The Moessbauer spectra of compounds with general formula [(p-C5H5)Fe(CO)2]2SnXY (X = Ph, MeOPh, MePh, ClPh; Y = NO3, NO2, N3, etc.) were studied. The corresponding Moessbauer parameters for iron were essentially independent of the nature of X and Y. However, the substituents did affect the parameters for tin.

Key words: BENZENE P, CARBONYL COMPOUNDS, CHEMICAL BONDS, IRON COMPOUNDS, ELECTRON DENSITY, TIN COMPOUND, MOSSBAUER SPECTROMETRY, ELEMENTARY ORGANIC CHEMISTRY