Synthesis and spectroscopic characterization of cadmium(II) complexes of thiones and thiocyanate

Abstract

Cadmium(II) complexes of thiones and thiocyanate, [(>C=S)₂Cd(SCN)₂], have been prepared and characterized by IR and NMR spectroscopy. An upfield shift in the >C=S resonance of thiones in the ¹³C NMR and downfield shift in N–H resonance in ¹H NMR are consistent with sulfur coordination to cadmium(II). The presence of ν(N–H) of thiones in IR spectra of the complexes indicates the thione forms of the ligands in the solid state; some contribution of the thiolate form was observed in one complex. The appearance of a band around 2100 cm⁻¹ in IR and a resonance around 132 ppm in ¹³C NMR indicates the binding of thiocyanate to cadmium(II).

Keywords:

• Cadmium(II) complexes
• Thiones
• Thiocyanate
• NMR spectroscopy

Acknowledgements

Financial support from the Pakistan Council for Science and Technology, Islamabad, Pakistan and from King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia is gratefully acknowledged.