کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1171937 | 960737 | 2006 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Chemical shifts as a novel measure of interactions between two binding sites of symmetric dialkyldimethylammonium bromides to α-cyclodextrin
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
Complex formation of α-cyclodextrin (α-CD) with decyltrimethylammonium (DeTAB), N,N-dioctyldimethylammonium (DOAB), and N,N-didecyldimethylammonium bromides (DDeAB) was investigated by proton NMR spectroscopy. Analysis of chemical shifts yielded macroscopic 1:1 and 1:2 binding constants (K1 and K2) and chemical shift differences (ÎδSD and ÎδSD2) for the 1:1 and 1:2 complexes of DeTAB, DOAB, and DDeAB with α-CD. The K1 and K2 values of DDeAB were quantitatively explained on the basis of the assumption that the microscopic 1:1 binding constant of DDeAB is identical to the observed K1 value of DeTAB. The K2 value of DDeAB was also explained in terms of its observed K1 value and the independent binding of two alkyl chains. Furthermore, the ÎδSD and ÎδSD2 values for protons of DDeAB and α-CD were quantitatively explained on the basis of the assumption that the geometry of the decyl group of DDeAB in an α-CD cavity is identical to that of DeTAB. The ÎδSD value was also explicable on the basis of the same geometric assumption and the observed ÎδSD2 value for this system. Similar results were obtained for the 1:1 and 1:2 DOAB-α-CD complexes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 555, Issue 2, 12 January 2006, Pages 278-285
Journal: Analytica Chimica Acta - Volume 555, Issue 2, 12 January 2006, Pages 278-285
نویسندگان
Noriaki Funasaki, Seiji Ishikawa, Shun Hirota,