The synthesis, crystal structure, and spectroscopic characterization of a tetrakis(mu-N,N '-diarylformamidinato)chlorodirhenium(III,III) cationic complex

A variety of dirhenium compounds has been synthesized with (ArNC(H)NAr)(-) where Ar is a substituted C,H, or C,H, aryl ring with different electron wi thdrawing and electron donating substituents. Reactivity studies of AgBF4 w ith tetrakis(mu -N,N ' -di-arylformamidinato)dichlorodirhenium(III,III) com plex with a p-MeO substituted aryl ring result in the loss of a single axia l chloride from the Re2Cl2(III,III) species to yield a cationic complex, [R e2Cl[(p-MeOC6H4)NCHN(p-MeOC6H4)](4)][BF4] and AgCl. The X-ray crystal struc ture, UV-Vis and NMR spectroscopy. and electrochemical characterization of the cationic Re2Cl(III,III) derivative [Re2Cl[(p-MeOC6H4)NCHN(p-MeOC6H4)](4 )][BF4] are compared to the parent neutral Re2Cl2(III,III) complex, Re2Cl2[ (p-MeOC6H4)NCHN(p-MeOC6H4)](4). (C) 2001 Elsevier Science Ltd. All rights r eserved.