Abstract
[M(CO)4(N—N)] reacts with CuCl to give new heterobimetallic metal carbonyls of the type [M(CO)4(N—N)(CuCl)], M = W, Mo; N—N = 2,2′-bipyridine (bipy), 1,10-phenanthroline (phen). Reactions of [M(CO)4(N—N)(CuCl)] with NaSCN produced the series of complexes of general formula [M(CO)4(N—N)(CuSCN)]. The i.r. spectral of all the bimetallic carbonyls exhibited the general four ν (CO) band patterns of the precursors. The u.v.–vis. spectral data for precursors and products showed bands associated with π → π* (nitrogen ligands), d→d (intrametal), as well as MLCT d→π* (nitrogen ligands) and MLCT d → π*(CO) transitions. The [M(CO)4(N—N)(CuX)] (X = Cl, SCN) emission spectra showed only one band associated with the MLCT transition. The t.g. curves revealed a stepwise loss of CO groups. The initial decomposition temperatures of the [M(CO)4(N—N)(CuX)] series suggest that the bimetallic compounds are indeed thermally less stable than their precursors, and the X-ray data showed the formation of MO3, CuMO4, Cu2O and CuO as final decomposition products, M = W, Mo. The spectroscopic data suggests that the heterobimetallic compounds are polymeric.
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Haddad, P.S., Mauro, A.E., Nogueira, V.M. et al. Spectroscopic investigation and thermal behavior of new carbonyl complexes [M(CO)4(N—N)(CuX)], (M = W, Mo; N—N = 2,2′-bipyridine, 1,10-phenanthroline; X = Cl, SCN). Transition Metal Chemistry 28, 899–904 (2003). https://doi.org/10.1023/A:1026332111423
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DOI: https://doi.org/10.1023/A:1026332111423