The first oxidation of a Cr(2)(4+) paddlewheel complex to an isostructural stable product.
The first cation containing a Cr(2) core surrounded by a paddlewheel arrangement of four bridging ligands has been prepared and characterized. The bridging ligands are the guanidinate anions [(PhN)(2)CN(CH(2))(4)](-). In the neutral Cr(2)(4+) compound the average Cr-Cr distance is 1.904[1] A, and in the cation (which is accompanied by a PF(6)(-) anion) the Cr-Cr distance is 1.9249(9) A. The cation has one unpaired electron, but the EPR spectrum is devoid of hyperfine structure and has g approximately 2.00. We proposed that the oxidation is essentially delocalized on the ligands.
Cotton
F Albert
FA
Department of Chemistry and Laboratory for Molecular Structure and Bonding, P.O. Box 30012, Texas A&M University, College Station, Texas 77842-3012, USA. Cotton@tamu.edu
Daniels
Lee M
LM
Huang
Penglin
P
Murillo
Carlos A
CA