342886-38-8Relevant academic research and scientific papers
Synthesis and characterization of α-cyanostilbene-based bent-core hexacatenar mesogens with different central groups
Jiang, Zonglin,Li, Nana,Liu, Xiaotong,Pang, Yida,Xiao, Yulong,Zuo, Rongzhou
supporting information, (2021/08/23)
Two series of bent-core hexacatenars containing a diphenyl ketone/diphenylmethylene malononitrile as central group and two α-cyanostilbene units as molecular arm were synthesized by Suzuki coupling and Knoevenagel reactions. The effect of the central groups on the liquid crystalline and photophysical behaviors was investigated in detail. POM, DSC and XRD results indicated that all the compounds could self-assemble into hexagonal columnar mesophases and diphenylmethylene malononitrile-based hexacatenars show much wider range of mesophase. The introduction of malononitrile unit into aromatic core could induce more distinct solvatochromic effect. Both series of hexacatenars show aggregation-induced emission enhancement (AIEE) behaviors and the fluorescence intensity is affected by the size of spherical aggregates in the aggregated state. Additionally, the maximum emission bands, fluorescence intensity and fluorescence color in condensed state showed obvious transition upon rising temperature.
Self-assembly of taper- and wedge-shaped maleimide derivatives: Synthesis and structure-property relationship
Vinayakumara,Kumar, Sandeep,Prasad, S. Krishna,Adhikari, Airody Vasudeva
, p. 765 - 772 (2019/04/25)
Herein, we describe design and synthesis of five new amphiphilic systems, viz. 10b-c and 11a-c composed of maleimide at the focal point and alkoxy phenyl ring at the periphery. Their self-assembling behaviour was examined systematically by varying the length of hydrophobic part and aromatic core segment. Evidently, on increasing the aromatic core length, maleimide based amphiphiles relatively emerge as two distinct molecular structures, i.e. wedge- and tapered-shaped. The mesomorphic studies of the two series reveal that, tapered-shaped maleimide derivatives assemble into a smectic A phase with an interesting phasmidic arrangement, whereas the wedge-shaped molecules exclusively form a prospective supramolecular hexagonal columnar mesophase through the intermolecular hydrogen-bonding via maleimide head group. These self-assembled materials could demonstrate high-sensitivity towards various external stimuli.
Supramolecular columnar self-assembly of wedge-shaped rhodanine based dyes: Synthesis and optoelectronic properties
Vinayakumara,Kumar, Sandeep,Adhikari, Airody Vasudeva
, p. 215 - 222 (2018/11/20)
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
Anhydrous proton conduction in self-assembled and disassembled ionic molecules
Kumar, Avneesh,Pisula, Wojciech,Sieber, Christoph,Klapper, Markus,Müllen, Klaus
, p. 6074 - 6084 (2018/04/12)
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
Optoelectronic exploration of novel non-symmetrical star-shaped discotic liquid crystals based on cyanopyridine
Vinayakumara,Swamynathan,Kumar, Sandeep,Adhikari, Airody Vasudeva
, p. 16999 - 17008 (2018/10/24)
A novel family of non-symmetrical star-shaped cyanopyridine based discotic liquid crystals (CPBz6, CPBz8 and CPBz12) was designed and synthesized, as potential luminescent materials for optoelectronic applications. The length of one of the arms in the design was systematically varied to determine the structure-property relationships. Evidently, all of the compounds exhibited a highly prospective ordered columnar mesomorphism stabilized at ambient temperature with advantageous very low isotropization temperatures. Furthermore, their photophysical characteristics were investigated in depth, both in solution and in the liquid crystal (LC) state. The discotics were found to be intense blue emitters with reasonably good quantum efficiency. Their dynamic intramolecular charge-transfer (ICT) behaviour was confirmed by steady-state absorption and fluorescence spectral analysis in varied solvent polarity. Furthermore, their electrochemical properties were studied from the combination of an experimental method and the theoretical simulations, which elucidated the low laying frontier molecular orbitals (FMOs) with a narrow energy band gap of ～2.0 eV. The resulted visually perceivable emission with favourable energy levels showcases their possible application in electronic display devices.
