SYNTHESIS AND X-RAY STRUCTURE OF [(MU-H)OS3(CO)10(MU-ETA-2-N=CCH=CHCH=CC2H5)]

The reaction of [Os-3(CO)(10)(MeCN)(2)] with 2-ethylpyridine at ambien t temperature leads to the isolation of the cluster [(mu-H)Os-3(CO)(10 )(mu-eta(2)-N=CCH=CHCH=CC2H5)[3 (65% yield) which has been structurall y characterized by crystallographic methods. The compound crystallizes in the triclinic space group P (1) over bar with a = 9.334(2), b = 9. 918(2), c 11.767(1) Angstrom, alpha = 92.13(2), beta = 99.93(1), gamma = 99.88(2)degrees, V = 1054.7(3) Angstrom(3) and Z = 2. The same edge of the osmium triangle in the cluster is bridged by both the hydride and the heterocyclic ligands, the latter through the nitrogen and the carbon atoms of the C=N bond.