کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9589481 1393806 2005 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
UV-Raman study and theoretical analogue of picolinic acid in aqueous solution
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
UV-Raman study and theoretical analogue of picolinic acid in aqueous solution
چکیده انگلیسی
High quality Raman spectrum of picolinic acid aqueous solution with ultraviolet (UV) excitation of 325 nm was obtained in this article. The state of picolinic acid in aqueous solution has been investigated over a wide range of solution pH values. The distinct changes of UV-Raman spectra accompanied with the pH variations indicate the changes of molecule structure. The calculations based on density functional theory were used to analyze the states of picolinic acid in aqueous solution. By comparing the experimental frequencies with the calculated ones, it can be concluded that when pH value varies from high to low, the picolinic acid tends to change from the anion form to the zwitterion that have the intermolecular hydrogen COOH⋯N bond.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Spectroscopy - Volume 234, Issue 1, November 2005, Pages 137-142
نویسندگان
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