کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1236990 1495291 2005 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Raman spectroscopic study of hydrogen bonding in benzenesulfonic acid/acrylonitrile solutions
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Raman spectroscopic study of hydrogen bonding in benzenesulfonic acid/acrylonitrile solutions
چکیده انگلیسی

Solutions of benzenesulfonic acid (BSA) in acrylonitrile in the range 1.02–6.53 mol dm−3 were studied by FT-Raman spectroscopy. Spectra in the region of the acid SOH and benzenesulfonate anion SO3 stretching bands were analysed by band-fitting procedures in order to ascertain the degree of acid dissociation. This parameter changes from 0.42 (1.02 M solution) to 0.185 (6.53 M solution) despite the strong character of the acid. Interaction of acrylonitrile with undissociated BSA produces a new band in the ν(CN) Raman spectral region, displaced +21.4 cm−1 and assigned to acrylonitrile molecules H-bonded to BSA. This displacement is in accord with the strong H-donor character of the acid. From the concentration of H-bonded acrylonitrile, the mean number of H-bonds in which each solvent molecule participates can be calculated. This number changes from ca. 0.2 in the less concentrated solution up to ca. 2.4 in the most concentrated solution. These results suggest that BSA–acrylonitrile complexes of fixed stoichiometry do not occur in the range of concentrations studied here.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 61, Issues 13–14, October 2005, Pages 2939–2945
نویسندگان
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