A calorimetric study of ternary zinc(II) complexes with chloride ions and 2,2'-bipyridyl in N,N-dimethylformamide.

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概要

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• Formation equilibria of ternary zinc(II) complexes with chloride ions and 2,2′-bipyridyl (bpy) have been calorimetrically studied in <I>N</I>,<I>N</I>-dimethylformamide (DMF) containing 0.4 mol dm<SUP>−3</SUP> (C<SUB>2</SUB>H<SUB>5</SUB>)<SUB>4</SUB>NClO<SUB>4</SUB> as a constant ionic medium at 25 °C. Formation of binary (2,2′-bipyridyl)zinc(II) complexes has also been explored. The calorimetric data were satisfactorily explained in terms of formation of the ternary [ZnCl(bpy)]<SUP>+</SUP> and [ZnCl<SUB>2</SUB>(bpy)] complexes together with the binary [Zn(bpy)<I><SUB>n</SUB></I>]<SUP>2+</SUP> (<I>n</I>=1–3) ones, and their formation constants and enthalpies were determined. The formation of the ternary [ZnCl(bpy)]<SUP>+</SUP> and [ZnCl<SUB>2</SUB>(bpy)] complexes is not so favorable in DMF. It is suggested that both [ZnCl(bpy)]<SUP>+</SUP> and [ZnCl<SUB>2</SUB>(bpy)] complexes have the four-coordinate tetrahedral structure in DMF.

• 公益社団法人 日本化学会の論文

著者

• Ohtaki Hitoshi

  Department Of Chemistry Faculty Of Science And Engineering Ritsumeikan University

• Nagy László

  Coordination Chemistry Laboratories, Institute for Molecular Science

• Ishiguro Shin-ichi

  Coordination Chemistry Laboratories, Institute for Molecular Science

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