pH- and metal-dependent structural diversity from mononuclear to two-dimensional polymers based on a flexible tricarboxylate ligand

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• 作者：Chengjuan Li^a ; Yanqiang Peng^a ; Suna Wang^a ; ^b ; ^{wangsuna@lcu.edu.cn"" rel=""nofollow} ; Xianxi Zhang^a ; Yizhi Li^b ; Jianmin Dou^a ; ^{jmdou@lcu.edu.cn"" rel=""nofollow} ; Dacheng Li^a
• 关键词：Crystal engineering ; Flexible tricarboxylate ligand ; pH-dependent ; Weak interactions ; Topology
• 刊名：Journal of Solid State Chemistry
• 出版年：2011
• 出版时间：July 2011
• 年：2011
• 卷：184
• 期：7
• 页码：1581-1590
• 全文大小：1807 K

文摘

Six complexes based on a flexible tripodal ligand H₃TTTA (2,2′,2″-[1,3,5-triazine-2,4,6-triyltris(thio)]tris-acetic acid) have been hydrothermally synthesized and structurally characterized. X-ray single-crystal diffractions reveal that they have rich structural chemistry: mononuclear, [Zn(HTTTA)(2,2′-bpy)(H₂O)₃]_n (1); dimeric metallamacrocycle, [Zn(HTTTA)(2,2′-bipy)(H₂O)]_n (2) and [Cd(HTTTA)(2,2′-bipy)(H₂O)·H₂O]_n (3); two-dimensional networks with binodal (3,6)-connected CdI₂ topology based on linear trinuclear M₃(μ²–CO²)₄(μ₂–CO₂)₂ SBUs (Secondary Building Units), [M₃(TTTA)₂(2,2′-bipy)₂(H₂O)_m·nH₂O]_n (M=Zn·4, m=0, n=4; Cd·5 and Mn·6, m=2; n=2). The value of pH and the metal ions has large influences on the resulting structures. The flexible tricarboxylic acid exhibits four coordination modes from monodentate to μ⁶-bridge. Fluorescence and magnetic properties of the complexes have also been investigated in details.