Synthesis and Characterization of NH-triazole-Bound Rhodium(I) Complexes: Substituted-Group-Controlled Regioselective Coordination

4,5-Disubstituted NH-1,2,3-triazoles (TRIA) were used to coordinate with Rh(I) metal cation, forming a new class of triazole-bridged [Rh(COD)(TRIA)](2) complexes in near-quantitative yields. X-ray crystallography studies revealed that the C-4-substituted groups effectively controlled the triazole binding sites, resulting in different coordination patterns. In addition, these air- and moisture-stable [Rh(COD)(TRIA)](2) complexes showed affective catalytic properties in Pauson-Khand reactions, with superior stability.