Adducts of oxovanadium(IV) dithiocarbamates

Abstract

Pyridine and 4-methylpyridine adducts of oxovanadium(IV) dithiocarbamates have been isolated and characterized as solids. It has been shown that the addenda can be removed under mild conditions with concomitant regeneration of the parent dithiocarbamate (DTC) complexes. Attempts to isolate dimethyl-sulfoxide adducts have not been successful, although spectral evidence suggests that adducts are formed in solution. A qualitative rationalization of the molecular orbital ordering and electronic spectral properties of the adducts is presented.

Synthesis and characterization of oxovanadium (IV) dithiocarbamates with pyridine

“…If we compare the VO(RNCS 2 ) 2 complex with the adduct or derivative, we observed that these show the V=O band displaced to lower frequencies (990-970 cm -1 ) than the complex (1000-980 cm -1 ). Similar results are obtained in other complexes of oxovanadium(IV) with dithiocarbamates 8 , dithiocarboxylates 9 , 8-quinolinate 10 , benzoylacetonate 11 or dibenzoylmethanate 12 as ligands. This displacement can be attributed to the electronic donation of the base to the vanadium (N®V), which increases the electron density on the metal d-orbitals, and consequently the p p ®d p donation from the oxygen atom to vanadium is expected to be reduced.…”

Vanadyl(IV)-monothio-.beta.-diketone complexes. I. Square-pyramidal compounds

“…Accordingly, we have undertaken an investigation of vanadyl (IV) compounds involving second-period donor atoms, with emphasis on sulfur. 3,4 In view of recent developments in the coordination chemistry of monothio-0-diketones,5 it seemed partic-cularly worthwhile to investigate vanadyl(IV) complexes of such ligands in detail. The ligands used in this work and our abbreviations for these ligands are Livingstone6 has reported a dimeric complex formed from a fluorinated monothio-S-diketone and V02+, for which the following structure was proposed I ,0s.…”

Vanadyl-tartaric acid system at low pH. Equilibrium quotients and complexation kinetics

“…Accordingly, we have undertaken an investigation of vanadyl (IV) compounds involving second-period donor atoms, with emphasis on sulfur. 3,4 In view of recent developments in the coordination chemistry of monothio-0-diketones,5 it seemed partic-…”