Design and construction of two new polymers featuring macrocyclic subunits based on a rigid clamp-like ligand

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• 作者：Jie Wu ; Fangfang Pan ; Hongwei Hou ; Jin’ ; an Zhao ; Yaofei Zhao ; Yaoting Fan
• 关键词：Multipyridine ; Zinc complex ; Cobalt complex ; Crystal structure ; Fluorescence properties
• 刊名：Inorganic Chemistry Communications
• 出版年：2009
• 出版时间：August 2009
• 年：2009
• 卷：12
• 期：8
• 页码：750-754
• 全文大小：432 K

文摘

Reaction of a rigid conjugated clamp-like ligand N,N′-bis(pyridin-3-yl)-2,6-pyridinedicarboxamide (bppdca) with ZnSO₄·7H₂O or CoSO₄·7H₂O resulted in the formation of two new polymers, namely, {[Zn₂(bppdca)(SO₄)₂(DMF)₂]·(DMF)}_n (1) and {[Co(bppdca)(SO₄)(CH₃OH)(DMF)]·H₂O}_n (2). Both 1 and 2 feature one-dimensional double-chain structures with macrocyclic subunits, and the chains further self-assemble into a higher-dimensional framework via the hydrogen-bonding and π–π stacking interactions. Fluorescence studies show that the free ligand displays a strong fluorescence emission in solid state at room temperature, but in 1 and 2, the complexation of the ligand with metal ions and weak intermolecular interactions make the fluorescence emission partial quenching.