Synthesis and NMR investigation of dirhodium(4+) formamidinate complexes containing 2-(diphenylphosphino)pyridine as a bridging ligand. X-ray crystal structure of the complex Rh2(form)2(.mu.-PPh2Py)2(O2CCF3)2 (form = N,N'-di-p-tolylformamidinate)

Abstract

The Rh 2 4+ complex Rh 2 (form) 2 (O 2 CCF 3 ) 2 (H 2 O) 2 (form=N,N'-di-p-tolylformamidinate) reacts with 2-(diphenylphosphino)-pyridine, giving the complexes Rh 2 (form) 2 (μ-O 2 CCF 3 )(μ-PPh 2 Py)(O 2 CCF 3 ) (1) and Rh 2 (form) 2 (μ-PPh 2 Py) 2 (O 2 CCF 3 ) 2 (2), respectively. The complexes were characterized by IR and 1 H and 31 P NMR spectroscopy. Both complexes exhibit a «lantern» type structure with the axial sites occupied by one or two monoligated trifluoroacetate groups, respectively. Complex 2 was also characterized by single-crystal X-ray diffraction analysis, crystallizing in the monoclinic space group P2 1 /n