Conclusions
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1.
Complexation in the CuCl2-HCl-H2O system is studied at 77 K. Comopunds of composition [CuCl4(H2O)2]2−, [CuCl3(H2O)3 −, [CuCl2(H2O)4], [CuCl(H2O)5]+, and [Cu(H2O)6]2+ are shown to be formed depending on the ratio HCl-H2O. Parameters of the spin Hamiltonian of the EPR spectra are determined.
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2.
The concentration dependence of the Cu(II) complexes which are formed in the HCl concentration range from 36 to 4% is obtained.
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3.
A classical stepwise complexation process in this system is observed between HCl concentrations from 36 to 19%. Between 19-17% HCl, an unpredictable change of the relative concentrations of Cu(II) compounds occurs. Lowering of the HCl concentration from 17 to 4% gives rise to [CuCl3(H2O)3]−, [CuCl2(H2O-4], and [CuCl(H2O)5]+, the relative content of which remains constant.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1223–1228, June, 1989.
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Larin, G.M., Minin, V.V., Levin, B.V. et al. Complexation in the CuCl2-HCl-H2O system. Russ Chem Bull 38, 1111–1116 (1989). https://doi.org/10.1007/BF00957133
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DOI: https://doi.org/10.1007/BF00957133