96607-14-6Relevant articles and documents
Chemistry of H2O+ with C2F4, C2F6, and CF3X (X = F, Cl, Br, I)
Morris, Robert A.,Viggiano, A. A.,Doren, Jane M. Van,Paulson, John F.
, p. 3051 - 3054 (2007/10/02)
The reactions of H2O+ with CF4, C2F6, C2F4, CF3Cl, CF3Br, and CF3I have been studied at 300 and 499 K.The measurements were conducted using a variable-temperature-selected ion flow tube apparatus.H2O+ reacts via charge transfer with C2F4 with rate constants equal to 1.4 x 10-9 and 1.5 x 10-9 cm3 s-1 at 300 and 499 K, respectively.The reactions with CF3X (X = Cl, Br, I) all proceed at the collision rate at 300 and 499 K within experimental uncertainty.The rate constants are in the range 1.6 x 10-9 - 2.1 x 10-9 cm3 s-1.The reactions of H2O+ with CF3X produce CF3+ and CF2X+ for X = Cl, Br, I, CF2OH+ for X = Cl, Br, and CF3X+ for X = Br, I.The reaction with CF3Cl also forms the ionic product CF3OH2+.No reaction was observed between H2O+ and the reactant neutrals CF4 and C2F6; the rate constants are less than 5 x 10-12 cm3 s-1 at 300 and 499 K.Upper limits to the heats of formation of CF2Cl+, CF2Br+, and CF2I+ have been derived from the data and are -1, respectively.
Chemistry of CFn(1+) (n = 1-3) Ions with Halocarbons
Morris, Robert A.,Viggiano, A. A.,Doren, Jane M. Van,Paulson, John F.
, p. 2597 - 2603 (2007/10/02)
The gas-phase reactions of CF(1+), CF2(1+), and CF3(1+) with the halocarbons CF3Cl, CF3Br, CF3I, CF4, and C2F6 have been studied using a variable-temperature-selected ion flow tube (VT-SIFT) instrument at 300 and 496 K.The ion CF(1+) reacts rapidly with CF3X (X = Cl, Br, I) producing the ions CF2X(1+).In the reaction of CF(1+) with CF3Cl, CF3(1+) is also produced as a minor product.Curvature was observed in the pseudo-first-order kinetics plots for the reactions of CF(1+) with CF4 and C2F6.In both cases the curvature is attributed to the presence of two or more CF(1+) states (probably vibrational) of differing reactivities toward the perfluorocarbon of interest.This conclusion is supported by our observation of charge transfer from CF(1+) to NO, a reaction which is endothermic by 15 kJ/mol for the ground state of CF(1+).CF(1+) is unreactive with O2, N2, and Xe.The reactions of CF2(1+) with CF3X yield CF3(1+) and CF2X(1+) for X = Cl and Br; for X = I, CF2I(1+) and CF3I(1+) are produced.The overall reactions proceed at approximately the collision rate at 300 and 496 K, and the branching ratios are not strongly dependent on temperature.The reactions of CF2(1+) with CF4 and C2F6 produce CF3(1+) and C2F5(1+), respectively.The rate constants decrease significantly with increasing temperature.CF2(1+) reacts rapidly by charge transfer with NO.The reaction of CF2(1+) with O2, producing CF2O(1+), is inefficient.CF2(1+) is unreactive with N2.CF3(1+) reacts with CF3X (X = Cl, Br, I) at rates below the collision values, producing a single ionic product, CF2X(1+).While the rate constants for the reactions of CF3(1+) with CF3X increase in the series with increasing CF3X mass, the rate constants for reaction with each CF3X decrease sharply with increasing temperature.A mechanism is proposed in which the reaction proceeds on a double-well potential energy surface.No reaction was observed for the CF3(1+)/CF4 system.CF3(1+) appeared to react very slowly with C2F6 and NO, producing C2F5(1+) and NO(1+), respectively, but reactions with impurities in the neutral reagents cannot be ruled out as the source of these ions.CF3(1+) is unreactive with O2 and N2.
