MOLYBDENUM(VI), MOLYBDENUM(V), AND MOLYBDENUM(IV) OXO COMPLEXES WITH S-METHYL 3-(2-HYDROXYPHENYL)METHYLENEDITHIOCARBAZATE AND ITS DERIVATIVES

A number of molybdenum(VI), -(V), and -(IV) oxo complexes with S-methy l 3-(2-hydroxyphenyl)methylenedithiocarbatate and its derivatives as t he ONS-donor metal-binding substrate are synthesized. The Mo(VI)-dioxo complexes are cis-dioxo MoO(2)L(D), where D is solvent molecules such as MeOH, DMF, Py(pyridine), DMSO, and gamma-Pic(gamma-picoline). The Mo(V)-oxo complexes are of the type (PyH)[MoO(NCS)(2)L] with an octahe dral geometry. The Mo(IV)-oxo complexes, MoOL are derived from corresp onding Mo(VI)-dioxo complexes by oxo abstraction with PPh(3). The comp lexes are characterized by IR, H-1-NMR, UV-Vis spectroscopy and cyclic voltammetry. On the basis of ligand displacement reaction, the qualit ative order of D binding for MoO(2)L(D) complexes is also discussed.