| Abstract
| - Doubly charged lead monohydrate, [Pb(H2O)]2+, was predicted to be unstable in the gas phase, but it hasrecently been observed to form in low yield via ligand change between [Pb(CH3CN)]2+ and H2O [Shi, T.;Orlova, G.; Guo, J.; Bohme, D. K.; Hopkinson, A. C.; Siu, K. W. M. J. Am. Chem. Soc.2004, 126, 7975−7980]. Here we report that abundant [Pb(H2O)]2+ is formed in the gas phase by ligand-exchange reactionbetween [Pb(N2)n]2+ (n = 1−3) and water after collisional activation. Density functional theory has beenused to examine the ligand-exchange reaction profile. A comparison of the potential-energy surfaces between[Pb(N2)]2+ and [Pb(CH3CN)]2+ reacting with H2O provides strong evidence that the ligand-exchange reactionof [Pb(N2)]2+ with H2O to form [Pb(H2O)]2+ is more efficient than that of [Pb(CH3CN)]2+ with H2O.
|
