Lanthanide contraction effect on the crystal structures of 2D lanthanide coordination polymers based on 2-(trifluoromethyl)-1H-imidazole-4,5-dicarboxylic acid

作者：Cai, Song-Liang^*; Zhang, Kai; Wang, Sha; Wang, Zhen-Nan; Feng, Min-Xue; Li, Le-Bin; Fan, Jun; Zheng, Sheng-Run^*; Zhang, Wei-Guang

来源：Structural Chemistry, 2017, 28(3): 577-586.

DOI：10.1007/s11224-016-0817-7

• Lanthanide coordination polymer
• 1H-imidazole-4
• 5-Dicarboxylic acid
• Lanthanide contraction effect
• Crystal structure

A series of new two-dimensional (2D) lanthanide(III) coordination polymers, namely {[Ln(2)(mu (2)-HTFMIDC)(3)(DMA)(4)] center dot 2H(2)O} (n) [Ln = Pr (1); Nd (2); Sm (3); Eu (4); H3TFMIDC = 2-(trifluoromethyl)-1H-imidazole-4,5-dicarboxylic acid, DMA = N,N'-dimethylacetamide] for type I and {[Ln(2)(mu (2)-HTFMIDC)(3)(DMA)(2)(H2O)(2)] center dot DMA} (n) [Ln = Eu (5); Gd (6)] for type II, have been successfully prepared under solvothermal conditions and structurally characterized for the first time. Both two types of structures exhibit similar 2D honeycomb-like networks, which are constructed by the linkages of mu (2)-HTFMIDC2- bis-(bidentate) bridging ligands and Ln(III) metal centers. However, slightly different ABAB stacking fashions of the 2D layers and distinctly different hydrogen bonding interactions between the neighboring 2D layers are observed in crystal structures of type I and type II, which may be attributed to the lanthanide contraction effect. Meanwhile, the solid-state luminescent properties of 4 and 5 have been also investigated.

• 出版日期2017-6
• 单位华南师范大学