Carbon-13 nuclear magnetic resonance studies of some organo-rhodium complexes

[摘要] This study was concerned with the analysis of bonding in rhodium(I) square planar complexes of the type RhCl(CO)L2 where L equals tertiary phosphine, arsine, stibine, and amine. Since Rh(I) complexes have been shown to be effective decarbonylation, carbonylation, and hydrogenation catalysts, an investigation of the bonding was in order to elucidate the bonding in these complexes. Previous studies have noted that infrared and nuclear magnetic resonance studies are helpful in determining the nature of the pi bonding in the complexes. With the advent of 13C NNR, a more direct technique of studying the bonding was available, in addition to the already available technique of infrared spectroscopy. The object of the study was then to determine the relationship of the carbon-13 chemical shift and the infrared carbonyl stretching frequency force constant for the compounds RhCl(CO)L2. The results of plotting thy chemical shift versus the force constant showed a linearity between the two factors. In addition, some new organo-rhodium complexes were synthesized.

[发布机构] Rice University