12542-67-5Relevant articles and documents
Ion chemistry in XH4/allene (X = Ge, Si) gaseous mixtures - Formation of X-C bonds
Benzi, Paola,Operti, Lorenza,Rabezzana, Roberto
, p. 505 - 512 (2000)
The gas-phase ion chemistry of germane/allene and silane/allene mixtures has been studied, with the aim of obtaining information on the experimental conditions leading to the formation of clusters of increasing size containing Ge or Si bonded to carbon atoms. Mechanisms of ion/molecule reactions have been elucidated by ion-trap mass spectrometry using single and multiple isolation steps. Rate constants for the most important reactions have been determined experimentally and compared with collisional rate constants. The germane/allene mixtures display a low reactivity and the most abundant germanium and carbon containing ion is GeCH3/+. However, chain propagation proceeds after the first nucleation step, even if rather slowly, with the formation of large clusters such as Ge4C3H3/+ at low abundance. In contrast, the silane/allene mixtures are very reactive and many different processes are observed, with the formation of several silicon and carbon containing ions with appreciable efficiency. Chain propagation proceeds mainly through reactions of silicon-containing ions with allene molecules and the subsequent formation of large clusters such as Si3C3H5/+ and Si4C3H7/+.
Reactions of CH3+ with C2N2, CH2CHCN, and HC3N: A low-pressure/high-pressure study
McEwan,Fairley,Scott,Anicich
, p. 4032 - 4037 (2007/10/03)
The association of CH3+ with the three molecules C2N2, CH2CHCN, and HCCCN has been examined using ion cyclotron resonance (ICR) and selected ion flow tube (SIFT) techniques at room temperature. In each reaction, the mean lifetime of the complex (CH3·N≡C-R+)* formed in the association has a major influence on the outcome of the reaction and the product channels that are observed using ICR and SIFT. Termolecular rate coefficients are reported for the association of CH3+ + C2N2 for the bath gases M = He, Ar, N2, and C2N2. k3 = 8.2 × 10-24 cm6 s-1 (M = C2N2). In each system the association product channel occurs in competition with exothermic bimolecular channels. The complex lifetimes in all three systems are in the range 30-70 μs. Very rapid ion-molecule association reactions have been observed in several systems of hydrocarbons and nitriles, and the implications for Titan ion chemistry are discussed briefly.
The Study of Ion-Molecule Reactions in the Gas Phase using a Triple Quadrupole Mass Spectrometer. Part 1. The Reactions of CH3+, CD3+, and C2H5+ with Simple Olefins
Batey, Jonathan H.,Tedder, John M.
, p. 1263 - 1268 (2007/10/02)
A triple quadrupole mass spectrometer has been used to study the reactions of simple carbocations with low molecular weight olefins in the gas phase at relatively high pressures (1E-3-1E-4 Torr).In each case a high energy 'addition complex' is formed which fragments spontaneously to give daughter ions, the extent of fragmentation depending to some extent on the pressure and on the translational energy of the primary ions.Also formed are 'second generation' ions due to reactions of the predominant daughter ions with the olefin.Ions with the same mass as the high energy 'addition complexes' have been fragmented by collision (C.I.D.) with inert molecules (N2) to yield similar daughter ions to those found from the 'addition complexes'.In the reactions, involving CD3+ ions, deuterium is widely, but not completely randomly, distributed among the daughter ions.
