کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1406208 | 1501842 | 2010 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The specificity of the [NHN]+ hydrogen bonds in protonated naphthalene proton sponges
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A short review of data related to the structure and infra-red and 1H NMR spectra of protonated naphthalene proton sponges (DMAN-s) is presented. Protonated DMAN-s are characterized by a very low frequency of ν(NHN)+ stretching vibrations, ca. 500 cm−1, with an unusual 1H/2H isotope effect opposite to that commonly observed, reaching values above 2. The 2,7 derivatives showing the buttressing effect are analyzed. The shortest bridge was found for the 2,7-di-Si(CH3)3 derivative, which is close to the shortest bridge in protonated 1,6-diazabicyclo[4.4.4]tetradecane, for which a single minimum potential for proton motion was reported. However, in protonated DAMN-s a double minimum with a very low barrier (LBHB) is always present.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 972, Issues 1–3, 19 May 2010, Pages 59–63
Journal: Journal of Molecular Structure - Volume 972, Issues 1–3, 19 May 2010, Pages 59–63
نویسندگان
L. Sobczyk,