158019-99-9Relevant academic research and scientific papers
Enthalpies of reaction of CpRu(COD)Cl (Cp = η5-C5H5; COD = cyclooctadiene) with chelating tertiary phosphine ligands. Solution thermochemical investigation of ligand substitution and ring strain energies in CpRu(R2P(CH2)nPR2)Cl complexes
Li, Chunbang,Cucullu, Michèle E.,McIntyre, Robert A.,Stevens, Edwin D.,Nolan, Steven P.
, p. 3621 - 3627 (2008/10/08)
The enthalpies of reaction of CpRu(COD)Cl (Cp = η5-C5H5; COD = η4-cyclooctadiene) with a series of bidentate ligands, leading to the formation of CpRu(PP)Cl complexes, have been measured by anaerobic solution calorimetry in THF at 30.0°C. The overall relative order of stability established for these complexes is as follows: dppm a quantitative treatment of ring strain enthalpies in these organoruthenium metallacyclic compounds. Significant ring strain energy is displayed in the four-membered metallacycle and is on the order of 13 kcal/mol. A single crystal X-ray diffraction study has been performed on one of the new complexes, CpRu-(dppv)Cl [dppv = bis(diphenylphosphino)ethylene] (C31H27ClP2Ru·CH2Cl 2, P1, a = 10.344-(2) A?, b = 11.907(2) A?, c = 13.183(1) A?, α = 67.89(1)°, β = 76.52(1)°, γ = 85.96(2)°, V = 1462.5(5) A?3, and Z = 2). Comparisons of the thermochemical data with the C5Me5-based system and related metallacyclic complexes are also presented.
