کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1244656 | 969694 | 2007 | 5 صفحه PDF | دانلود رایگان |
Upon addition of small amount of bromocyclohexane (BrCH), quinine (QN) and quinidine (QD) display strong room temperature phosphorescence (RTP) in γ-cyclodextrin (γ-CD) solution without deoxygenation. The associated phosphorescence decay curves can be best fitted to biexponential patterns and quite different RTP lifetimes are obtained for QN (86.9 and 12.5 ms) and QD (12.1 and 4.17 ms), indicating a distinct chiral discrimination of γ-CD toward this pair of pseudo-enantiomers. The corresponding association constants evaluated for QN/γ-CD/BrCH and QD/γ-CD/BrCH are 3.47 × 105 and 4.67 × 104 L mol−1, respectively. It can be inferred that their different ability to form complexes with the chiral γ-CD is accounted for the notable difference in RTP lifetimes between QN and QD.
Journal: Talanta - Volume 73, Issue 5, 31 October 2007, Pages 938–942