Chirality and absolute helicity in a pair of enantiomeric amino acid derivatives and their complexes: structures, chiroptical, and photoluminescent properties
作者:Xinfa Li、Huajun Zhao、Qihua Zeng
DOI:10.1039/c3ce27028a
日期:——
coordination helices are further tied up by hydrogen bonds, forming 1D triple-stranded supramolecular helices extending along the same direction. Interestingly, 3L and 3D also show supramolecular helicities on the directions of b- and c-axes. The chiralities and absolute helicities of these complexes are controlled by the chiralities of ligands. In addition, the solid-state circular dichroism (CD) and photoluminescent
通过对映纯的一步取代反应,合成了一对对映体氨基酸衍生物[ L -H 2 cala(1L)和D -H 2 cala(1D),H 2 cal = N-(4-羧基苄基)-丙氨酸]。L-(或D-)丙氨酸4-(溴甲基)苯甲酸。1L和1D与二价Cu 2+和Cd 2+离子的自组装水制备了两对对映体,分别配制为[Cu(L -cala)(H 2 O)] n · n(H 2 O)(2L),[Cu(D -cala)(H 2 O)] n · n(H 2 O)(2D),[Cd(L -Hcala)2(H 2 O)2 ] n · n(H 2 O)(3L)和[Cd(D -Hcala)2(H 2 O)2 ] n · n(H 2 O)(3D)。X射线衍射分析显示1L和1D是氢键键合的二维(2D)超分子,其中包含与晶体学b轴平行的一维(1D)单链超分子螺旋。2L和2D是沿c轴方向排列的一维单链配位螺旋。它们通过螺旋间氢键进一步