ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

CuSO₄-NH₃-(NH₄)₂CO₃-NH₄SCN-H₂O system. II. Physicochemical investigation of solutions

J. Garaj and J. Gažo

Slovak Technical University, Bratislava

Abstract: cf. CA 63, 14119g. The systems CuSO₄-H₂O, CuSO₄-NH₃-H₂O (A), CuSO₄-NH₃NH₄SCN-H₂O (B), CuSO4-NH₃-(NH₄₎₂CO₃-H₂O (C) and Cu-SO₄-NH₃-(NH₄)₂CO₃-NH₄SCN-H₂O (D) (0.O5M solns.) were studied spectrophotometrically in the visible region. By the addn. of SCN-to A, NH₃ mols. are substituted by SCN- and N atoms are bound in an inner Cu(II) complex, without changing the symmetry of the atoms. By the addn. of CO₃^2- to A, there is a great tendency of CO₃^2- to enter into the inner sphere of the Cu(II) complex by replacing NH₃ mols. with the formation of a complex with a molar ratio Cu(II): CO₃^2- equal or nearly equal to 1:1. The absorption curves of the system A-D indicate a complex with a heterogenous sphere, with the ligands SCN^- and CO₃^2- simultaneously bound on the central atom. The formation of trans-Cu(SCN)₂(NH₃)₂ from these solns. is not dependent on the substitution reactions but on some other secondary factors.

Full paper in Portable Document Format: 203a196.pdf (in Slovak)

Chemical Papers 20 (3) 196–201 (1966)