کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1407110 | 1501888 | 2008 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Polymorphism of l-nitroargininium bromide monohydrate
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We have found that l-nitroargininium bromide monohydrate (l-NNA·HBr·H2O) has two polymorphic (α and β) forms. Vibrational spectra of l-NNA·HBr·H2O (α and β forms) and the previously known l-NNA·HCl·H2O are reported. On the basis of vibrational spectra it is concluded that α-form l-NNA·HBr·H2O is isostructural with l-NNA·HCl·H2O, in the structure of which carboxyl groups form hydrogen bonds with chloride ions. We have determined crystal and molecular structures of β-form l-NNA·HBr·H2O. Unlike l-NNA·HCl·H2O and therefore α-form l-NNA·HBr·H2O, in the structure of β-form carboxyl group forms strong hydrogen bond with water molecule. Similarity of the structure of β-form l-NNA·HBr·H2O with the structure of anhydrous l-nitroarginine methyl ester hydrochloride is revealed, which happens because OH3 grouping serves as methyl group. IR spectra of anhydrous specimens l-NNA·HCl and l-NNA·HBr (α and β forms) are reported as well.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 875, Issues 1â3, 17 March 2008, Pages 272-281
Journal: Journal of Molecular Structure - Volume 875, Issues 1â3, 17 March 2008, Pages 272-281
نویسندگان
R.A. Apreyan, H.A. Karapetyan, A.M. Petrosyan,