Abstract
Abstract Complexes of stoichiometry MnLX2 (L = tertiary phosphine, X = halogen) have been prepared as films on infrared windows. The complexes were exposed to SO2/evacuation cycles with their infrared spectra monitored before and after periods of exposure. For low pressure, relatively brief exposure times, a series of MnLX2/SO2 adducts were obtained which were reversible in that the SO2 could be removed upon evacuation. However, a competitive decomposition channel existed, which was accentuated by longer exposures and higher pressure, which produced irreversible complexes having stoichiometry MnLX2 · ½SO2. Dioxygen was found to displace SO2 from the reversible adducts, and SO2 decomposed the dioxygen adducts to a mixture of the phosphine oxide complex and the irreversible SO2 adduct. It has been postulated that SO2 interacts with the polymeric MnLX2 complexes through bridging coordination involving more than one of the atoms of SO2.
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