Synthesis and characterization of rhodium complexes containing atropisomeric sulfur ligands. Structure of [{Rh2(µ-L)(CO)3[P(OC6H4But-o)3]}2](H2L = 1,1′-binaphthalene-2,2′-dithiol)

Abstract

The addition of the atropisomeric racemic sulfur compound 1,1′-binaphthalene-2,2′-dithiol (H₂L) to a dichloromethane solution of [{Rh(µ-OMe)(cod)}₂](cod = cycloocta-1,5-diene) afforded the dithiolate-bridged complexes [{Rh₂(µ-L)(cod)₂}_n](n= 2 1 or 1 2). These reacted with carbon monoxide to give the dinuclear tetracarbonyl complex [Rh₂(µ-L)(CO)₄]3. The reaction of 3 with PR₃ provided the mixed-ligand complexes [{Rh₂(µ-L)(CO)₂(PR₃)₂}₂](R = Ph 4 or C₆H₁₁5) and [{Rh₂(µ-L)(CO)₃(PR₃)}₂]6[R = P(OC₆H₄Bu^t-o)₃]. The crystal structure of 6 was determined by X-ray diffraction.