Coordination chemistry of dioxotungsten(VI) : Synthesis and characterization of some isothiocyanato complexes of dioxotungsten(VI) with biologically active chelating molecules

Abstract

<span style="mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">

<span style="mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""=""> The synthesis and characterization of some novel isothiocyanato complexes of dioxotungsten(VI) with the compositions [WO₂(NCS)₂ (L)₂ (HP)] where L=benzimidazole or 2,3-dimethyll-phenyl-3-pyrazoline-5-one; [WO₂ (NCS)₂ (L-L)] where L-L <span style="mso-bidi-font-size:3.0pt;font-family:" times="" new="" roman","serif""="">= <span style="mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">2- aminobenzothiazole, 4-amino-2,3-dimethyl-1-phenyl-3-pyrazoline- 5-one, 2-(2'-pyridyl)imidazole or 2,3-dimethyl-4- methylaminomethanesulphonatesodium monohydrate- 1-phenyl-3- pyrazoline-5-one and [WO₂NCS)₂(PYBZL)(H₂O) have been reported . These mixed ligand complexes have been prepared by the interaction of tetraisothiocyanatodioxotungsten(VI) anion with the respective ligand in aqueous medium in the presence of HCl. The complexes which have been characterized by elemental analysis,

<span style="mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">thermogravimetric analysis, conductance and magnetic measurements, and electronic and IR spectral studies, are found to contain <i style="mso-bidi-font-style:normal"><span style="mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">cis</span></i><span style="mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""=""> <span style="mso-bidi-font-size:3.0pt;font-family:" times="" new="" roman","serif""="">- <span style="mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">WO₂ structure.

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