Two kinds of glutamaic acid-based coumarin derivatives show a quite different trend against gelation in organic solvents in terms of inter- or intramolecular hydrogen bonds involved. It has been found out that addition of the valinate structure into the coumarine derivative could improve its gelation ability.
Pyrene-doped L-glutamide-based lipidic derivatives with different alkyl lengths (C-n-g-Pyr; n = 4, 8 and 12) were newly synthesized. All of the C-n-g-Pyr dissolved and showed thermotopically and lyotropically-induced excimer formations accompanied by induction of the positive Cotton effect in their CD spectra, indicating chirally ordered stacking. However, when C-4-g-Pyr and C-12-g-Pyr were mixed in a certain molar ratio, an unusual CD pattern from positive to negative ones was observed. In this study, energy transfer efficiency was investigated in a binary system of C-n-g-Pyr with C-12-g-TPP. The results revealed that simple modification of the alkyl length of C-n-g-Pyr enables enhancement of the energy transfer efficiency with C-12-g-TPP. (C) 2011 Elsevier Ltd. All rights reserved.
Supramolecular receptors from α-amino acid-derived lipids
作者:Hiroshi Hachisako、Yutaka Murata、Hirotaka Ihara
DOI:10.1039/a903956b
日期:——
were investigated. The L- or D-glutamic acid-derived lipids with glutaric acid headgroups aggregated to form specific hydrophobiccavities which exhibited inclusion ability for the styryl dyes mainly based on the planarity recognition. The formation of such specific hydrophobiccavities can be achieved not only by introducing amide groups capable of complementary hydrogen bondings between neighbouring
制备了衍生自L-,D-,DL-谷氨酸,L-天冬氨酸,L-赖氨酸,L-鸟氨酸和L -2,4-二氨基丁酸的阴离子脂质,以及与结构相关的溶剂化阳离子苯乙烯基苯乙烯的方法研究了将染料掺入这些脂质聚集体中的方法。的大号-或d具有戊二酸头基的β-谷氨酸衍生的脂质聚集形成特定的疏水腔,其主要基于平面性识别而表现出对苯乙烯基染料的包涵能力。这样的特定疏水腔的形成不仅可以通过在聚集体中引入能够与相邻脂质之间互补的氢键结合的酰胺基,而且可以通过将适当的间隔基亚甲基引入例如戊二酸酯头基来实现。还发现氨基酸残基的侧链亚甲基在特定的疏水腔以及间隔基亚甲基的形成中起重要作用。还为适当设计的L-赖氨酸和L形成了此类腔-鸟氨酸来源的脂质。这些结果表明,特异性掺入不是谷氨酸来源的脂质所特有的,而是来自适当设计的L-氨基酸来源的脂质的聚集体的普遍现象。在组装的方式的差异大号之间谷氨酸残基大号- , - d -异构体,和DL