A Family of Three-Dimensional Lanthanide-Zinc Heterometal鈥揙rganic Frameworks from 4,5-Imidazoledicarboxylate and Oxalate

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• 作者：Zhi-Gang Gu ; Hua-Cai Fang ; Pei-Yi Yin ; Long Tong ; Yin Ying ; She-Jun Hu ; Wei-Shan Li ; Yue-Peng Cai
• 刊名：Crystal Growth & Design
• 出版年：2011
• 出版时间：June 1, 2011
• 年：2011
• 卷：11
• 期：6
• 页码：2220-2227
• 全文大小：1109K
• 年卷期：v.11,no.6(June 1, 2011)
• ISSN：1528-7505

文摘

A family of lanthanide-zinc coordination polymers with two different types of three-dimensional (3-D) frameworks based on 4,5-imidazoledicarboxylic acid and oxalic acid, namely, {[Ln₂(H₂O)₂Zn₄(H₂O)₄(ImDC)₄(ox)]路6H₂O}_n (Ln = La (1), Nd (2), Sm (3), Eu (4), and H₃ImDC = 4,5-imidazoledicarboxylic acid, H₂ox = oxalic acid) and {[Ln₄(H₂O)₄Zn₄(H₂O)₄(ImDC)₄(ox)]路2CH₃OH路2H₂O}_n (Ln = Eu (4鈥?, Gd (5), Dy (6), Ho (7), Er (8), Yb (9), and Lu (10)), were successfully constructed under certain conditions and characterized by elemental analysis, IR, thermogravimetric (TG), and single-crystal X-ray diffraction. The results reveal that compounds 1鈥?b>4 (I structure) are isomorphous 3-D coordination frameworks containing two-dimensional (2-D) [Zn₂(ImDC)₂] layers and one-dimensional (1-D) Ln₂(渭₂-O)₂(ox) sine wave-like chains with 1-D square channels, while 4鈥?/b>鈥?b>10 coordination polymers (II structure) are also isomorphous and feature 3-D pillar-layered coordination frameworks constructed from 2-D Zn-carboxylate [Zn₂(ImDC)₂] layers and Ln₂(ox) pillars with 1-D flat channels. The structural variation from I to II with the europium ion as a critical point, in which two types of europium complexes 4 and 4鈥?can reversibly transform into each other, may be attributed to the lanthanide contraction effect. Meanwhile, the adsorption and photoluminescent properties of the partial compounds are also investigated.