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The cationic sulfur dioxide complexes [CpFe(CO)2SO2]+AsF6- (7) and [CpCr(NO)2SO2]+AsF6- (9) are obtained in almost quantitative yield from CpFe(CO)2I(CpCr(NO)2Cl) and AgAsF6 in liquid SO2. With excess transition metal halide dinuclear halogen-bridged cations ([CpFe(CO)2IFe(CO)2Cp]+ and [CpCr(NO)2ClCr(NO)2Cp]+) are formed. The crystal structure of 7 is reported, and the bonding in the complexes is discussed in the light of spectroscopic data.
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Hartmann et al. (1982) studied this question.
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