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Various zinc dicarboxylate catalysts were synthesized by the reaction of zinc oxide with eleven different glutaric acid derivatives, and their coordination characteristics were investigated by infrared spectroscopy. The electronic nature and steric hinderance of substituents influenced the coordination of the carboxylate and the zinc metal ion. The coordination characteristics were classified into three categories: i) compounds exhibiting bridging bidentate coordinating bonding modes, such as syn-anti and syn-syn bridging: ii) compounds with only unidentate coordination: and iii) compounds with mixed coordinations of unidentate and

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