Products of the interaction of copper and benzenediazonium tetrafluoroborate in acetonitrile medium

Chem. Met. Alloys 2 (2009) 123-129

https://doi.org/10.30970/cma2.0099

Eugen P. Koval’chuk, Oleksandr V. Reshetnyak, Vasyl’ Ya. Smetanets’kyj, Jerzy Błażejowski

The products of the chemical interaction of copper and a concentrated (³0.05 M) benzenediazonium tetrafluoroborate (BDFB) solution in acetonitrile have been studied. It is proposed on the base of the obtained results that the intermediate of the copper dissolution-ionization, which corresponds to an absorption band with a maximum at 432 nm, is the mixed complex [Cu(NºN-C₆H₅)(NºC-CH₃)₃]⁺, which contains three acetonitrile molecules and the copper ion covalently bonded to an azophenyl radical. This complex is thermodynamically unstable and decomposes slowly into a colorless crystalline and a black amorphous phase. The crystalline phase was identified as [Cu(NºC-CH₃)₄]⁺BF₄^- by X-ray diffraction, while the amorphous phase is a mixture of oligomeric products of different lengths, which are formed as the result of the condensation of azophenyl and phenyl radicals.

Mechanism of DAS - Cu interaction in the acetonitrile medium

Keywords

Сopper / benzenediazonium tetrafluoroborate / acetonitrile / dissolution-ionization / Cu(I) complexes / Crystal structure