Synthesis, characterization and crystal structure of dicarbonyl(syn-η3-2,4-pentadienyl)triphenylphosphinecobalt

[[abstract]]The reaction of NaCo(CO)4 with trans-1-bromppenta-2,4-diene in tetrahydrofuran at −78°C affords (syn-η3-2,4-pentadienyl)Co(CO)3 (1) in moderate yield. Addition of triphenylphosphine to 1 in ether at 0°C gives (syn-η3-2,4-pentadienyl)Co(CO)2[P(C6H5)3] (2a). In solution, 2a equilibrates with its anti isomer (2b) at room temperature. The crystal structure of 2a has been determined by X-ray diffraction analysis. Compound 2a crystallizes in the triclinic space group P with lattice parameters: a 10.326(2), b 10.763(4), c 11.452(2) Å, α 105.99(2), β 100.10(1), γ 108.05(2)°; V 1114.98 Å3, Mol. wt. 539.69, D (calcd.) 1.324 g/cm3 and Z = 2. The structure was solved and refined to R and Rw values of 0.0357 and 0.0408, respectively for 4046 reflections.[[fileno]]2010327010028[[department]]化學