6533b7d6fe1ef96bd126653a

RESEARCH PRODUCT

Mössbauer spectroscopic studies of clusters Mn2(CO)8[μ-Sn(hal)Mn(CO)5]2 (hal = Cl, Br) and related Mn and Re compounds

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Abstract In order to be acquainted with the nature of bonds at Sn involved in the title compounds, as well as to get information on the configuration of the strictly related derivatives I2Sn2Mn4(CO)18 and Cl2Sn2Re4(CO)18, the Mossbauer spectroscopic investigation reported in this paper has been carried out. The experimental parameters (isomer shifts, δ; nuclear quadrupole splittings, ΔE; for the bromide derivative only, the asymmetry parameter η and the sign of the nuclear quadrupole coupling constant e2qQ) have been discussed in connection with data concerning compounds with tin-transition metal bonds, mainly hal2Sn[Mn(CO)5]2 (hal = Cl, Br) and ClSn[Mn(CO)5]3. Rationalizations of ΔE and η have been effected by the point-charge model formalism. Deductions derived from Mossbauer-Zeeman spectral parameters have been interpreted in the light of informations extracted from the molecular structures and the application of the second-order hybridization concept. A s character sequence has been proposed for SnMn and Snhal bonds, as well as self-consistent sets of calculated absolute partial quadrupole splitting values, for the title compounds and quoted halotin-manganese pentacarbonyls.