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

Abstract

New cadmium(II) complexes with phosphine telluride ligands of the type CdX2(R3PTe)n [X = ClO4−, n = 4: R = n-Bu (1), Me2 N (2), C5H10 N (3), C4H8 N (4) or OC4H8 N (5); X = Cl–, n = 2: R = n-Bu (6), Me2 N (7), C5H10 N (8), C4H8 N (9) or OC4H8 N (10)] have been synthesized and characterized by elemental analyses, IR and multinuclear (31P, 125Te, and 113Cd) NMR spectroscopy. In particular, the solution structures of these complexes were confirmed by 113Cd 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.