Complexation of lead(II) with O,O-dialkyldithiophosphate ligands: P and C CP/MAS NMR and single-crystal X-ray diffraction studies

Polycrystalline lead(II) complexes with O,O^′-dipropyl- and O,O^′-di-cyclo-hexyldithiophosphate ions were prepared and studied by means of ³¹P, ³¹C CP/MAS NMR spectroscopy and single-crystal X-ray diffraction. Prepared complexes are characterised by polynuclear structures, in which pairs of dithiophosphate groups asymmetrically link neighbouring lead atoms, forming infinite linear zigzag chains. In spite of the same combined structural function, dithiophosphate ligands in both complexes display structural inequivalence. To characterise the combined structural state of the dialkyldithiophosphate ligands, ³¹P chemical shift anisotropy parameters, δ_aniso and η, were estimated from spinning sideband patterns in experimental CP/MAS NMR spectra for each of the two prepared complexes as well as the initial potassium O,O^′-dipropyl- and O,O^′-di-cyclo-hexyldithiophosphate salts.