X-ray photoelectron spectroscopic study of organometallic nitrosyl compounds of chromium, molybdenum, and tungsten

Recent organometallic nitrosyl chemistry

“…Crs+-Cl°". 44 The hard Lewis acid tricyclopentadienylsamarium, Cp3Sm, has been used to investigate the Lewis basicity of bound NO in three kinds of ligation modes, namely, (i) terminal, (ii) two-metal bridging, and (iii) three-metal bridging. 223 The specific complexes used were CpCr-(CO)2(NO), 4 (M = Cr) for terminal NO, [CpFe(NO)]2, 20a for two-metal bridging NO, and Cp'3Mn3(NO)4 for three-metal bridging NO.…”

“…A single-crystal, crystallographic analysis of 43 confirms the atom connectivity shown.143 Warming of this bimetallic complex results in hydride transer to form CpRe-(NO)(PPh3)CH3 and [CpRe(NO)(PPh3)(=C(H)SMe)]+. The manganese carbene complexes44 have been ob-carbonyl groups in [CpMn(CO)2(NO)]+, as exemplified by the overall reaction depicted schematically in eq 15 144 ^he reaction proceeds in the presence of a halide [M-C = 0]+ + X<]…”

Cyclopentadienyl Complexes of Chromium, Molybdenum and Tungsten

“…191 Photoelectron spectra o f [M(Cl)(NO) 2 Cp] show that backbonding to the NO groups increases down the group. 629 647 The electronic structure of [Cr(NO)(jx-NO)Cp] 2 has been analysed in relation to isoelectronic iron and manganese carbonyl complexes. 648 It undergoes a two-electron oxidation to [Cr(NO) 2 (NCMe)Cp] + and also a reversible one-electron reduction to a radical anion; chemical reduction gives only low yields of known [Cr 2 (NO) 2 (u-NO)(u-NH 2 )Cp 2 ] and [Cr(NO)(u-NH 2 )Cp] 2 , which can also be prepared by catalytic hydrogenation.…”