Etude de la photochimie d'une serie de composes tensioactifs diazoiques ou azoturo, dans des coches monomoleculaires a l'interface air-eau。L'irradiation d'α-diazocetones a longue chaine avec un rayonnement 紫外线导管 a une perterape d'azote。Les cetenes formes reagissent avec la phase support pour donner des acides carboxyliques et se dimerisent avec形成 de β-lactones, ent que sous-produits。Les α-azoturo-cetones
Thermotropic properties of monosubstituted ferrocene derivatives bearing bidentateN-benzoyl-N′-arylthiourea ligands—novel building blocks for heterometallic liquid crystal systems
Two series of phenylbenzylether and benzanilide based rod-like imidazolium bromides and their nonionic precursors, the 1-phenyl-1H-imidazoles have been synthesized and the influence of the number and length of the alkyl chain(s) and the structure of the linking group in the aromatic core (–CH2O–, –COO–, –CONH–) on their mesophase self-assembly in ionic liquid crystalline phases were studied by POM, DSC and XRD. Upon decreasing the length of the N-terminal chain or by enlarging the number and length of the C-terminal chains, the sequence smectic (SmA)–hexagonal columnar (Colhex)–micellar cubic (CubI/Pm3n) was found for the ether based imidazolium salts; while only SmA and Colhex phases were observed for the related amides. The influence of the polarity of the central linkages, namely –CH2O– and –CONH–, on the mesophase structure and stability is discussed and compared with related –COO– connected ILC.
By using aryl‐amination chemistry, a series of rodlike 1‐phenyl‐1H‐imidazole‐based liquidcrystals (LCs) and related imidazolium‐based ionicliquidcrystals (ILCs) has been prepared. The number and length of the C‐terminal chains (at the noncharged end of the rodlike core) and the length of the N‐terminal chain (on the imidazolium unit in the ILCs) were modified and the influence of these structural
通过使用芳基胺化化学方法,制备了一系列棒状的1-苯基-1 H-咪唑基液晶(LC)和相关的咪唑基离子液晶(ILC)。修改了C端链的数量和长度(在棒状核的不带电荷的末端)和N端链的长度(在ILC中的咪唑单元上),并且这些结构参数对模式的影响通过偏光显微镜,差示扫描量热法和X射线衍射研究了LC相中自组装的机理。对于单链咪唑衍生物,向列相(N)和双层SmA 2虽然发现了液相,但随着烷基链数量的增加,液相色谱丢失了。对于相关的咪唑鎓盐,LC相会随着C末端链的数量和长度的增加而得以保留,并且在该系列中,它导致了SmA–柱状(Col)–胶束立方(Cub I / Pm 3 n)的相序。N端链的延伸给出了相反的序列。短的N端链更倾向于将端粒的端到端堆积,其中这些链与C端链是分开的。N末端链的延长导致N末端链和C末端链的混合,并伴有芳族核的完全插入。在近晶阶段,这会导致从双层(SmA 2)到单层近晶(SmA)
Mesomorphism dependence on tail group
作者:B. B. Jain、R. B. Patel
DOI:10.1080/15421406.2016.1146932
日期:2016.5.2
enantiotropically nematogenic without exhibition of smectic property. Transition temperatures and the textures of the nematic phase were determined by an optical polarizing microscopy, equipped with a heating stage. Texture of a nematic phase are threaded or schlieren. The Spectral and analytical data confirms the molecular structures of homologs. Thermal stability for nematic is 123.0°C and its mesogenicphaselength
Fluids with spontaneous helical structures formed by achiral low molecular mass molecules is a newly emerging field with great application potential. Here, we explore the chemical mechanisms of the helix formation by systematically modifying the structure of a bent 4-cyanoresorcinol unit functionalized with two different phenyl benzoate based aromatic rods and terminated with two alkyl chains of variable
1,1?-Disubstituted Ferrocene-Containing Thermotropic Liquid Crystals of structure [Fe{(?5-C5H4)COOC6H4XC6H4OCnH2n+1}2] (X ? OOC or COO). Influence of the orientation of the central ester function on the mesogenic properties
作者:Robert Deschenaux、Jean-Lue Marendaz、Julio Santiago
DOI:10.1002/hlca.19930760210
日期:1993.3.24
The two series I and II of 1,1′ -disubstituted ferrocenes which differ by the direction of the esterfunction included in the rigid organic part were synthesized and their liquidcrystalproperties examined. These latter were found to be strongly dependent on the orientation of the connecting ester group and on the alkyl chain length.