Unusual mixed-metal carbonate-bridged complexes via oxidation of a carbonyl ligand in [RhM(CO)4(Ph2PCH2PPh2)2] (M = Mn, Re) and [IrRe(CO)5(Ph2PCH2PPh2)2]
作者:David M. Antonelli、Martin Cowie
DOI:10.1021/om00053a020
日期:1991.7
The complexes [RhM(CO)4(dppm)2] (M = Mn (1), Re (2); dppm = Ph2PCH2PPh2) and [IrRe(CO)5(dppm)2] (3) react with molecular oxygen to give the corresponding carbonate complexes [RhM(CO)3(mu-CO3)(dppm)2] (M = Mn (4), Re (5)) and [IrRe(CO)3(mu-CO3)(dppm)2] (6). No intermediates were observed in these reactions even at -60-degrees-C. The X-ray structure determination of compound 4 shows that the carbonate ligand bridges the metals in a unique mu-2-eta-2 fashion in which one oxygen atom bridges the metals and another is also bound in Mn leaving one oxygen uncoordinated. Compound 4 crystallizes in the monoclinic space group C2/c with a = 35.591 (6) angstrom, b = 12.556 (3) angstrom, c = 25.277 (5) angstrom, beta = 116.46 (2)-degrees, V = 10112.8 angstrom 3, and Z = 8. The structure, which displays a 70:30 rotationally disordered ''RhMn(CO)3(mu-CO3)'' moiety, has refined to R = 0.079 and R(w) = 0.104 on the basis of 366 parameters refined and 2942 independent observations.