Reductive nitrosylation of tetraoxometallates: XIII. Generation of {V(NO) 2} 2+ moiety: Synthesis of [V(NO) 2(CN) 4] 2− and [V(NO) 2(CN) 2(L-L)] (L-L = 2,2′-bipyridine and 1,10-phenanthroline) directly from VO 43− in aqueous-aerobic media

Abstract

The vanadium(0) dinitrosyl complex [V(NO) 2(CN) 4] 2− containing {V(NO) 2} 2+ moiety is generated for the first time via reductive nitrosylation of VO 4 3− with NH 2OH and CN − in an alkaline medium. The complex anion reacts with L-L [L-L = 2,2′-bipyridine (bipy) or 1,10-phenanthroline (phen)] in an aqueous medium to give [V(NO) 2(CN) 2(L-L)]. The complexes show characteristic IR bands and paramagnetism, as expected for a system containing a single unpaired electron. They give interesting EPR signals, with g av close to 2.0.