BI- AND TRINUCLEAR CARBONYL RUTHENIUM CLUSTERS: A CRYSTALLOGRAPHIC AND ELECTRONIC COMPARATIVE STUDY. J. F. Van der Maelen Uría, D. Ardura, S. García-Granda (Dpto. Química Física y Analítica), J. A. Cabeza (Dpto. Química Orgánica e Inorgánica), Facultad de Química, Universidad de Oviedo, E-33006 Oviedo Spain

Results on the structure determination and molecular aspects of a series of Ru₃ cluster complexes are presented. Details on their potential significance as homogeneous catalysts, as well as their electronic structure in some cases, are also given. The study includes, among others, the following trinuclear compounds: [Ru₃(u-H)(u,[[eta]]²-o-SC₆H₄NH₂)(CO)₉] (o-HSC₆H₄NH₂=2-amino-thiophenol) [1], [PPN][Ru₃(u-dmpz)(u₃-Ph₂C₂)(u-CO)₂ (CO)₆] (Hdmpz = 3,5-dimethylpyrazole) [2], [Ru₃(u₃-ampy)(CO)₉ (PPh₃)][BF₄].C₅H₁₂ (Hampy = 2-amino-6-methylpyridine) [3], [Ru₃(u-H)(u₃-ampy)(u-[[eta]]¹:[[eta]]²-PhC=CHPh)(CO)₈][BF₄].CH₂Cl₂ [4], and [Ru₃(u-Ph)(u₃-ampy)(u-PPh₂)₂(CO)₆] [5]. Refinement procedures for the treatment of solvent and other disordered areas, as published elsewhere [6], will also be given. Finally, semiempirical electronic structure calculations for new binuclear compounds will be shown as well.

[1] J. A. Cabeza, M. A. Martínez-García, V. Riera, S. García-Granda, and J. F. Van der Maelen, J. Organomet. Chem., xx (1996), xxx-xxx (in the press).

[2] J. A. Cabeza, R. J. Franco, V. Riera, S. García-Granda, and J. F. Van der Maelen, Organometallics, 14 (1995), 3342-3348.

[3] J. A. Cabeza, I. del Río, A. Llamazares, V. Riera, S. García-Granda, and J. F. Van der Maelen, Inorg. Chem., 34 (1995), 1620-1623.

[4] J. A. Cabeza, J. M. Fernández-Colinas, A. Llamazares, V. Riera, S. García-Granda, and J. F. Van der Maelen, Organometallics, 13 (1994), 4352-4359.

[5] J. A. Cabeza, R. J. Franco, A. Llamazares, V. Riera, E. Pérez-Carreño, and J. F. Van der Maelen, Organometallics, 13 (1994), 55-59.

[6] J. F. Van der Maelen, and G. M. Sheldrick, Anal. Quim. (Int. Edit.), 92 (1996), 7-12.