title: Imidotungsten(VI) complexes with chelating amino and imino phenolates.
abstract: The reaction of WOCl(4) with 2,4-di-tert-butyl-6-((isopropylamino)methyl)phenol followed by the reaction with phenyl isocyanate leads to the formation of imidotungsten(VI) complex [W(NPh)Cl(3)(OC(6)H(3)(CH(2)NH-i-Pr)-2-t-Bu(2)-4,6)] 4 with a chelating aminophenolate ligand. When the same procedure was applied using aminophenols with bulkier substituents in the amino group, the final product was an unexpected Schiff-base complex [W(NPh)Cl(3)(OC(6)H(3)(CH=NPh)-2-t-Bu(2)-4,6)] 5, where the ligand is derived from 2,4-di-tert-butyl-6-((phenylimino)methyl)phenol. Complex 5 is also formed in the thermal degradation of 4. On the whole, 5 appears to be formed by a disproportionation of intermediate compounds, which are analogous to complex 4. The solid-state structures of 4 and 5 have been determined by X-ray crystallography whereas the solution structures were studied by (1)H and (13)C NMR.
authors.affiliation: Laboratory of Inorganic Chemistry, Department of Chemistry, University of Jyväskylä, FI-40351, Jyväskylä, Finland.
authors.forename: Mikko M
authors.initials: MM
authors.lastname: Hänninen
authors.forename: Reijo
authors.initials: R
authors.lastname: Sillanpää
authors.forename: Henri
authors.initials: H
authors.lastname: Kivelä
authors.forename: Ari
authors.initials: A
authors.lastname: Lehtonen