Wide-Range Columnar and Lamellar Photoluminescent Liquid-Crystalline Lanthanide Complexes with Mesogenic 4-Pyridone Derivatives
Chiriac, Laura F.,Pasuk, Iuliana,Secu, Mihail,Micutz, Marin,C?rcu, Viorel
, p. 13512 - 13522 (2018/09/06)
A series of liquid crystals with various lanthanide ions (EuIII, SmIII, and TbIII) was designed and prepared starting from the corresponding lanthanide nitrates and N-alkylated 4-pyridone derivatives bearing mesogenic 3,4,
Synthesis and photophysical investigations of C3-triazine based star-like conjugated molecules
Duraimurugan, Kumaraguru,Dhanamoorthy, Vaithialingam,Madhavan, Jagannathan,Siva, Ayyanar
, p. 164 - 171 (2018/04/20)
Here, we reported two different C3-triazine based star-like D-π-A compounds with a very good yield by Wittig-Horner reaction. Photophysical, aggregation enhanced emission and electrochemical properties were systematically studied. These compoun
Coumarin-based emissive hexacatenars: synthesis, 2D and 3D self-assembly and photodimerization
Xiao, Yulong,Tan, Xiaoping,Xing, Wei,Zhao, Kai,Zhang, Bei,Cheng, Xiaohong
supporting information, p. 10782 - 10792 (2018/10/25)
The first examples of unsymmetric coumarin polycatenar liquid crystals consisting of a coumarin central core with 1,2,3-triazole dendritic wings on both sides were synthesized via click reaction. Their properties were investigated using POM, DSC, XRD, SEM
s-Triazine-Based Functional Discotic Liquid Crystals: Synthesis, Mesomorphism and Photoluminescence
Veerabhadraswamy, B. N.,Dambal, Hashambi K.,Rao, D. S. Shankar,Yelamaggad, C. V.
, p. 2225 - 2237 (2016/08/27)
A new series of C3-symmetric, π-conjugated molecules was designed, synthesized and characterized. The materials were derived from electron-accepting s-triazine, appended covalently to electron-donating styrylbenzene arms, and were readily prepared in excellent yield with high purity by means of three-fold condensation of triphosphonate with n-alkoxybenzaldehydes under Horner–Wadsworth–Emmons reaction conditions. Examination of the phase transitional properties by several complementary techniques evidenced self-assembly into a hexagonal columnar phase, occurring over wide and reasonable thermal ranges. The photophysical properties were studied both in solution and in the fluid/frozen columnar states by UV/Vis absorption and photoluminescence spectroscopy. The emission spectra obtained as a function of the temperature rule out the breaking-up of larger columns and a non-radiative, thermally activated process. A study carried out on thin films of the glassy columnar state, which accounts for conserved fluorescence, defect-free orientation, and freezing ionic species, with the help of atomic force microscopy (AFM) images, suggested a homogeneous granular morphology comprising fibrillar structures. Dissimilarities in the surface morphology and birefringence of thin films of the solid and frozen columnar states were clearly shown by Raman spectroscopy. An electrochemical investigation revealed a LUMO energy of ?4.0 eV. Thus, the discotic motifs presented herein meet certain criteria of organic materials, which are essential for developing electronic devices.
Piezoflurochromism and Aggregation Induced Emission Properties of 9, 10-bis (trisalkoxystyryl) Anthracene Derivatives
Duraimurugan, Kumaraguru,Sivamani, Jayaraman,Sathiyaraj, Munusamy,Thiagarajan, Viruthachalam,Siva, Ayyanar
, p. 1211 - 1218 (2016/07/30)
We report the synthesis of trisalkoxy substituted 9, 10-bis styrylanthracene derivatives (C8-ant and C12-ant) by Heck coupling with very good yield and their photophysical properties. Both C8-ant and C12-ant exhibit aggregation induced emission (AIE), mec
