- 作者: 吳慧芬 ; 陳立偉
- 作者服務機構: 淡江大學化學系
- 中文摘要: Complexations of crown ethers with alkali metal ions have been investigated extensively by FAB mass spectrometry over the past decade, but very little attention has been paid to reactions of crown ethers with other classes of metal ions such as alkaline earth metal ions, transition metal ions and aluminum ions. Although fast atom bombardment ionization mass spectrometry has proven to be a rapid and convenient method to determine the binding interactions of crown ethers with metal ions, problems in reliabilities for quantitative measurements of binding strength for the host-guest complexes have been described in the literature. Thus, in this paper, applications of FAB/MS for investigating the complexation of crown ethers with various classes of metal ions is discussed. Extensive fragmentations for neutral losses such as C/sub 2/H/sub 4/O or C/sub 2/H/sub 4/ molecules from the host-guest complexes could be observed. The reason is attributed to the energetic bombardment processes of FAB occurring in the formation of these complexes. Complexes of cyclen with metal ions also show neutral losses of C/sub 2/H/sub 4/NH molecules leading to fragment ions. Transition metal ions usually form (Crown + MCI)/sup +/ type of ions, alkaline earth metal ions can form both(Crown + MCI)/sup +/ and (Crown + MOH)/sup +/ type of ions. But for aluminum ions, only (Crown + Al(OH)/sub 2/)/sup +/ type of ions could be observed.
- 英文摘要: --
- 中文關鍵字: Fast Atom Bombardment Mass Spectrometry; Host Guest Complexation; Hydration; Matrix Competition Effect; Crown Ether; Protonated Ion
- 英文關鍵字: 快速原子撞擊質譜;主客錯合;水合;基質競爭效應;冠醚;質子化離子