Synthesis, spectral, electrochemical, thermal and biological studies of benzyl/tolylxanthates of cadmium(II)

Department of Chemistry, University of Jammu, Baba Sahib Ambedkar Road, Jammu-180 006,

Jammu & Kashmir, India

E-mail : kpsushil@rediffmail.com

Manuscript received online 17 April 2017, accepted 15 June 2017

New dithiocarbonates of cadmium(II) corresponding to [(ArOCS₂ )₂Cd], [(ArOCS₂ )M{S₂POCH₂C(CH₃)₂CH₂O}] and [(ArOCS₂) ₂Cd.nL] (Ar = o-, m-, p-CH₃C₆H₄ /C₆H₅CH₂ ), L = N₂C₁₂H₈ , N₂C₁₀H₈ ; n = 2, L = NC₅H₅ , P(C₆H₅ )₃ have been isolated by the reaction of sodium salt of dithiocarbonates with cadmium dichloride in 1 : 2 molar ratio, mixed ligand complex in 1 : 1 : 1 molar ratio by the reaction of dithiocarbonate, alkylene dithiophosphate and metal salt in aqueous medium and their adducts with phosphorous and nitrogen donor ligand in 1 : 1 and 1 : 2 molar ratio. These complexes have been characterized by elemental analyses, mass, IR and heteronuclear NMR (¹H, ³1P and ¹³C) spectroscopic analysis. Thermal and redox properties of complexes were studied by thermogravimetric analysis and cyclic voltammetry. These studies confirm that in the nitrogen and phosphorous donor complexes the geometry around the cadmium metal centre is distorted octahedral, and in the parent cadmium dithiocarbonate complex it is distorted tetrahedral. The dithiocarbonate ligands and some selected complexes were screened against Fusarium oxysporum shows that the free ligands reveal significantly less activity compared to the corresponding cadmium complexes.