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Effect of the cation on the anion structure in mixed bis(di-n-propylammonium) and bis(di-n-butylammonium) tetrahalocuprates(II)

J. Tomovič, Z. Biela, and J. Gažo

Department of Inorganic Chemistry, Slovak Technical University, CS-812 37Bratislava

 

Abstract: Mixed tetrahalocuprates(II) A2CuClxBr4-x (A=(n-C3H7)2NH2 , (n-C4H9)2-NH2; x = 0, 1, 2, 3, 4) were prepared and studied. According to the energies of the d—d transitions, -v = 8100—8800 cm-1, the structure of the anion in [(n-C4H9)2 NH2]2CuClxBr4-x( appears to be a distorted tetrahedron. The structure of mixed tetrahalocuprates(II) having the (n-C3H7)2NH2+ cation varies with x: the anion structure is tetrahedral for x = 0 and 1 and planar for x = 2, 3, and 4 (d—d transition energy; -v≈12 500 cm-1). DTA curves of compounds with distorted tetrahedral anions show an endothermal change at a tempera­ ture lower than the melting point, suggesting a phase transition associated with a change in the molecular structure. On DTA curves of compounds having planar anions such a change was not observed.

Full paper in Portable Document Format: 381a75.pdf

 

Chemical Papers 38 (1) 75–83 (1984)

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