941
(2016/07/16)
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- Molecular order and mesophase investigation of thiophene-based forked mesogens
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Thiophene-based rodlike molecules constructed from a three phenyl ring core and terminal dialkoxy chains recognized as forked mesogens are synthesized, and their mesophase properties as well as the molecular order are investigated. The synthesized forked
- Reddy, K. Rajasekhar,Lobo, Nitin P.,Narasimhaswamy
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p. 6897 - 6909
(2016/07/26)
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- Tuning the thermotropic properties of liquid crystalline p-substituted aroylhydrazones
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The synthesis and mesomorphic properties of forty substituted aroylhydrazones with peripheral mono-, di- and tri- alkoxy chains derived from a p-amino aroylhydrazone core are described. The compounds with two side chains exhibited a smectic A phase, while the compounds with six soft alkoxy side chains at symmetrical positions formed a rectangular columnar mesophase. The structures of these mesophases were confirmed by differential scanning calorimetry (DSC) analysis, polarized optical microscopy (POM) and powder X-ray diffraction (XRD) studies. Raman studies with the help of density functional theory on some of the mesogenic members have been performed to understand the changes in the intermolecular interactions during phase transitions. A structure-property relationship has been deduced, and mesogenic properties are found to be dependent on the chain length, density and position of the alkoxy chains around the molecular core.
- Singh, Hemant Kumar,Singh, Sachin Kumar,Nandi, Rajib,Singh, Madan Kumar,Kumar, Vijay,Singh, Ranjan K.,Rao, D. S. Shankar,Prasad, S. Krishna,Singh, Bachcha
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p. 44274 - 44281
(2015/06/02)
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- Facile bottom-up synthesis of coronene-based 3-fold symmetrical and highly substituted nanographenes from simple aromatics
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A facile and efficient self-sorting assemble (CSA) strategy has been paved for bottom-up construction of the 3-fold symmetrical and highly substituted hexa-cata-hexabenzocoronenes (c-HBCs), the trithieno analogues, and larger disc-shaped PAHs from simple
- Zhang, Qiang,Peng, Hanqing,Zhang, Guishan,Lu, Qiongqiong,Chang, Jian,Dong, Yeye,Shi, Xianying,Wei, Junfa
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supporting information
p. 5057 - 5064
(2014/04/17)
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- Supergelation via purely aromatic π-π Driven self-assembly of pseudodiscotic oxadiazole mesogens
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A series of highly luminescent oxadiazole-based stilbene molecules (OXD4, OXD8, OXD10, and OXD12) exhibiting interesting enantiotropic liquid crystalline and gelation properties have been synthesized and characterized. The molecules possessing longer alkyl substituents, OXD10 and OXD12, possess a pseudodisc shape and are capable of behaving as supergelators in nonpolar solvents, forming self-standing gels with very high thermal and mechanical stability. Notably the self-assembly of these molecules, which do not possess any hydrogen-bonding motifs normally observed in most reported supergelators, is driven purely by π-stacking interactions of the constituent molecules. The d-spacing ratios estimated from XRD analysis of OXD derivatives possessing longer alkyl chains show that the molecules are arranged in a columnar fashion in the mesogens and the self-assembled nanofibers formed in the gelation process.
- Sivadas, Aneesh P.,Kumar, N. S. Saleesh,Prabhu, Deepak D.,Varghese, Shinto,Prasad, S. Krishna,Rao, D. S. Shankar,Das, Suresh
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supporting information
p. 5416 - 5423
(2014/05/06)
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- Self-assembly of hekates-tris(N -salicylideneaniline)s into columnar structures: Synthesis and characterization
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Two series of new, photoluminescent star-shaped discotic liquid crystals, recently termed as "hekates", derived from tris(N-salicylideneaniline) s (TSANs), were synthesized by the facile threefold condensation of 3,4-bis(alkoxy)phenyl 4-aminobenzoates/3,4,5-tris(alkoxy) phenyl 4-aminobenzoates with 1,3,5-triformylphloroglucinol and characterized. These two series of discotics with six and nine peripheral n-alkoxy tails were especially designed and accomplished to understand the relation between mesomorphic/photophysical properties and molecular structure. Proton NMR spectral analysis revealed their existence as an inseparable mixture of two keto-enamine tautomeric forms featuring C3h and Cs rotational symmetries. A systematic study into the thermotropic liquid crystal behavior using polarizing optical microscopy, differential scanning calorimetry, and X-ray scattering confirmed the presence of columnar (Col) phase in vast majority of the TSANs prepared. The two-dimensional (2D) lattices of these fluid columnar phases were found to be characteristic of hexagonal Col (Col h), rectangular Col (Colr), or oblique Col (Col ob) phases depending on the number/length of the peripheral flexible chains. The stabilization of the Colob phase, a less commonly found fluid columnar structure, and the first of its kind in TSAN systems, implies very intensive intermolecular (face-to-face) interactions among the TSAN cores within the column. The photophysical properties were investigated both in solution and the columnar states by UV-vis absorption and photoluminescence; markedly, the solution state emits light in the blue region. The light-emitting ability of the Col phase is particularly significant given the possibility that, in such cores, the protons and electrons interact with each other through the H-bonding environment.
