The synthesis of a new dithiophosphonic acid and its coordination properties toward Ni(II): A combined NMR and X-ray diffraction study

In order to investigate the coordination properties of the new, dianionic, S-donor ligand 4-methoxophenyldithiophosphonate (L), a dithiophosphonate salt of L(H2pz)2 formula was prepared (Hpz = pyrazole), characterized by multinuclear solution and solid state NMR, and subsequently employed in the synthesis of two Ni(II) metal complexes of [NiL2](H2pz)2 and [NiL2](HNEt3)2 formula. The latter species were fully characterized by a combined NMR and X-ray diffraction study, allowing to disclose interesting structural features, such as subtle deformations of the ligand (and their influence on the magnetic resonance properties of the 31P nuclei), imposed by distinct hydrogen-bond patterns.

Graphical abstractThe new S-donor 4-methoxophenyldithiophosphonate ligand (L) and the corresponding trans-[NiL2]2− metal complex have been investigated by combining 13C and 31P solution and solid state NMR techniques as well as X-ray crystallography.Figure optionsDownload full-size imageDownload as PowerPoint slide