- Investigation of iron(III) ionic structural complexes for seebeck coefficient enhancement using variation of ligand lengths with extended Π-conjugated bipyridyl ligands
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Five new octahedral spin-crossover magnetic complexes with general formulae, [Fe(LCn)3](BF4)3, where L = ligand, and n = 8, 10, 12, 14, 16, were synthesized and characterized. The influence of different ligand lengths on t
- Ibrahim, N.M.J. Nik,Said, S. Mohd,Mainal,Sabri, M.F. Mohd,Abdullah,Hasnan, M.M.I. Megat,Amin, N.A.A. Mohd,Salleh, M.F. Mohd
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Read Online
- Synthesis, characterization and electrochemistry of polycyclic fused aromatic pyrroles and their conjugated polymers
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Polycyclic fused aromatic pyrrole-based compounds, benzodipyrrole, naphthobipyrrole and their alkylated derivatives, were synthesized and studied electrochemically. Amongst these, naphthobipyrrole having a tetracyclic fused aromatic structure was electrochemically polymerized to give the homopolymer of naphthobipyrrole, poly(naphthobipyrrole), indicating good reactivity of α,α′-pyrrolic positions towards oxidative coupling. As a strategic approach towards the synthesis of copolymers, naphthobipyrrole was copolymerized with arylaldehyde to afford poly(arylmethylene naphthobipyrrole) by exploring the reactivity of β,β′-pyrrolic positions. Moreover, optical and electrochemical studies showed that the copolymer possessed a low optical bandgap and an elevated HOMO level. The scan rate dependent cyclic voltammetry studies of the copolymer film showed the formation of an electroactive material.
- Bhanvadia, Viraj J.,Mankad, Yash J.,Patel, Arun L.,Zade, Sanjio S.
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Read Online
- Molecular design strategies for spin-crossover (SCO) metal complexes (Fe(II) and Co(II)) for thermoelectricity
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TEC are developing technology to generate electricity from thermal energy. It causes current flow when redox solution disturbs the electrochemical potential equilibrium between the electrolyte and two inert electrodes upon application of a temperature gra
- Abdullah, N.,Che Hassan, H.,Mainal, A.,Megat Hasnan, M. M. I.,Mohd Sabri, M. F.,Mohd Salleh, M. F.,Nik Ibrahim, N. M. J.,Said, S. Mohd,Wan Mohd Mahiyiddin, W. A.
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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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- 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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supporting information
p. 20610 - 20619
(2020/12/28)
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- Anticancer, antimicrobial activities of quinoline based hydrazone analogues: Synthesis, characterization and molecular docking
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Based on the biologically active heterocycle quinoline, a series (18a-p) of quinoline hydrazone analogues were prepared, starting from 6-bromo/6-chloro-2-methyl-quinolin-4-yl-hydrazines. For all the newly synthesized compounds cytotoxic activities were carried out at the National Cancer Institute (NCI), USA, against full NCI 60 human cancer cell lines. Amongst all the tested compounds, nine compounds (18b, 18d, 18e, 18f, 18g, 18h, 18i, 18j, 18l) exhibited important anti-proliferative activity at 10 μM concentration and were further screened at 10-fold dilutions of five different concentrations (0.01, 0.1, 1, 10 and 100 μM) with GI50 values ranging from 0.33 to 4.87 μM and LC50 values ranging from 4.67 μM to >100j μM. Further, the mean values of GI50, TGI and LC50 of the most potent compound 18j were compared with the clinically used anticancer agents bendamustine and chlorambucil, revealed that the quinolyl hydrazones holds promise as a potential anticancer agents. Further all the newly prepared compounds were screened for their antimicrobial activity. All the quinolyl hydrazones displayed good to excellent antimicrobial activity with MIC values ranging from 6.25 to 100 μg/mL against the tested pathogenic strains. Molecular docking of the synthesized compounds into the active binding site of human DNA topoisomerase I (htopoI) was carried out to predict the binding mode to the DNA topoisomerase I inhibitors. Hopefully in future, compounds based on quinoline core could be used as a lead compounds for designing new anticancer agents.
- Katariya, Kanubhai D,Shah, Shailesh R.,Reddy, Dushyanth
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supporting information
(2019/11/26)
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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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- 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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- 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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- 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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- 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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- 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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supporting information
p. 495 - 500
(2014/01/06)
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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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- 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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p. 1496 - 1508
(2014/12/10)
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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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- 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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- 2,4-Diaminopyrimidines as inhibitors of leishmanial and trypanosomal dihydrofolate reductase
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This paper describes the synthesis of 4′-substituted and 3′,4′-disubstituted 5-benzyl-2,4-diaminopyrimidines as selective inhibitors of leishmanial and trypanosomal dihydrofolate reductase. Compounds were then assayed against the recombinant parasite and human enzymes. Some of the compounds showed good activity. They were also tested against the intact parasites using in vitro assays. Good activity was found against Trypanosoma cruzi, moderate activity against Trypanosoma brucei and Leishmania donovani. Molecular modeling was undertaken to explain the results. The leishmanial enzyme was found to have a more extensive lipophilic binding region in the active site than the human enzyme. Compounds which bound within the pocket showed the highest selectivity.
- Pez, Didier,Leal, Isabel,Zuccotto, Fabio,Boussard, Cyrille,Brun, Reto,Croft, Simon L.,Yardley, Vanessa,Ruiz Perez, Luis M.,Gonzalez Pacanowska, Dolores,Gilbert, Ian H.
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p. 4693 - 4711
(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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- 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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- Photopolymerization of carbohydrate-based discotic mesogens. Synthesis and phase properties of 1,2,3,4,6-penta-O-(trans-3,4-dialkoxycinnamoyl)-(D)-glucopyranoses and their oligomers
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The neat phase properties of the α and β anomers of 1,2,3,4,6-penta-O-(trans-3,4-dialkoxycinnamoyl)-(D)-glucopyranose (nαGP and nβGP; n, the number of carbon atoms in the alkyl chains, is 6-8, 10, and 14) have been investigated by optical microscopy, diff
- Mukkamala, Ravindranath,Burns Jr., Charles L.,Catchings III, Robert M.,Weiss, Richard G.
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p. 9498 - 9508
(2007/10/03)
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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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- 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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