Homochiral Layered Coordination Polymers from Chiral N-Carbamylglutamate and Achiral Flexible Bis(pyridine) Ligands: Syntheses, Crystal Structures, and Properties

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• 作者：Yuehong Wen ; Tianlu Sheng ; Zhenzhen Xue ; Zhihao Sun ; Yanlong Wang ; Shengmin Hu ; Yihui Huang ; Jie Li ; Xintao Wu
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：December 3, 2014
• 年：2014
• 卷：14
• 期：12
• 页码：6230-6238
• 全文大小：596K
• ISSN：1528-7505

文摘

Four new homochiral two-dimensional (2D) coordination polymers, namely, [Zn₂L(NCG)₂(H₂O)₂路4H₂O]_n (1), [Zn(bpe)(NCG)路3H₂O]_n (2), [Zn(bpe)(NCG)(NaNO₃)_0.5H₂O]_n (3), and [Zn(bpp)(NCG)路3.5H₂O]_n (4) (NCG = N-carbamylglutamate, L = 1,2-bis(4鈥?pyridylmethylamino)ethane, bpe = 1,2-bis(4-pyridyl)ethane, bpp = 1,3-bis(4-pyridyl)propane), have been prepared under mild conditions. The structures of CPs 1鈥?b>4 were determined by single-crystal X-ray diffraction analysis. Complexes 1 and 2 display novel homochiral wavelike networks, with adjacent layers stacked in an AA type arrangement. Complex 3 shows an interesting 2D double-layered framework, which is further connected to form a 3D supermolecular structure through hydrogen bonding and aromatic 蟺鈥撓€ stacking interactions. The 2D structure of complex 4 contains two uncommon helical chains of bpp and NCG, with two flexures in each single strand. Different layers are stacked in an offset ABAB fashion. The mixed-ligand strategy, cooperation of a chiral and an achiral ligand, is applied to prepare the homochiral neutral layered CPs. Complexes 1鈥?b>4 display second harmonic generation efficiencies, which are approximately 0.7, 0.9, 0.4, and 0.6 times as much as that of urea powder. In addition, the photoluminescence of all complexes has also been investigated in the solid state.