Ion cyclotron resonance studies

This is not significantly different from the value of-91 kcal mol" derived by Sharpe from the data given by Bills and Cotton. It indicates that the value of-71 kcal mol", derived from Altshuller s measurements, is seriously in error. Beauchamp, in his ion cyclotron resonance study for the electron affinity of UF, used this latter value. With sub-... 

V. Kovacik, J. Hirsch, D. Tholmann, and H.-F. Griitzmacher, Fourier transform ion cyclotron resonance study of ion-molecule reactions of [M-OCFy1" ions of methyl 2,3,4,6-tetra-O-methyl-D-hexopyranosides with ammonia, Org. Mass. Spectrom., 26 (1991) 1085-1088. 

R. P. Clow and J.H. Futrell, Ion-cyclotron resonance study of the kinetic energy dependence of ion-molecule reaction rates. I. Methane, hydrogen, and rare gas-hydrogen systems, Int. J. Mass Spectrom. Ion Phys. 4, 165-179 (1970). 

Breuker, K. Oh, H. Cerda, B. Horn, D.M. McLafferty, F.W. Hydrogen atom loss in ECD A Fourier transform ion cyclotron resonance study with single isotopomeric ions. Eur. J. Mass Spectrom. 2002, 8, 177-180. 

An ion cyclotron resonance study of ion-molecule reactions in benzene has shown that the cyclopropenyl cation arises from a a-type complex between protonated benzene and benzene. The mass spectral fragmentation of cyclopropanol monoethers has been examined and subjected to theoretical study and the fragmentation of a series of underivatized aminocyclitol-aminoglycoside antibiotics is believed to involve the ion (387). The chemical ionization mass spectrum of oct-6-en-3-one has been interpreted as involving the cyclobutyl-cyclopropylcarbinyl cation rearrangement (388)- (389). ... 

The cation-TT interaction involves binding of a cation to Ji-electrons (e.g., benzene, acetylene). Early mass spectrometry and ion cyclotron resonance studies have established that alkali-metal cations (e.g., Na+) bind strongly to simple aromatics. Later, Deakyne, and Meolner showed that organic ions (e.g., alkylammoniums) display affinities for aromatics. Moreover, extensive work by Dougherty and CO workers has established models of the cation- n- interaction that have been successfully demonstrated in a variety of synthetic receptors. ... 

Staley RH, Wieting RD, Beauchamp JL. Carbenium ion stabilities in the gas phase and solution. An ion cyclotron resonance study of bromide transfer reactions involving alkali ions, alkyl carbenium ions, acyl cations, and cyclic halonium ions. J Am Chem Soc. 1977 99 5964-72. 

Ion cyclotron resonance studies of 3-methoxyalkanethiols and homologous sulphides MeO(CH2) SMe (n = 1—3/ have provided information on the reactivity profile of the methoxymethyl cation towards alcohols, thiols, and amines, and on the preferential abstraction of hydride ion from the carbon atoms that are alpha to sulphur (confirming that, in gas-phase reactions, S is more able than O to stabilize a neighbouring carbonium ion). Gas-phase acidities of dimethyl sulphoxide and representative aliphatic sulphones reveal a lower degree of stabilization of the cr-sulphonyl carbonium ions. ... 

The effect of pressure on the rate constant for reaction 5 was examined qualitatively In an Ion cyclotron resonance study O), and It was found that the average rate constant decreases as the pressure Is Increased, as one would expect for an endothermic reaction. 

The energetics of propane C-H and C-C activation by gas phase Fe+ and Ni+ has been investigated and suggested initial C-H insertion.22 An ion cyclotron resonance study of remote C-H bond activation in aliphatic nitriles by [FeMe]+ shows end on nitrogen coordination and activation of the (0, (w-l), and (o)-2) positions.23... 

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