Electrospray mass spectrometric studies of some cationic and anionic Group 6 and Group 7 metal carbonyl complexes

Article abstract of DOI:10.1016/0022-328X(93)80273-E

Electrospray mass spectra derived from dichloromethane or dichloromethane/methanol solutions of cationic and anionic metal carbonyl compounds are reported for the first time.The cations investigated are the seven coordinate species ⁺ (M=Mo, W; P-P = diphosphine or similar ligand; X=F, Cl, Br, I) and carbonyl phosphonium or arsonium cations of the types 1-P-PMe)(η²-P-P)>⁺ (M=Cr, Mo, W), 1-P-PMe)(η²-P-P)X>⁺ (M'=Mn, Re).These cations were prepared by the action of MeI on M(CO)3(η¹-P-P)(η²-P-P) and M'(CO)2(η¹-P-P)(η²-P-P)X, respectively, each of which contains a pendant Group 15 atom.The anionic species investigated are ^- and ^-.In all cases the dominant peak in the mass spectrum corresponds to the principal ion known to be present in solution.