title: Synthesis and reactivity of catecholate complexes containing quadruply bonded metal ions.
abstract: Quadruply bonded metal complexes of rhenium and molybdenum have been prepared with tetrachlorocatechol. Structural characterization on the [Re(2)(Cl(4)Cat)(4)](2-) anion has shown that it consists of distorted square-planar Re(Cl(4)Cat)(2) units linked by a short (2.2067 A) quadruple Re-Re bond. The addition of tetrachlorocatechol to molybdenum acetate was used to prepare the isoelectronic molybdenum analogue "[Mo(2)(Cl(4)Cat)(4)](4-)". This complex was found to be far more reactive than the rhenium dimer. A dimer containing a Mo-Mo double bond, [(Cl(4)Cat)(2)Mo(mu-O)(mu-OCH(3))Mo(Cl(4)Cat)(2)](3-), was obtained as the methanolysis product of the complex formed initially, and the oxomolybdenum(V) monomer [MoO(Cl(4)Cat)(2)](-) was formed under more oxidative conditions. Both complexes are oxygen-sensitive, giving [MoO(2)(Cl(4)Cat)(2)](2-) as the final air-stable complex product.
authors.affiliation: Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, USA.
authors.forename: Jason
authors.initials: J
authors.lastname: Christ
authors.forename: Corinne
authors.initials: C
authors.lastname: Epps
authors.forename: Victoria
authors.initials: V
authors.lastname: Pritchard
authors.forename: Derek
authors.initials: D
authors.lastname: Schmeh
authors.forename: Cortlandt
authors.initials: C
authors.lastname: Pierpont
authors.forename: Ebbe
authors.initials: E
authors.lastname: Nordlander