引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
过刊浏览    高级检索
本文已被:浏览 23次   下载 49  
分享到: 微信 更多
F(H2O)+CH3I ligand exchange reaction dynamics
RolandWester
Institut für Ionenphysik und Angewandte Physik, Universit?t Innsbruck, Technikerstra?e 25, 6020 Innsbruck, Austria
Abstract:
Single hydration of the gas phase F + CH3I I + CH3F reaction allows to probe solvent eects on a fundamental nucleophilic substitution reaction. At the same time, the addition of a solvent molecule opens alternative product channels. Here, we present crossed beam imaging results on the dynamics of the F(H2O) + CH3I [FCH3I] + H2O ligand exchange pathway at collision energies between 0:3 and 2:6 eV. Product kinetic energies are constrained by the stability requirement of the weakly bound product complexes. This implies substantial internal excitation of the water molecule and disfavors ecient energy redistribution in an intermediate complex, which is reected by the suppression of low kinetic energies as collision energy increases. At 0:3 eV, internal nucleophilic displacement is important and is discussed in light of the competing nucleophilic substitution pathways that form I and I(H2O).
Key words:  reaction dynamics, ligand exchange, microsolvation, crossed beams, velocity map imaging
FundProject:
F(H2O)+CH3I ligand exchange reaction dynamics
RolandWester
Institut für Ionenphysik und Angewandte Physik, Universit?t Innsbruck, Technikerstra?e 25, 6020 Innsbruck, Austria
摘要:
Single hydration of the gas phase F + CH3I I + CH3F reaction allows to probe solvent eects on a fundamental nucleophilic substitution reaction. At the same time, the addition of a solvent molecule opens alternative product channels. Here, we present crossed beam imaging results on the dynamics of the F(H2O) + CH3I [FCH3I] + H2O ligand exchange pathway at collision energies between 0:3 and 2:6 eV. Product kinetic energies are constrained by the stability requirement of the weakly bound product complexes. This implies substantial internal excitation of the water molecule and disfavors ecient energy redistribution in an intermediate complex, which is reected by the suppression of low kinetic energies as collision energy increases. At 0:3 eV, internal nucleophilic displacement is important and is discussed in light of the competing nucleophilic substitution pathways that form I and I(H2O).
关键词:  reaction dynamics, ligand exchange, microsolvation, crossed beams, velocity map imaging
DOI:
分类号: