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Copper(I) complexes of nitrogen-sulphur ligands. 1-Phenyl-4,6-dimethylpyrimidine-2-thione and its protonated form as ligands in copper(I) complexes. Chemical, spectroscopic, conductivity and polarographic studies

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Summary

1-Phenyl-4,6-dimethylpyrimidine-2-thione (L) and its protonated cation 1-phenyl-4,6-dimethyl pyrimidinium-2-thione\((L\mathop H\limits^ + )\), have been employed to prepare the following copper(I) complexes: CuXL (X=Cl, Br, I, ClO4 or BF4), (CuX)3L2 (X=Cl, Br, I or SCN), (CuX)2L5 (X= ClO4 or BF4) and the zwitterionic species CuXY(LH) X=Y=Cl, Br or I; X=Br; Y=Cl; X=I; Y=Br). Chemical analysis, conductivity, and near-and far-i.r. spectroscopic data are presented and the chemical relationships between them discussed in terms of postulated dinuclear or polynuclear species for the complexes. Metalligand vibrations suggest that the neutral ligand is N, S-bidentate in its copper(I) complexes as well as S-coordinat for the\((L\mathop H\limits^ + )\) cation in the zwitterionic compounds. Diagnostic i.r. bands frequencies of counterions and γ(Cu−X) modes indicate the coordinating character of Cl−, Br−, I−, SCN− and of ClO −4 , BF −4 (in CuXL) anions. For the chloro-complexes CuClL and (CuCl)3L2, salt-like species of the [CuL2][CuCl2] and [{Cu2L2Cl}n] [CuCl2]n type respectively, are proposed. The polarographic data for the perchlorate complexes have shown that in dimethylformamide (DMF) solution, the prevailing species are CuClO4L, CuClO4L2 and (CuClO4)2L5; their overall stability constants were determined.

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  1. Dipartimento di Chimica, Università di Modena, 41100, Modena, Italy

    Raffaele Battistuzzi

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Battistuzzi, R. Copper(I) complexes of nitrogen-sulphur ligands. 1-Phenyl-4,6-dimethylpyrimidine-2-thione and its protonated form as ligands in copper(I) complexes. Chemical, spectroscopic, conductivity and polarographic studies. Transition Met Chem 13, 401–409 (1988). https://doi.org/10.1007/BF01043698

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