The Mössbauer Spectroscopy of Tin Halide Complexes with Organophosphorus Ligands

The Mössbauer parameters (the isomer shift δ, the quadrupole splitting ΔE, and the probability of recoilless absorption f') have been analysed for a large number (more than 200) of complexes of mono- and bi-dentate organophosphorus complexes with tetra-alkyltin and alkyltin halides. It is shown that the Mössbauer method can be used to determine the localisation centres of the donor–acceptor bond in complexes of organophosphorus compounds with tin tetrahalides and to determine the geometrical structures of the complexes. It has been observed that the quantities δ, ΔE, and f' for the compounds [R'R''R'''P(Y)]₂₍₁₎SnR_nX_4–n are definitely influenced by the nature of the substituents in the ligand and in the acceptor. This influence can be described with the aid of the reaction constants of the substituents σ^ph and σ*.
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