- Achalkumar, Ammathnadu S.,Hiremath, Uma S.,Rao, D. S. Shankar,Prasad, S. Krishna,Yelamaggad, Channabasaveshwar V.
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p. 527 - 544
(2013/03/13)
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- Discotic liquid crystals of transition metal complexes 44:
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We have synthesized novel hexaphenoxy-substituted phthalocyanine derivatives, 2-(12-hydroxydodecyloxy)-3-methoxy-9,10,16,17,23,24-hexakis(3,4-di- n-alkoxyphenoxy)phthalocyaninato copper(II) (abbreviated as C n(OC12OH)PcCu: n = 10, 12
- Ariyoshi, Masaaki,Sugibayashi-Kajita, Makiko,Suzuki-Ichihara, Ayumi,Kato, Takayuki,Kamei, Tenpei,Itoh, Eiji,Ohta, Kazuchika
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p. 1114 - 1123
(2013/01/15)
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- Peripherally fused porphyrins via the Scholl reaction: Synthesis, self-assembly, and mesomorphism
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Oxidative coupling of activated aryl groups attached to β-positions of the porphyrin ring provides convenient access to derivatives containing peripherally fused phenanthrene and benzo[g]chrysene units. Tetra(benzochryseno) porphyrin, reported here for the first time, contains a nonplanar, sterically locked π system and shows very intense electronic absorptions in the Q range of the electronic spectrum. Tetraphenanthroporphyrins show a tendency to aggregate in solution. In one case, a discrete dimer is formed, whose structure was investigated spectroscopically and theoretically. Derivatives bearing long alkyl chains are mesomorphic and exhibit columnar phases (tetraphenanthroporphyrins) and a monoclinic 3D phase (tetrabenzochrysenoporphyrin). The symmetry of column packing in the columnar phases is dependent on the number of alkyl chains per molecule. X-ray diffraction measurements show that, in spite of their nonplanarity, the aromatic cores in the mesophases are tightly stacked within the column. The corresponding stacking patterns were derived from the structure of the dimer, on the basis of geometrical analysis and molecular modeling.
- Mysliwiec, Damian,Donnio, Bertrand,Chmielewski, Piotr J.,Heinrich, Benoit,Stepien, Marcin
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supporting information; experimental part
p. 4822 - 4833
(2012/05/19)
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- POLYMERS WITH BODIPY-BASED BACKBONE FOR SOLAR CELLS
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The present application discloses the preparation of BODIPY-based backbone polymers for use in solar cell devices. Embodiments provide efficient solution-processed bulk heterojunction ("BHJ") polymer/PCBM solar cells with BODIPY-based backbone polymers (p
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Page/Page column 56-57; 41/55
(2010/07/09)
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- A new family of bent-core C2-symmetric liquid crystals
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A series of C2-symmetric compounds with different core sizes and varying lengths and numbers of alkoxy side chains were prepared, and the factors influencing their liquid crystalline mesophase behaviour were investigated. The compounds studied were based on benzophenone, dibenzylidene-acetone, and 1,9-diphenyl-nona-1,3,6,8-tetraen-5-one cores with either 1 or 2 linear alkoxy side chains. The side chains were varied in length from C6H13 to C12H25. The liquid crystalline mesophase behaviour of the compounds was investigated using differential scanning calorimetry, polarizing optical microscopy, and small-angle X-ray scattering (SAXS). It was found that a number of the molecules were able to self-assemble into smectic and nematic liquid crystalline phases.
- Hope-Ross, Kyle A.,Heiney, Paul A.,Kadla, John F.
