1,3-Bis(2-Ethoxyphenyl)Imidazolidin-2-Ylidene]Bromo(Cycloocta-1,5-Diene)Rhodium(I)

Abstract

The title complex, [RhBr(C<inf>8</inf>H<inf>12</inf>)(C<inf>19</inf>H <inf>22</inf>N<inf>2</inf>O<inf>2</inf>)], has a distorted square-planar geometry. There are two molecules, A and B, in the asymmetric unit. The Rh-C bond distance between the N-heterocyclic ligand and the metal atom is 2.039 (2) Å in molecule A and 2.042 (2) Å in molecule B. The angle between the carbene heterocycle and the coordination plane is 87.56 (12)° in molecule A and 87.03 (11)° in molecule B. It is shown that the average Rh-C(COD) (COD is cyclooctadiene) distance is linearly dependent on the Rh-C(imidazolidine) distance in this type of compound. This can be ascribed to the steric hindrance produced by the packing. The crystal structure contains intramolecular C-H⋯O and intermolecular C-H⋯Br interactions. © 2005 International Union of Crystallography.