کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1235430 | 968847 | 2007 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Binding of dimethyl 2,3-naphthalenedicarboxylate with α-, β- and γ-cyclodextrins in aqueous solution
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
Fluorescence has been used to investigate the complexes of 2,3-dimethyl naphthalenedicarboxylate with naturally occurring α-, β- and γ-cyclodextrins. Emission spectra upon excitation of the naphthoate group show two peaks whose ratio of intensities R is the sensitive to the medium polarity. The change of R with cyclodextrin concentration and temperature allows us to obtain the stoichiometry, the formation constants and the changes of enthalpy and entropy upon inclusion. Complexes show 1:1 stoichiometry. R extrapolated at [CD] â â and the analysis of quenching and polarization measurements, as well as, molecular mechanics calculations in the presence of water, permit us to explain the geometry of the complexes, the possible location of the guest in conformity with thermodynamics parameters and the forces responsible for the complexation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 67, Issue 2, June 2007, Pages 420-429
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 67, Issue 2, June 2007, Pages 420-429
نویسندگان
Carolina Alvariza, Ruben Usero, Francisco Mendicuti,