Rhodium phosphinoether complexes. Part 2. Crystal and molecular structures of trans-[1,8-bis(diphenylphosphino)-3,6-dioxaoctane-P,P′]-carbonyl(ethanol)rhodium(I) hexafluorophosphate and trans-[1,5-bis(diphenylphosphino)-3-oxapentane-P,P′]carbonylchlororhodium(I) dimer

Abstract

The crystal and molecular structures of the title compounds (1) and (2) have been determined. Compound (1) is monoclinic, space group P2₁/c, with a= 9.151(3), b= 11.047(2), c= 23.424(9)Å, β= 95.86(3)°, Z= 4, 2 369 observed reflections, R 0.070. The dimer (2) is orthorhombic, space group Pnma, a= 22.32(2), b= 29.97(2), c= 10.30(1)Å, Z= 4 (with ca. 3 molecules of CH₂Cl₂ per dimer), 1 149 observed reflections, R 0.114. Data were measured by diffractometer, and the structures solved by the heavy-atom method. In both, the phosphorus atoms are co-ordinated trans[Rh–P 2.335 and 2.32 Å], with CO [Rh–C 1.76 and 1.64 Å] and respectively EtOH and Cl [Rh–0 2.18, Rh–Cl 2.34 Å] as the other ligands. (1) has a monomeric stucture with ethanol encapsulated within the ring, but (2) is dimeric with the ligand chains fully extended.