کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10578442 | 979713 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sucrose bis(1,10-phenanthroline) cobalt(III). Comparison of semi-empirical and ab initio geometrical optimizations
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی معدنی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The title compound (sucrose Co(phen)2) is a dication with the Î-configuration at Co(III) and ligation through O-2(g) and OH-1(f). Earlier geometrical optimization with semi-empirical PM3(tm) parameters had fitted most of the structural evidence from absorption, CD and NMR spectroscopy, although the site of deprotonation was predicted to be OH-1(f) rather than OH-2(g) as shown by NMR spectroscopy. Both HF and DFT treatments have now been used and they correctly predict deprotonation of OH-2(g), in agreement with experimental data. The earlier PM3(tm) optimization indicated extensive bowing of both phenanthrolines due to steric repulsions, but the ab initio treatments indicate limited bowing which fits the NMR chemical shifts of the phenanthroline hydrogens.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polyhedron - Volume 24, Issue 9, 28 June 2005, Pages 1002-1006
Journal: Polyhedron - Volume 24, Issue 9, 28 June 2005, Pages 1002-1006
نویسندگان
Jose Parada, Carmen Ibarra, Nicholas D. Gillitt, Clifford A. Bunton,