Nike Prilil Puspita Sari, Lis Siaturohmah, Effendy, Fariati
1,3-Bis(diphenylphosphino)propane (dppp) and copper(I) halide form in chloroform a dimeric coordination compound [(dppp-P,P)Cu(μ-X)2Cu(dppp-P,P')]. A coordination compound of copper(II) halide with dppp has never been synthesized. However, reduction of copper(II) to copper(I) may occur during the synthesis. The present investigation is focused on the reduction of copper(II) to copper(I) in the course of the reaction of CuX2 (X = Cl, Br) and dppp of 1:1 mole ratio in acetone. The synthesis conducted produces M (CuCl2 and dppp) and N (CuBr2 and dppp). They are colorless prism and needle crystals and have a melting point in the ranges of 82°C - 84°C and 165°C - 167°C, respectively. The free energy of M compound is -11711,9383 kJ mol-1, while that of N compund is -14507,58 kJ mol-1. Halide ion qualitative and electrical conductivity tests show that M compound is molecular, while N compound is an ionic one. The predicted chemical formulas of M and N compounds are [(dppp-P,P')Cu(μ- Cl)2Cu(dppp-P,P')] and [Cu(μ-dppp)2Cu(μ-dppp)]n.2nBr. Although the result differs from what was expected, both coordination compounds are obtained in the course of reduction of copper(II) to copper(I).
Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Malang, 5 Semarang Street, Malang, Indonesia
