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Synthesis and X-ray structure of (η-C5H5)2W2Ir2(CO)7(CHCO2Et)2, a tetrahedral heterometal cluster with two different environments for ethylcarboxylatocarbene ligands |
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| Authors: | Melvyn Rowen Churchill Linda Vollaro Biondi |
| Institution: | Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14214 U.S.A. Department of Chemistry and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801 U.S.A. |
| Abstract: | The tetrahedral heteronuclear cluster complex (η5-C5H5)2W2Ir2(CO)10 reacts with N2CHCO2R (R = Et, Me) at room temperature to form the dicarbene species (η5-C5H5)2W2Ir2(CO)7(CHCO2R)2. An X-ray diffraction study (R = Et) shows an intact tetrahedral metal framework with two distinct sites for the CHCO2Et ligands. The first uses its carbon atom to bridge the Ir---Ir bond; the second uses its carbon atom to bridge an Ir---W bond and, additionally, forms a donor bond from a carbonyl oxygen atom to the second tungsten atom. |
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