Carbon-13 NMR Spectra of Some Group VIIB Transition Metal Thiocarbonyl and Selenocarbonyl Complexes

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Abstract
Recently, we reported the discovery of the first examples of transition metal selenocarbonyl complexes, (n5-C5H5) Mn (CO)2 (CSe) and (n6-C6H5CO2CH2(CO)2 (CSe).1 These complexes are particularly interesting because, unlike CO and CS, the diatomic CSe molecule has so far eluded isolation even at very low temperatures,2 and so these complexes represent the stabilization of a chemically unstable species through coordination to a metal (cf. metal carbene complexes). We have also synthesized several thiocarbonyl complexes of the same type,3,4 as well as the analogous rhenium selenocarbonyl complexes.4 While many detailed studies of the 13C nmr spectra of transition metal carbonyls have appeared in the literature over the past few years, there have been no such studies for the closely related thiocarbonyls and selenocarbonyls, although a few isolated data have been reported recently for metal thiocarbonyls.5,6 In this communication, we report the 13C nmr spectra of the isoelectronic series of complexes, (n5-C5H4R) M(COI)2 (CX) (M = Mn, R = H, CH3; M = Re, R = H; X = O,S, Se).