کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1247099 | 969798 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Resolution of carboxylate protonation microequilibria of NTA, EDTA and related complexones
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Potentiometric and NMR–pH titrations were carried out on four classical complexones to elucidate their overall and site-specific basicities. NMR–pH profiles and Bjerrum's functions were adjusted to compound-specific symmetries and appropriate evaluation methods were developed. Symmetry-modulated relationships between the macro- and microconstants were deduced and self-consistent sets of microconstants were determined. The inherent basicity of carboxylates surrounded by adjacent, intramolecular ammonium and carboxylate sites have been found to be in the range of 1.83–2.02 log k units, which are reduced by 0.05–0.12 log k units upon a nearby carboxylate protonation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Talanta - Volume 74, Issue 4, 15 January 2008, Pages 666–674
Journal: Talanta - Volume 74, Issue 4, 15 January 2008, Pages 666–674
نویسندگان
Zoltán Szakács, Szabolcs Béni, Béla Noszál,