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.