Reactivity of niobocene dihalogenides toward nitroso derivatives. EPR and IR characterization of the first niobium(IV) complexes containing an ArNO-N,O ligand

Article abstract of DOI:10.1016/0022-328X(94)05196-I

The reaction of 5-C5H4R)2X2> <1: R = SiMe3, X = Cl; 2: R = SiMe3, X = Br; 3: R = H, X = Cl; 4: R = ^tBu, X = Cl> with nitroso derivatives ArNO : Ar = Ph; b: Ar = o-CH3-C6H4; c: Ar = p-(CH3)2NC6H4> yields paramagnetic complexes formulated as 5-C5H4R)(η³-C5H4R)X2(ArNO-N,O) 1a, 1b, 1c, 2a, 3a, 4a nad 4c, which have been characterized by ESR and IR spectroscopy. Keywords: Niobium; Nitrosobenzene complexes; EPR; Electrochemistry