氨基环丙烯离子作为有机催化剂和氧化还原活性聚合物引起了广泛关注。然而,两亲性氨基环丙烯离子的自组装仍然具有挑战性。第一个基于氨基环丙烯离子的三角离子液晶已经开发出来。差示扫描量热法、偏光光学显微镜和 X 射线衍射提供了对这些液晶独特的自组装和纳米偏析的深入了解。虽然小头基与线性对烷氧基苯基单元的组合导致双层型近晶中间相,但楔形单元导致柱状中间相。当氨基环丙烯头部基团的尺寸和多亲性增加时,形成层状相。
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
Thermotropic Liquid-Crystalline and Light-Emitting Properties of Bis(4-aalkoxyphenyl) Viologen Bis(triflimide) Salts
作者:Pradip K. Bhowmik、Muhammed Kareem M. Al-Karawi、Shane T. Killarney、Erenz J. Dizon、Anthony Chang、Jongin Kim、Si L. Chen、Ronald Carlo G. Principe、Andy Ho、Haesook Han、Hari D. Mandal、Raymond G. Cortez、Bryan Gutierrez、Klarissa Mendez、Lewis Sharpnack、Deña M. Agra-Kooijman、Michael R. Fisch、Satyendra Kumar
DOI:10.3390/molecules25102435
日期:——
metathesis reaction of respective bis(4-alkoxyphenyl) viologen dichloride salts, which were in turn prepared from the reaction of Zinckesalt with the corresponding 4-n-alkoxyanilines, with lithium triflimide in methanol. Their chemicalstructures were characterized by 1H and 13C nuclear magnetic resonance spectra and elemental analysis. Their thermotropic liquid-crystalline (LC) properties were examined
由Zincke盐反应制得的各双(4-烷氧基苯基)紫精二氯化物盐的复分解反应合成了一系列具有不同烷氧基链的双(4-烷氧基苯基)紫精双(三氟甲酰亚胺)盐与相应的 4-n-烷氧基苯胺,与三氟亚胺锂的甲醇溶液。它们的化学结构通过 1H 和 13C 核磁共振光谱和元素分析来表征。通过差示扫描量热法、偏振光学显微镜和变温 X 射线衍射检查了它们的热致液晶 (LC) 特性。具有短长度烷氧基链的盐具有晶体到液体的转变。中等长度烷氧基链的盐表现出晶体到近晶 A (SmA) 转变 Tms 和 SmA 到各向同性转变 Tis。具有较长烷氧基链的那些具有相对较低的 Tms,它们形成在高温下持续分解的 SmA 相。正如预期的那样,它们都在 330-370°C 的温度范围内具有出色的热稳定性。它们在甲醇中的发光特性也包括在内。
Benzene ring containing cationic gemini surfactants: Synthesis, surface properties and antibacterial activity
a pronounced effect on the aggregation behavior of surfactants molecules. This was confirmed by the average surfaces occupied by these molecules at the water–air interface calculated from the Gibbs equation. The size of the aggregates was measured by employing dynamic light scattering technique. The antimicrobial activity of investigated surfactants was evaluated against three microorganisms: Staphylococcus
通式为C n H 2n + 1 -Ph-NHCOCH 2 N +(CH 3)2-(CH 2)s -N +(CH 3)2 CH 2 CONH-Ph-C n H的新型季铵双子表面活性剂通过基于N,N,N ',N的季铵化的有效合成途径合成了2n +1(n = 8、10、12、14、16和s = 2、4、6)′-四甲基亚烷基二胺与2-溴-N-(4-(烷氧基)苯基)乙酰胺。通过表面张力,电导率和动态光散射(DLS)测量研究了它们的表面性能。研究表明,在疏水尾部掺入苯环会促进胶束形成,与带有烷基疏水链的类似双子星相比,胶束的cmc值较小,在0.21-0.009 mM范围内。间隔基和疏水链的长度对表面活性剂分子的聚集行为具有显着影响。由吉布斯方程计算得出的这些分子在水-空气界面处所占据的平均表面可以证实这一点。聚集体的尺寸通过采用动态光散射技术来测量。金黄色葡萄球菌,大肠杆菌和白色念珠菌。
Supramolecularly Engineered Perylene Bisimide Assemblies Exhibiting Thermal Transition from Columnar to Multilamellar Structures
photoconductivity was observed by the flash-photolysis time-resolvedmicrowaveconductivity (FP-TRMC) measurements upon converting the Col(h) structure to the Lam structure. Transient absorption spectroscopy revealed that electron transfer from electron-donating alkoxyphenyl groups of melamine components to electron-deficient PBI moieties takes place, resulting in a higher probability of charge carrier generation
Designer Ionic Liquid Crystals Based on Congruently Shaped Guanidinium Sulfonates
作者:Martin Butschies、Wolfgang Frey、Sabine Laschat
DOI:10.1002/chem.201101925
日期:2012.3.5
determine the influence of congruently shaped anions, in comparison with their spherical counterparts, on mesophase behaviour, which was investigated by differential scanning calorimetry (DSC), polarising optical microscopy (POM) and X‐ray diffraction (XRD). All the liquid crystalline salts exhibit smectic A mesophases with strongly interdigitated bilayer structures. The guanidinium sulfonate ion pairs