The configuration and lattice dynamics of complexes of dialkyltin(IV) with adenosine 5′-monophosphate and phenyl phosphates

Abstract

The dialkyltin (IV) complexes of the mononucleotide adenosine 5′-monophosphate (AMP) and of phenyl phosphate, SnR₂(AMP)·2H₂O (R = Me or Buⁿ) and SnR₂[PO₃(OPh)](R = Me, Et, or Buⁿ), have been prepared and structurally characterized in the solid state by means of ¹¹⁹Sn Mössbauer spectroscopy, determination of lattice dynamics by temperature-dependent ¹¹⁹Sn Mössbauer spectroscopy, and by vibrational studies using conventional and Fourier-transform i.r. spectroscopy. The known diphenyl phosphate complexes SnR₂[PO₂(OPh)₂]₂(R = Me, Et, or Buⁿ) have been similarly investigated, particularly with respect to their lattice dynamics. A distorted-octahedral configuration is proposed for the tin environment in the complexes SnR₂(AMP)·2H₂O (which appear to be phosphate-only bonded species) and SnR₂[PO₃(OPh)], involving a trifurcated oxygen atom and bent SnC₂ skeletons; these units appear to be embedded into two-dimensional solid-state polymers originating from intermolecular bridging of the phosphate groups. The regular octahedral structure, with linear SnC₂ skeletons, which has been inferred for the complexes SnR₂[PO₂(OPh)₂]₂, as well as their polymeric, sheet-like, nature, has been confirmed.