淡江大學機構典藏:Item 987654321/61533
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    題名: Comparison of the orders of gas-phase basicities and ammonium ion affinities of polyethers by the kinetic method and ligand exchange technique
    作者: Wu, H. F.;吳慧芬;Brodbelt, J. S.
    貢獻者: 淡江大學化學學系
    日期: 1993-09-01
    上傳時間: 2011-10-15 23:14:19 (UTC+8)
    摘要: The orders of relative gas-phase basicities and ammonium ion affinities of a series of polyethers obtained by application of the kinetics method and ligand exchange technique are compared to evaluate the discrepancies of results between the two techniques. The order of gas-phase basicities determined by the ligand exchange technique in a quadrupole ion trap agrees with the order established previously by Kebarle using equilibrium methods in a high-pressure mass spectrometer. The order obtained by the kinetic method in a triple quadrupole mass spectrometer varies for the ranking of one polyether (12-crown-4), and this discrepancy is attributed to a difference in the rates of the competing dissociation pathways from the triethylene glycol dimethyl ether/12-crown-4 proton-bound adduct, owing to a substantial variation in the flexibilities of these two ethers. For the order of gas-phase ammonium ion affinities, the kinetic method results agree overall with the ligand exchange results; however, the order of ammonium ion affinities for tetraethylene glycol dimethyl ether and 15-crown-5 could not be differentiated by the ligand exchange method because of the rapidity of ammonium ion transfer between the two polyethers in both directions.
    關聯: Journal of the American society for mass spectrometry4, pp.718-722
    DOI: 10.1016/1044-0305(93)80050-9
    顯示於類別:[化學學系暨研究所] 期刊論文

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