Intracluster ion-molecule reactions of Ti+ with C 2H5OH and CF3CH2OH clusters: Influence of fluorine substituents on chemical reactivity

Young Mi Koo, Tae Kyu Kim, Dong Woon Jung, Kwang Woo Jung

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A laser ablation-molecular beam/reflectron time-of-flight mass spectrometric technique was used to investigate the ion-molecule reactions that proceed within Ti+(ROH)n (R = C2H5, CF3CH2) heterocluster ions. The mass spectra exhibit a major sequence of cluster ions with the formula Ti+(OR) m(ROH)n (m = 1, 2), which is attributed to sequential insertions of Ti+ into the O-H bond of C2H5OH or CF3CH2OH molecules within the heteroclusters, followed by H eliminations. The TiO+ and TiOH+ ions produced from the reactions of Ti+ with C2H5OH are interpreted as arising from insertion of Ti+ into the C-O bond, followed by C2H5 and C2H6 eliminations, respectively. When Ti+ reacted with CF 3CH2OH, by contrast, considerable contributions from TiFOH+, TiF2+, and TiF2OH + ions were observed in the mass spectrum of the reaction products, indicating that F and OH abstractions are the dominant product channels. Ab initio calculations of the complex of Ti+ with 2,2,2-trifluoroethanol show that the minimum energy structure is that in which Ti+ is attached to the O atom and one of the three F atoms of 2,2,2-trifluoroethanol, forming a five-membered ring. Isotope-labeling experiments additionally show that the chemical reactivity of heterocluster ions is greatly influenced by the presence of fluorine substituents and cluster size. The reaction energetics and formation mechanisms of the observed heterocluster ions are discussed.

Original languageEnglish
Pages (from-to)13724-13730
Number of pages7
JournalJournal of Physical Chemistry A
Issue number51
Publication statusPublished - 2006 Dec 28

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry


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