Cadmium(II) complexes with phosphine tellurides: synthesis and multinuclear (31P, 125Te, and 113Cd) NMR characterization in solution

New cadmium(II) complexes with phosphine telluride ligands of the type CdX2(R3PTe)(n) [X = ClO4-, n = 4: R = n-Bu (1), Me2N (2), C5H10N (3), C4H8N (4) or OC4H8N (5); X = Cl-, n = 2: R = n-Bu (6), Me2N (7), C5H10N (8), C4H8N (9) or OC4H8N (10)] have been synthesized and characterized by elemental analyses, IR and multinuclear (P-31, Te-125, and Cd-113) NMR spectroscopy. In particular, the solution structures of these complexes were confirmed by Cd-113 NMR at low temperature, which displays a quintuplet for each of the perchlorate complexes and a triplet for each of the chloride complexes due to coupling with four and two equivalent phosphorus atoms, respectively, indicating a four-coordinate tetrahedral geometry for the metal center. These multiplet features were further accompanied by one bond Te-Cd couplings, clearly showing that the ligand is coordinated to the metal through tellurium. The results are discussed and compared with those obtained for closely related phosphine chalcogenide analogs.