Tungsten(VI) N-heterocyclic carbene adducts: Synthesis, characterization and theoretical studies

INOR 124

Mark D Spicer, m.d.spicer@strath.ac.uk1, Christopher A Dodds1, and Colin D. Abernethy2. (1) WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, United Kingdom, (2) Department of Chemistry, Keene State College, 229 Main St., Keene, NH 03435-2001
N-heterocyclic carbene (NHC) ligands are widely used in mid- to low-valent complexes for catalytic applications. In view of their donor ability and steric footprint they are good candidates for stabilisation of higher oxidation state complexes, but this aspect of their chemistry has been neglected to a surprising extent. We have previously reported the first structurally characterised high oxidation state NHC complex, a 1:1 adduct with vanadium oxytrichloride.

Here we report the synthesis and characterisation of a 1:1 NHC adduct with tungsten(VI) oxytetrachloride and describe its hydrolysis products, including a structurally characterised 1:1 NHC adduct with tungsten(VI)dioxydichloride (see figure below). A theoretical (DFT) investigation of these complexes gives insight into their structure, bonding and reactivity.

 

Organometallic Synthesis
1:30 PM-5:20 PM, Sunday, August 19, 2007 BCEC -- 212, Oral

Division of Inorganic Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007