کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1410893 | 1501838 | 2010 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structure and vibrational spectra of squaric acid complexes with 4,4â²- and 5,5â²-dimethyl-2,2â²-bipyridine
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Structure and vibrational spectra of squaric acid complexes with 4,4â²- and 5,5â²-dimethyl-2,2â²-bipyridine Structure and vibrational spectra of squaric acid complexes with 4,4â²- and 5,5â²-dimethyl-2,2â²-bipyridine](/preview/png/1410893.png)
چکیده انگلیسی
The complexes formed by squaric acid with 4,4â²- and 5,5â²-dimethyl-2,2â²-bipyridine were prepared (abbreviation 4-DMBPH+·HSQâ and 5-DMBPH+·HSQâ·H2O, respectively). Their crystal structure shows that ionization of squaric acid leads to formation of dimeric double ionized (HSQ)2â2 units and monoprotonated bipyridines. The N+H groups form bifurcated hydrogen bonds with the CO group of squarate anion and with the second non-protonated nitrogen atom. In the case of 5,5â²-DMBP the complex crystallizes with one water molecule attached to the charged N+H group, with OH groups forming hydrogen bonds to carbonyl groups of squaric acid. Infrared and Raman spectra reflect sufficiently well the packing. Most spectacular is the continuous absorption ascribed to the (HSQ)2â2 units with two very short OHâ¯O hydrogen bonds. The analysis has been performed for the 4-DMBPH+·HSQâ complex by comparison of the experimental infrared spectra with the calculated ones for separated ions and the crystalline state.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 976, Issues 1â3, 15 July 2010, Pages 30-35
Journal: Journal of Molecular Structure - Volume 976, Issues 1â3, 15 July 2010, Pages 30-35
نویسندگان
J. Nowicka-Scheibe, E. Grech, W. Sawka-Dobrowolska, G. Bator, A. PawlukojÄ, L. Sobczyk,