The π–π interactions enhanced in salicylaldimines and salicylaldazines
摘要:
Four new series of salicylaldazines 1 and salicylaldimines 2-4 were prepared, characterized and their mesomorphic properties were studied. The structures of all compounds were identified and confirmed by spectroscopic techniques such as H-1, C-13 NMR, MS and elemental analysis. Three single crystallographic structures of compounds la (n=3, 6) and 2 (n=3) were determined by X-ray analysis in order to correlate the molecular structures with the formation of mesophases. Crystallographic data indicated that the better mesomorphic properties might be controlled by CH-pi, pi-pi or/and H-bonds in such system. Except for crystalline compounds 4, all other compounds 1-3 showed mesomorphic behavior of nematic, smectic A or/and smectic C phases, which were characterized by differential scanning calorimetry, optical polarizing microscope and X-ray diffraction experiments. All compounds 1-4 showed yellow green photoluminescence in THF occurred at 519-521 nm. (C) 2015 Elsevier Ltd. All rights reserved.
Observation of polar order and thermochromic behaviour in a chiral bent-core system exhibiting exotic mesophases due to superstructural frustration
作者:Vidhika Punjani、Golam Mohiuddin、Supreet Kaur、Raj Kumar Khan、Sharmistha Ghosh、Santanu Kumar Pal
DOI:10.1039/c7cc08885j
日期:——
First examples of smart bent-core materials that exhibited frustrated structures with high polar order and thermochromism.
首次展示了具有高极性序和热致变色性质的智能弯曲核材料的示例。
Induction of Mesomorphism through Supramolecular Assembly in Metal Coordination Compounds of “salphen”‐Type Schiff Bases: Photoluminescence and Solvatochromism
作者:Sutapa Chakraborty、Paritosh Mondal、S. Krishna Prasad、D. S. Shankar Rao、Chira R. Bhattacharjee
DOI:10.1002/ejic.201600513
日期:2016.10
variable-temperature powder X-ray diffraction (XRD). The Schiffbaseligands are non-mesomorphic; however, coordination to NiII and ZnII ions induces columnar mesomorphism, this being stable down to room temperature in the latter case. Interestingly, the complexes of CuII and VOIV did not show any mesomorphism. The free ligands and the ZnII complexes are luminescent both in the condensed state and in solution
Polarization effect in luminescent mesogenic BF2 complexes derived from heterocyclic benzothiazoles
作者:Yuan−Chun Hsu、Chun−Yang Wang、Pei−Chi Hsiao、Yi-Hong Cai、Gene−Hsiang Lee、Chung K. Lai
DOI:10.1016/j.molliq.2019.111660
日期:2020.1
Two series of benzo(thia)xazoles 1–2 and one series of boron difluoride complexes 2-BF2 derived from benzothiazoles2 were reported, and their mesomorphic and opticalproperties were investigated. The crystal and molecular structures of compound 2 and 2-BF2 (all n = 8) were determined by means of X-ray structural analysis, and both crystallize in the triclinic P-1 and monoclinic P21/c. The geometry
Liquid crystalline properties of bis(salicylaldiminato)copper(II) complexes: the first columnar discotics derived from salicylaldimine Schiff bases
作者:Chung K. Lai、Chung-hsiung Chang、Chun-hsien Tsai
DOI:10.1039/a707091h
日期:——
The synthesis and mesomorphic properties of a homologous series ofN-(2-hydroxy-4-n-alkoxybenzylidene)-3′,4′-di-n-alkoxylanilines and their copper(ii) complexes bis[(N-3′,4′-dialkoxyphenyl)-4-n-alkoxylsalicylaldiminato]copper(ii) are reported. The disc-like copper complexes exhibited columnar hexagonal disordered mesophases, which were characterized by DSC analysis and optical polarized microscopy. The structure of the mesophases was confirmed by X-ray powder diffraction (XRD). The mesomorphic properties for these copper complexes were compared with other similar metallomesogenic bis(salicylaldiminato)copper(ii) complexes in terms of molecular structural differences.
Zinc(II)-salphen complexes bearing long alkoxy side arms: Synthesis, solvent dependent aggregation, and spacer group substituent effect on mesomorphism and photophysical property
作者:Sutapa Chakraborty、Paritosh Mondal、S. Krishna Prasad、D.S. Shankar Rao、Chira R. Bhattacharjee
DOI:10.1016/j.molliq.2017.09.078
日期:2017.11
substitution at the ligand's spacer; different variant of columnar phases were exhibited by the ligands and the zinc(II) complexes. The ligands and the complexes displayed fluorescence at ambient temperature in the blue-green region with moderate to low intensity. Density functional theory (DFT) calculations indicated a distorted square-planar geometry around the zinc(II) center in the complexes. The coordinative
两个新的卤素取代的“ salphen”型席夫碱配体[ZnL]的半圆盘形锌(II)配合物;H 2 L = [ N,N'-双(4-n-烷氧基水杨基)-4-氟/溴-1,2-二氨基苯](n = 12、14、16)已合成,并研究了它们的同构和光物理性质。配体和锌(II)配合物在更宽的温度范围内显示出柱状中间相。取决于配体间隔基上的卤素取代基;配体和锌(II)配合物表现出不同的柱状相变体。配体和配合物在环境温度下在蓝绿色区域中以中等至低强度显示荧光。密度泛函理论(DFT)计算表明,配合物中锌(II)中心周围的方形几何结构变形。这些配合物中锌(II)中心的配位不饱和度会导致在非配位溶剂的稀溶液中产生有趣的聚集性质。但是,在协调溶剂时,