Long-Range Chiral Induction in Chemical Systems with Helical Organization. Promesogenic Monomers in the Formation of Poly(isocyanide)s and in the Organization of Liquid Crystals
作者:David B. Amabilino、Elena Ramos、José-Luis Serrano、Teresa Sierra、Jaume Veciana
DOI:10.1021/ja980474m
日期:1998.9.1
of the cholestericphases, as well as to the helical senses of chiral smectic C phases, induced by the monomers in nematic and smectic C phases, respectively. Both relate to the odd−even rules for chiral sense changes in liquidcrystallinephases. The role of noncovalent interactions in the polymerization has been proven by performing the reactions at various concentrations and in different solventsthe
报道了从手性前显微单体衍生的光学活性聚(异氰化物)的制备。值得注意的是,单体中的立体碳原子能够将其手性“信息”传递到距离它至少 14 个原子(约 16 A)的增长的聚合物主链上。这些构象刚性聚合物中的螺旋感应与胆甾相的螺旋感应以及手性近晶 C 相的螺旋感应进行比较,分别由向列和近晶 C 相中的单体诱导。两者都与液晶相中手性意义变化的奇偶规则有关。
V-Shaped SmC* switching FLC compounds
作者:V. Bezborodov、V. Lapanik、G. Sasnouski、W. Haase
DOI:10.1080/15421400490435062
日期:2004.1
Continuing our interest in the ferroelectric liquid crystalline materials for display applications we have synthesized new chiral aryl esters of 4-(6-alkylcyclohex-2-enonoyl-3)benzoic acids and 3,6-diarylcyclohex-2-enones, investigated their mesomorphic properties, physical and electro-optical properties of the FLC compositions on their base.
US5462695A
申请人:——
公开号:US5462695A
公开(公告)日:1995-10-31
Laterally Azo-Bridged H-Shaped Ferroelectric Dimesogens for Second-Order Nonlinear Optics: Ferroelectricity and Second Harmonic Generation
Two classes of laterally azo-bridged H-shaped ferroelectricliquidcrystals (FLCs), incorporating azobenzene and dispersered1 (DR-1) chromophoresalong the FLC polar axes, were synthesized and characterized by polarized light microscopy, differential scanning calorimetry, 2D X-ray diffraction analysis, and electro-optical investigations. They represent the first H-shaped FLC materials exhibiting
合成了两类横向偶氮桥连 H 型铁电液晶 (FLC),沿 FLC 极轴包含偶氮苯和分散红 1 (DR-1) 发色团,并通过偏光显微镜、差示扫描量热法、2D X 表征射线衍射分析和光电研究。它们代表了第一种表现出基态、热力学稳定的对映 SmC* 相,即基态铁电性的 H 形 FLC 材料。在 1064 nm 入射波长下对一种结合了 DR-1 发色团的化合物进行二次谐波生成测量,得出非线性系数 d(22) = 17 pm/V,这是迄今为止报道的最大非线性光学系数,用于 calamitic FLC。该值使 FLC 在非线性光学中的可行应用成为可能。
Reversible and irreversible conformational changes in poly(isocyanide)s: a remote stereoelectronic effect
作者:David B. Amabilino、Jos�-Luis Serrano、Jaume Veciana
DOI:10.1039/b411449c
日期:——
Poly(isocyanide)s prepared by diastereoselective polymerisation of two chiral monomers, which differ only in the presence of a nitro-group adjacent to the stereogenic group, exhibit long range chiral induction, but a surprising influence of a remote substituent on the conformation and stability of the secondary structure in the macromolecules.