Heterobimetallic Complexes Containing Cu and Si

Abstract

[Bis(propanediamine)Cu]Cl₂, (1) was allowed to react with SiCl₄ to yield a bimetallic complex (2). Compound (2) was then treated with pyridine to attain the maximum coordination number of silicon (3). The reaction was also followed conductometrically. Complex (3) was reacted with sodium diethyl dithiocarbamate (dtc) to yield (4). The dtc in (4) acts as a bidentate chelating agent as its IR spectrum showed the CS₂ stretching frequency at 1020 cm^–1 which is characteristic of a symmetrically bonded dithiocarbamate group. There is a common peak in the range 246 to 260 nm in the UV‐Vis. spectra of (1), (2) and (3) due to L→M charge transfer. The EPR spectra of all species showed different environments for the Cu(II) ion in the various compounds indicating stereochemical changes.

Acknowledgment

The authors are thankful to Prof. S. H. Afaq, Faculty of Medicine, for recording UV‐Vis. spectra, to the Chairman, Department of Chemistry, for providing the necessary research facilities for this project and to Prof. R. J. Singh, Department of Physics, Aligarh Muslim University, Aligarh, for recording the EPR spectra.