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supporting information; experimental part
p. 639 - 645
(2010/08/21)
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- Discotic liquid crystals of transition metal complexes 42?: The detailed phase structures and phase transition mechanisms of two Cub mesophases shown by discotic liquid crystals based on phthalocyanine metal complexes
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We found in our previous works that the sandwich-type phthalocyanine-based rare earth metal complexes, bis[2,3,9,10,16,17,23,24-octakis(3,4- dialkoxyphenoxy)phthalocyaninato]lanthanoid(III) ({[(CnO) 2PhO]8Pc}2M,
- Mukai, Hidetomo,Yokokawa, Miho,Ichihara, Masahiro,Hatsusaka, Kazuaki,Ohta, Kazuchika
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scheme or table
p. 188 - 197
(2010/11/03)
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- Molecular recognition in anisotropic media. Binding of alkylpyridines to amphiphilic zinc porphyrins incorporated in liposomal bilayer membranes
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Two amphiphilic zinc porphyrins were incorporated into liposomal bilayer membranes, egg phosphatidylcholine (Egg PC) and dipalmitoylphosphatidylcholine (DPPC). Binding free energy of alkylpyridines to the zinc porphyrins linearly increased as the length o
- Murakami, Ryosuke,Minami, Asuka,Mizutani, Tadashi
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experimental part
p. 1437 - 1444
(2009/12/04)
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- Synthesis of a nickel bis(dithiolene) complex with strong near-infrared two-photon absorption
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The diketones 4,4'-di[3,4-bis(n-dodecyloxy)styryl]benzil and 4,4'-di[3,4-bis(n-dodecyloxy)phenylethynyl]benzil have been synthesized from 4,4'-dibromobenzil using Heck coupling with the appropriate styrene and Sonogashira coupling with the appropriate phe
- Cho, Jian-Yang,Fu, Jie,Padilha, Lazaro A.,Barlow, Stephen,Van Stryland, Eric W.,Hagan, David J.,Bishop, Maximilienne,Marder, Seth R.
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experimental part
p. 167/[915]-179/[927]
(2009/10/11)
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- TRANSITION-METAL CHARGE-TRANSPORT MATERIALS, METHODS OF FABRICATION THEREOF, AND METHODS OF USE THEREOF
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Briefly described, embodiments of this disclosure include transition-metal charge-transport materials, methods of forming transition-metal charge-transport materials, and methods of using the transition-metal charge-transport materials.
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Page/Page column 73
(2010/02/15)
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- Studies on a novel safety-catch linker cleaved by Pummerer rearrangement
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(Equation Presented) We describe the use of a sulfide linkage as a safety-catch linker. This linker is significantly stable to acidic as well as basic conditions and allows transformations to be carried out on solid supports. Moreover, its cleavage is facile by applying Pummerer rearrangement after transforming it to sulfoxide.
- Tai, Chih-Ho,Wu, Hsiao-Ching,Li, Wen-Ren
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p. 2905 - 2908
(2007/10/03)
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- Liposomes from novel photolabile phospholipids: Light-induced unloading of small molecules as monitored by PFG NMR
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A molecular dithiane-based approach to synthesis of novel photolabile phospholipids is developed. These lipids are used in formulations with egg-POPC and cholesterol to prepare light-sensitive liposomes. Irradiation of such liposomes in PBS buffer (medium
- Wan, Yongqin,Angleson, Joseph K.,Kutateladze, Andrei G.
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p. 5610 - 5611
(2007/10/03)
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- Electroluminescent liquid crystals
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A new class of liquid crystals for use as transport layers and/or emission layers in organic light-emitting diodes has been prepared. Depending on the nature and number of the terminal substituents enatiotropic nematic, smectic and columnar phases are observed. Chain branching gives rise to materials with a low melting point. Several of these liquid crystals electroluminesce in the visible region. The charge transport properties of some of these materials have been evaluated.
- Contoret, Adam,Eastwood, Amanda,Farrar, Simon,Kelly, Stephen M.,Nicholls, Edward,O'Neill, Mary,Richards, Gary,Wu, Catherine
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p. 271 - 278
(2007/10/03)
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- Liquid-crystalline properties of unsaturated piperazine-2,5-dione derivatives
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The synthesis, characterization, and mesomorphic properties of a new type of liquid-crystalline compounds, (3Z,6Z)-3,6-bis(3,4- dialkoxybenzylidene)piperazine-2,5-diones are reported. These compounds were derived from unsaturated piperazine-2,5-dione as t
- Li, Wen-Ren,Kao, Kwo-Cheng,Yo, Ying-Chih,Lai, Chung K.
