SUMMARYSolutions of Fe(ll) and thiolates (RS-: Fe2+ > 2; R = alkyl, phenyl) absorb carbon monoxide anddepending on the reaction conditions -several different anionic iron carbonyl derivatives are formed. Twowere isolated and their crystal structures determined. (2)A) from the three sulphur atoms; on the contrary in complex 1 in the Na+ is nearer to two of the three sulphur atoms (3.083(6)A and 3.334(6)A for the two different Na ... S distances). The infrared spectra of the compounds were recorded in a variety of solvents and in the solid state. The Rarnan of crystalline 2 was also recorded. The failure of the vibrational spectra of crystalline 2 to follow either molecular point group or factor group predictions is explained in terms of an effectiva vibrational unit -and so, effective factor group -similar to that implicit in a factor group analysis of 1.

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