Reactions of Co+, Ni+, and Cu+ with Cyclopropane and Ethylene Oxide. Metal-Methylidene Ion Bond Energies

Article abstract of DOI:10.1021/j100367a083

The reactions of atomic cobalt, nickel, and copper ions with cyclopropane and ethylene oxide have been studied by using guided ion beam mass spectrometry.A predominant process in all these systems is formation of MCH2+.Analyses of these endothermic reactions yield the bond energies D⁰ (Co+-CH2) = 77.5 +/- 2.3 kcal/mol, D⁰ (Ni+-CH2) = 75.2 +/- 1.8 kcal/mol, and D⁰ (Cu+-CH2) = 63.9 +/- 1.6 kcal/mol.Differences between these values and those derived from earlier studies for Co+ and Ni+ are discussed.In addition to D⁰ (M+-CH2), bond energies for Co+-H, M-H (M = Co, Ni, Cu) and M+-O and M-O (M = Co, Ni) are evaluated and lower limits are placed on D⁰ (M+-C2H4) and D⁰ (M+-C2H2) (M = Co, Ni, Cu).The reaction mechanism for these reactions is also discussed in detail.