کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5395422 | 1392238 | 2011 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
DFT/TD-DFT investigation of optical absorption spectra, electron affinities, and ionization potentials of mono-nitrated benzanthrones
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Density functional theory (DFT) method B3LYP with basis sets 6-311+G(d,p), 6-31G(d) and 6-311G(d,p) have been used to compute molecular structures, UV-vis absorption spectra, electron affinities (EAs), and ionization potentials (IPs) of benzanthrone and 1-, 2-, 3-, 9-, 10-, and 11-nitrobenzanthrones. With the use of the time-dependent TD-B3LYP/6-311G(d,p) approach, the UV/vis absorption spectral bands, vertical excitation energies and oscillator strengths was studied. The calculated vertical excitation energies lie within <0.15Â eV of the observed values. In comparison to benzanthrone, calculated absorption spectra of nitrated nitrobenzanthrones show red-shifting to >383Â nm, which is correlated to their relative reactivity. Detailed clarification of the singlet-singlet excited states (and energies) are made. The calculated electron affinities are â¼0.5Â eV greater than in benzanthrone (BA); being in the order 3-NBAÂ >Â 10-NBAÂ >Â 1-NBAÂ >Â 2-NBAÂ >Â 9-NBAÂ >Â 11-NBAÂ >Â BA. Similarly, ionization potentials follow a very close order in nitro-BAs. The calculated EAs and IPs implicate both reductive and oxidative pathways on transformation to mutagenic metabolites. The implications of the results are discussed in the context of their differential mutagenic potencies.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational and Theoretical Chemistry - Volume 963, Issue 1, January 2011, Pages 40-50
Journal: Computational and Theoretical Chemistry - Volume 963, Issue 1, January 2011, Pages 40-50
نویسندگان
Kefa K. Onchoke,