Bismuth(III) Complexes Based on Bis(triazol) Ligands: Effect of Fluorine Substitution on the Structure and Catalysis for the Polymerization of Glycolide

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• 作者：Jian Gao ; Yu Yuan ; Ai-Jun Cui ; Feng Tian ; Sheng-Chun Chen ; Ming-Yang He and Qun Chen
• 刊名：Zeitschrift f蹲 anorganische und allgemeine Chemie
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：642
• 期：11-12
• 页码：698-703
• 全文大小：716K
• ISSN：1521-3749

文摘

Two bismuth(III) complexes {[Bi(btx)_0.5Cl₄](Hbtx)}_n (1) and [Bi₂(Fbtx)Cl₁₀](H₂Fbtx)₂(MeOH) (2) based on the nonfluorinated ligand 1,4-bis[(1,2,4-triazole-1-yl)methyl] benzene (btx) or the perfluorinated analogue 1,4-bis[(1,2,4-triazole-1-yl)methyl]-2,3,5,6-benzene (Fbtx) were synthesized and characterized. Single-crystal X-ray diffraction revealed that 1 is a coordination polymer consisting of an anionic one-dimensional chain, whereas 2 shows a discrete ionic-paired structure. Furthermore, 1 was found to be more active than 2 toward the bulk solvent-free polymerization of glycolide, giving poly(glycolic acid) (PGA) with high molecular weights and moderate molecular weight distributions. The results indicated that the substituent effect plays an important role in controlling the structure and catalytic activity of such complexes.