Dynamic behavior of [(η5-C5H4CH3)Cr(CO)2(μ-SBu)Pt(PPh3)2] in solution

The structure and dynamic behavior of complex [(η5-C5H4CH3)Cr(CO)2(μ-SBu)Pt(PPh3)2] in solution was studied by multinuclear (1H, 13C, 31P) NMR spectroscopy including a phase-sensitive NOESY experiment. Increasing temperature causes rupture of the Cr–Pt bond in the three-membered ring of the complex and rotation of the S–Pt(PPh3)2 unit around the Cr–S bond line, followed by formation of a new Cr–Pt bond to close the ring. All activation parameters for this dynamic process have been determined.