کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5375438 1504294 2009 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of strong inter-hydrogen bond dynamical couplings in the polarized IR spectra of adipic acid crystals
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Effects of strong inter-hydrogen bond dynamical couplings in the polarized IR spectra of adipic acid crystals
چکیده انگلیسی
This paper presents the results of the re-investigation of polarized IR spectra of adipic acid and of its d2, d8 and d10 deuterium derivative crystals. The spectra were measured at 77 K by a transmission method using polarized light for two different crystalline faces. Theoretical analysis concerned linear dichroic effects and H/D isotopic effects observed in the spectra of the hydrogen and deuterium bonds in adipic acid crystals at the frequency ranges of the νO-H and the νO-D bands. The two-branch fine structure pattern of the νO-H and νO-D bands and the basic linear dichroic effects characterizing them were ascribed to the vibronic mechanism of vibrational dipole selection rule breaking for IR transitions in centrosymmetric hydrogen bond dimers. It was proved that for isotopically diluted crystalline samples of adipic acid, a non-random distribution of protons and deuterons occurs in the dimers (H/D isotopic “self-organization” effect). This effect results from the dynamical co-operative interactions involving the dimeric hydrogen bonds.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 364, Issues 1–3, 16 October 2009, Pages 76-89
نویسندگان
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