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p. 1400 - 1407
(2007/10/03)
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- Novel discotic mesogen: Synthesis and liquid crystalline behavior of TAAB (tetrabenzo[b,f,j,n][1,5,9,13]tetraazacyclohexadecine) derivatives with long alkoxy chains
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The self-condensation of 3,4-dialkoxy-2-aminobenzaldehyde (alkoxy = n-C8H17O, n-C10H21O and n-C12H25O) in the presence of HBF4 gives the tetrafluoroborate salt of diprotonated oc
- Kang, Seok Ho,Kim, Miok,Lee, Hyung-Kun,Kang, Yoon-Sok,Zin, Wang-Cheol,Kim, Kimoon
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- Discotic metallomesogens: Mesophase crossover of columnar rectangular to hexagonal arrangements in bis(hydrazinato) nickel(II) complexes
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Three series of N-(3,4-dialkoxybenzylidene)-N′-(3′,4′,5′- trialkoxybenzoyl)hydrazine and their nickel(II) complexes, bis[N-(3,4-dialkoxybenzylidene)-N′-(3′,4′,5′- trialkoxybenzoyl)hydrazinato]nickel(II), were prepared and characterized. The mesomorphic properties of these disc-like compounds were also studied in terms of liquid crystallinity. The orange nickel(II) complexes with ten soft alkoxy side chains exhibited columnar disordered mesophases, which were characterized based on DSC analysis and optical polarized microscopy. Nickel complexes with shorter side chains (n = 5-8) displayed a monotropic columnar rectangular disordered (Colrd) phase; however, complexes with longer side chains showed monotropic (n = 10) and enantiotropic (n = 12, 14) columnar hexagonal disordered (Colhd) phases. Similar nickel complexes (n = 14) with eight side chains exhibited a columnar hexagonal phase, whereas complexes (n= 14) with six side chains formed crystalline phases. The structures of these columnar disordered phases were confirmed by X-ray powder diffraction. XRD data indicated that mesophase crossover from columnar rectangular (Colr) to hexagonal arrangements (Colh) was observed with increasing side chain lengths.
- Lai, Chung K.,Tsai, Chun-Hsien,Pang, Yung-Shyen
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p. 1355 - 1360
(2007/10/03)
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- Liquid-crystalline complexes of palladium(II) and platinum(II) with di- and tri-alkoxystilbazoles: Ligand control of mesomorphism
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Liquid-crystalline complexes of palladium and platinum are formed when the metals are complexed to stilbazoles (4-styrylpyridines) bearing either two or three alkoxy chains. The complexes, termed polycatenar, show smectic C mesophases for most 3,4-disubstituted ligands, while the use of trisubstituted ligands leads to complexes showing columnar organisation, demonstrating that the spatial organisation of the metals in the liquid-crystal mesophase can be rather readily controlled. Complexes of these di- and tri-substituted stilbazoles with a cis-dicarbonylchloroiridium(I) fragment were not liquid crystalline.
- Donnio, Bertrand,Bruce, Duncan W.
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p. 2745 - 2755
(2007/10/03)
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- New Series of Biforked Mesogens Derived from 3,4-Dialkoxycinnamic Acid and 3-(3',4'-Dialkoxyphenyl)Propanoic Acid
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Four series of biforked or polycatenar mesogens derived from 3,4-dialkoxycinnamic or 3-(3',4'-dialkoxyphenyl)propanoic acids are described.These derivatives exhibit an extremly complex polymorphism including lamellar and columnar mesophases as well as nem
- Destrade, C.,Nguyen, H. T.,Alstermark, C.,Lindsten G.,Nillson, M.,Otterholm B.
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p. 265 - 280
(2007/10/02)
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- NOUVEAUX SCRISTAUX LIQUIDES COLONNAIRES : CATIONS HETEROAROMATIQUES AVEC SIX CHAINES ALCOXY
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The synthesis of 2,4,6-triarylpyrylium tetrafluoroborates with six alkoxy chains is described.They exhibit Dho mesophases for a large range of temperatures (ca. 200 deg C).The compounds with n=5,8 and 12 are mesomorphic at room temperature.
- Strzelecka, H.,Jallabert, C.,Veber, M.,Davidson, P.,Levelut, A. M.
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p. 395 - 402
(2007/10/02)
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- Investigations on the Formation of Liquid Crystals by Distyrylbenzenes with Alkoxy Chains
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The syntheses of 1,2-, 1,3- and 1,4-distyrylbenzenes with four or six dodecyloxy chains (1 -> 5a, b, c, 6 -> 13), and the structural conditions for the generation of liquid crystalline states are discussed. 5c forms a thermotropic smectic phase, which is
- Meier, Herbert,Prass, Ellen,Zerban, Georg,Kosteyn, Frank
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p. 889 - 896
(2007/10/02)
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- PREMIERS EXEMPLES DE SELS HETEROAROMATIQUES A QUATRE CHAINES PARAFFINIQUES POSSEDANT DES PROPRIETES MESOMORPHES COLONNAIRES
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Homologous series of diaryl-3,5 dithiolium-1,2 and diaryl-2,6 pyrylium salts, in which aryls possess two flexible alkoxy chains, were synthesized.With n>=8, dithiolium salts exhibit a columnar hexagonal mesophase.
- Strzelecka, H.,Jallabert, C.,Veber, M.,Davidson, P.,Levelut, A. M.,et al.
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p. 403 - 412
(2007/10/02)
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