Crystal Structures and Spectroscopic Properties of Metal–Organic Frameworks Based on Rigid Ligands with Flexible Functional Groups
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- 作者：Chuanlei Zhang ; Mingdao Zhang ; Ling Qin ; Hegen Zheng
- 刊名：Crystal Growth & Design
- 出版年：2014
- 出版时间：February 5, 2014
- 年：2014
- 卷：14
- 期：2
- 页码：491-499
- 全文大小：553K
- ISSN：1528-7505
文摘
Two rigid linear ligands with alkoxy functional groups (L1 = 4,4鈥?(2,5-dimethoxy-1,4-phenylene) dipyridine; L2 = 4,4鈥?(2,5-diethoxy-1,4-phenylene) dipyridine) incorporating carboxyl-containing auxiliary ligands (isophthalic acid = H2IPA; terephthalic acid = H2TPA; biphenyl-4,4鈥?dicarboxylate = H2BPDC) have been adopted to build a series of complexes with M(II) (M = Zn, Co, Cd) under solvothermal conditions. The formula of these complexes are {[Zn(L1)(IPA)]}n (1), {[Zn(L1)(TPA)]路DMF}n (2), {[Co(L1)(TPA)(H2O)2]路2DMF}n (3), {[Cd(L1)(TPA)(H2O)2]路2DMF}n (4), and {[Co(L2)(BPDC)]路0.5H2O}n (5). Five complexes have been characterized by elemental analysis, infrared spectroscopy, powder X-ray diffraction and thermogravimetry measurements. Topological analyses reveal that complex 2 is a 6-connected pcu net with point symbol {412路63}, while complex 5 is a 6-connected rob net with point symbol {48路68路8}, the other complexes 1, 3, and 4 can be simplified as 4-connected sql nets with point symbol {44.62}. Complexes 1, 3, and 4 are 2D layer motifs, 2 and 5 are both 2-fold interpenetrating 3D frameworks. The optical absorption spectra of 3 and 5 indicate the nature of semiconductivity. The strong fluorescence emissions and long emission lifetimes of 1, 2, and 4 display that they are promising phosphorescent materials.