Acta Cryst. (2002). E58, m363-m365  [ doi:10.1107/S1600536802010838 ]

Tris[bis(diphenylphosphino)methane-²P,P']rhenium(I) perrhenate

K. H. Whitmire, D. R. Derringer and K. R. Kongkasuwan

Abstract: A reaction was carried out to make trans-[Re₂{O₂C-3,5-(OH)₂C₆H₃}₂Br₂(dppm)₂] (dppm is Ph₂PCH₂PPh₂). No trans-[Re₂{O₂C-3,5-(OH)₂C₆H₃}₂Br₂(dppm)₂] was isolated, however, and a very small quantity of crystalline [Re(dppm)₃][ReO₄] was obtained after several months. A product of decomposition by disproportionation of a complex of dirhenium, [Re(dppm)₃]ReO₄ is an ionic compound that contains a complex cation of Re^I bonded to three chelating dppm ligands. Although complexes that contain three chelating dppm ligands are very rare, this is the second time [Re(dppm)₃]⁺ has been observed and characterized structurally. In 2000, [Re(dppm)₃]⁺, with I^- as the counter-ion, was structurally characterized [Rivero et al. (2000). Polyhedron, 19, 2249-2254]. The Re-P distances in the compound we characterized range from 2.408  (3) to 2.473  (3)  Å, and the P-Re-P angles, associated with the chelate rings, range from 68.22  (12) to 70.04  (12)°. These values are very similar to those reported by Rivero et al. (2000).

Online 29 June 2002

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