Rhodium(I) dimethyl sulfoxide oxyquinolinato carbonyl complex, [Rh(Oxq)(CO)(DMSO)]. NMR and X-ray structure data

A new rhodium(I) dimethyl sulfoxide (DMSO) 8-oxyquinolinato (Oxq) complex, [Rh(Oxq)(CO)(DMSO)] (I), has been prepared and characterized by IR, 1H and 13C NMR, and X-ray data. DMSO is S-coordinated in the trans-N position. The values of ν(CO), carbonyl δ13С, as well as δ13С and δ1H of Oxq ligand for three L trans-N complexes, [RhOxq(CO)(L)] (L = NH3, DMSO, and CO), define the intermediate position of DMSO within the ligand L series ranged in their net donating potency. Observed spin–spin couplings of Oxq 13C (C2, C3, C4a, C7, C8a) and 1H (H2) nuclei to 103Rh provide one more tool to study long-range interactions of Oxq rings with metallocenter and remote ligand L.