کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9575299 | 1504345 | 2005 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Theoretical and spectroscopic studies of pyridyl substituted bis-coumarins and their new neodymium (III) complexes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Theoretical and spectroscopic studies of pyridyl substituted bis-coumarins and their new neodymium (III) complexes Theoretical and spectroscopic studies of pyridyl substituted bis-coumarins and their new neodymium (III) complexes](/preview/png/9575299.png)
چکیده انگلیسی
Ab initio, DFT and spectroscopic studies of 3,3â²-(o-pyridinomethylene)di-[4-hydroxycoumarin], 3,3â²-(m-pyridinomethylene)di-[4-hydroxycoumarin] and 3,3â²-(p-pyridinomethylene)di-[4-hydroxycoumarin] were performed. The molecular and electronic structures of the compounds were investigated using accurate HF and B3LYP/6-31G(d) calculations. Molecular quantities as vertical ionization potential, electron affinity, electronegativity, hardness and electrophilicity indices of the neutral species were calculated and discussed. Molecular electrostatic potential was considered as an additional molecular characteristic for predicting the most probable sites for electrophilic attack. The molecular structure and quantities of the dianionic species, which are active in solution, were calculated and discussed. The theoretical results suggested that both carbonyl and both hydroxyl oxygen atoms are preferred binding sites for electrophilic attack, in particular for a metal coordination. Further, the coordination abilities of the compounds were studied in complexation reactions with Nd(III). Complexes of Nd(III) with o-, m- and p-3,3â²-(pyridinomethylene)di-[4-hydroxycoumarin] were synthesized and characterized by different physicochemical methods: elemental analysis, IR, 1H NMR spectroscopies and mass spectral data. The experimental data confirmed the theoretical predictions that the ligands in Nd(III) complexes are tetradentate and bound the metal ion through both carbonyl and both deprotonated hydroxyl oxygen atoms.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 314, Issues 1â3, 18 July 2005, Pages 73-84
Journal: Chemical Physics - Volume 314, Issues 1â3, 18 July 2005, Pages 73-84
نویسندگان
Irena Kostova, Natasha Trendafilova, Tzvetan Mihaylov,