کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1238894 968965 2005 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study of charge transfer complexes of [70]fullerene with phenol and substituted phenols
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Study of charge transfer complexes of [70]fullerene with phenol and substituted phenols
چکیده انگلیسی
To improve the understanding of the charge transfer (CT) interaction of [70]fullerene with electron donors, interaction of [70]fullerene with a series of phenols, e.g., phenol, resorcinol and p-quinol were studied in 1,4-dioxan medium using absorption spectroscopy. An absorption band due to CT transition was observed in the visible region. The experimental CT transition energies (hνCT) are well correlated (through Mulliken's equation) with the vertical ionisation potentials (IDv) of the series of phenols studied. From an analysis of this correlation degrees of charge transfer for the [70]fullerene-phenol complexes were estimated. The degrees of charge transfer in the ground state of the complexes have been found to be very low (<2%). The hνCT values change systematically as the number and position of the OH groups change on the aromatic ring of the phenol moiety. From the trends in the hνCT values, the Hückel parameters (hÖ and kCÖ) for the OH group were obtained in a straightforward way and the values so obtained, viz., 1.91 and 1.0, respectively, are close to the ones (1.8 and 0.8) recommended by Streitwieser on the basis of other evidence. Oscillator strengths, transition dipole strengths and resonance energies of the [70]fullerene-phenol complexes were determined. Formation constants of the CT complexes were determined at four different temperatures from which enthalpies and entropies of formation of the complexes were estimated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 61, Issue 9, July 2005, Pages 2065-2071
نویسندگان
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