Homochiral coordination polymers constructed from aminocarboxylate derivates: Effect of bipyridine on the amidation reaction
作者:Jianshan Chen、Tianlu Sheng、Shengmin Hu、Shengchang Xiang、Ruibiao Fu、Qilong Zhu、Xintao Wu
DOI:10.1016/j.jssc.2012.04.025
日期:2012.8
Using aminocarboxylate derivates (S)-N-(4-cyanobenzoic)-glutamic acid (denoted as cbg, la) and (S)-N-(4-nitrobenzoic)-glutamic acid (denoted as nbg, 1b) as chiral ligands, five new homochiral coordination polymers formulated as [Cu(cbg)(H2O)(2)](n) (3), [Cu(cbop)(2)(4,4'-bipy)(H2O)](n) (4) (cbop=(S)-N-(4-cyanobenzoic)-5-oxoproline, 4,4'-bipy=4,4'-bipyridine), [Cu(nbop)(2)(4,4'-bipy)] center dot 4H(2)O}(n) (5) (nbop=(S)-N-(4-nitrobenzoic)-5-oxoproline), [Cd(nbop)(2)(4,4'-bipy)] center dot 2H(2)O}(n) (6), and [Ni(nbop)(2)(4,4'-bipy)(H2O)(2)](n) (7) have been hydrothermally synthesized and structurally characterized. Single-crystal X-ray diffraction study reveals that the original chirality of aminocarboxylate derivates is maintained in all these complexes. Complexes 3, 4, and 7 are one-dimensional infinite chain coordination polymers, while complexes 5 and 6 possess two-dimensional network structures. In situ cyclization of 1a and 1b was taken place in the formation of complexes 4-7, which may be due to the competition of 4,4'-bipyridine with chiral ligands during the coordination process. Preliminary optical behavior investigation indicates that ligands 1a, 1b, and complexes 6, 7 are nonlinear optical active. (C) 2012 Elsevier Inc. All rights reserved.