16610-75-6Relevant academic research and scientific papers
Ion Beam Studies of the Reactions of Atomic Cobalt Ions with Alkanes: Determination of Metal-Hydrogen and Metal-Carbon Bond Energies and an Examination of the Mechanism by which Transition Metals Cleave Carbon-Carbon Bonds
Armentrout, P.B.,Beauchamp, J. L.
, p. 784 - 791 (1981)
An ion beam apparatus is employed to study the reactions of singly charged cobalt positive ions with hydrogen and 17 alkanes.Reaction cross sections and product distributions as a function of kinetic energy are determined.Exothermic carbon-carbon bond cleavage reactions are observed for all alkanes but methane and ethane.A mechanism involving oxidative addition of C-C and C-H bonds to cobalt as a first step is demonstrated to account for all major reactions at all energies.Interpretation of several endothermic processes allows the extraction of thermochemical data.The bond dissociation energies obtained are Do(Co+-H)=52+/-4 kcal/mol, Do(Co-H)=39+/-6 kcal/mol, Do(Co+-CH3)=61+/-4 kcal/mol, and Do(Co-CH3)=41+/-10 kcal/mol.
Neutral and Ionic Metal-Hydrogen and Metal-Carbon Bond Energies: Reactions of Co+, Ni+, and Cu+ with Ethane, Propane, Methylpropane, and Dimethylpropane
Georgiadis, R.,Fisher, Ellen R.,Armentrout, P.B.
, p. 4251 - 4262 (2007/10/02)
The reactions of Co+, Ni+, and Cu+ with a series of alkanes are examined by guided ion beam mass spectrometry.The emphasis of this study is on C-H and C-C bond cleavage channels from which bond dissociation energies for M-H, M-CH3, and M+-CH3 are derived from the endothermic reaction thresholds.For these three bond energies, we find values (in kilocalories per mole) of 46+/-3, 46+/-3, and 49.1+/-3.5, respectively, for M=Co; 58+/-3, 55+/-3, and 45.0+/-2.4, respectively, for M=Ni; 61+/-4, 58+/-2, 29.7+/-1.7, respectively, for M=Cu.Trends in the thermochemistryof these species and M+-H are briefly discussed.The reactivity of Cu+, which has not been previously studied, is compared with that for other transition-metal ions.Also, unusual features in the reactivity of Co+ and Ni+ that have not previously been commented on are discussed.
