Crystal and molecular structures of the organometallic species [Rh₂(bim)₂(cod)₂]Cl₂∙2H₂O [bim=bis-(1-imidazolyl)methane; cod=1, 5-cyclooctadiene]

Abstract

The synthesis and X-ray powder diffraction data for the organometallic [Rh2(bim)2(cod)2]Cl2∙2H2O species are reported. Its crystal and molecular structures were determined by simulated annealing and full-profile Rietveld refinement methods. [Rh2(bim)2(cod)2]Cl2∙2H2O was found to crystallize in the orthorhombic Cmca space group. The lattice parameters were determined to be a=21.3574(6), b=10.7764(3), c=14.2795(4) Å, V=3286.5(2) Å3, for Z=4. The crystal structure was found to contain dimeric [Rh2(bim)2(cod)2]2+ cations, in which the bim ligands bridge Rh(cod) fragments with an intermetallic separation of ca. 8.90 Å. The crystal structure is completed by chloride ions and hydrogen-bonded water molecules, situated in the small cavities of the large cation substructure. The conformation of the bim ligand, lying on a crystallographic mirror plane, is rigorously Cs.

Structures from Powders: Polynuclear Hg(II) Complexes Containing the Flexible Bisimidazolylmethane Ligand

“…Similar cyclic oligomers have been found for zinc (another group 12 metal) and rhodium, but not for cadmium complexes . Moreover, zinc dimers containing halides (Cl, Br) as ancillary ligands resulted to be very different from the corresponding acetate, which showed a one-dimensional chain topology (thus not crystallizing as discrete entities).…”

The crystal structure of bis(imidazole-1-yl)methane monohydrate, C7H10N4O

“…The synthesis of bisimidazole methane coordination polymers has attracted great interest. Many compounds with novel structures and special functions have been synthesized by self-assembly method [6][7][8][9]. The crystal structure of bis(imidazole-1-yl)methane has been reported [10].…”