A. Reis, C. Willi, S. Siegel
Jul 1, 1979
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Influential Citations
12
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Journal
Inorganic Chemistry
Abstract
Bis(..mu..-acetato)-bis(norbornadiene)dirhodium(I) has been structurally characterized. The compound has been shown to be an active catalyst for the isomerization of quadricyclane to norbornadiene. This material crystallizes in the centrosymmetric monoclinic space group P2/sub 1//c with unit cell constants (T = 20/sup 0/C) a = 9.7733 (10) A, b = 15.2859 (15) A, c = 12.1815 (14) A, and ..beta.. = 103.563 (8)/sup 0/. All 3151 unique reflections were used in the x-ray structure analysis which refined to an R/sub F/ of 0.028. The Rh(1)--Rh(2) distance is 3.1050 (7) A. Each Rh atom is bonded to two oletin moieties of a norbornadiene ligand and to two oxygen atoms of the bridging acetate ligands. Each Rh coordination sphere has two approximate square-planar configuration with average Rh--oletin and Rh--O distances of 1.975 (4) and 2.106 (7) A, respectively. The Rh atoms lie 0.098 and 0.157 A out of their respective coordination planes. The dihedral angle formed between these planes is 50.1/sup 0/, while the angle between the planes defined only by the Rh and acetate oxygens is 40.2/sup 0/. Hydrogen atoms on the norbornadiene groups are within van der Waals contact distances, indicative of strong steric interactions between the ligands of the dimer. 4more » figures, 8 tables.« less