Gilbert K. Yang

Application of time-resolved photoacoustic calorimetry to CrL bond enthalpies in Cr(CO)5L

Using time-resolved photoacoustic calorimetry, the CrL bond enthalpies in Cr(CO)5L for a variety of ligands have been measured. Also, the enthalpy and entropy of activation for the displacement of heptane in Cr(CO)5(heptane) by pyridine and 2-picoline have been determined.

Strength of the metal-ligand bond in LCr(CO)5 measured by photoacoustic calorimetry

Abstract The Cr-L bond strengths for Cr(CO)5L in heptane have been determined using photoacoustic calorimetry. For L = CO, PBu3, CH3CN and THF, ΔHBDE = 27.0, 21.6, 18.2, 12.4 kcal mol respectively. Comparison of the Cr-CO bond dissociation energies in the gas phase and in heptane solution suggests a 10 kcal mol stabilization of Cr(CO)5 by coordinated heptane.

Rearrangement of the phosphonium methyl iron complex [FeCp(CO)2CH2(PEt2H)]+ BPh4- by β-hydrogen elimination (Cp = cyclopentadienyl)

UV photolysis of the title compound yields FeCp(CO)2PEt2Me+ by β-elimination from the phosphonium methyl moiety with evidence for an intermediate η2-phosphmomethanide metal hydride complex.