کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5375709 | 1504306 | 2008 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Understanding the photophysics of 4-nitro-1-hydroxy-2-naphthoic acid: A controlled excited state proton transfer
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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: Understanding the photophysics of 4-nitro-1-hydroxy-2-naphthoic acid: A controlled excited state proton transfer Understanding the photophysics of 4-nitro-1-hydroxy-2-naphthoic acid: A controlled excited state proton transfer](/preview/png/5375709.png)
چکیده انگلیسی
This paper reports on the excited state intramolecular proton transfer (ESIPT) in 4-nitro-1-hydroxy-2-naphthoic acid (NHNA) as compared to the excited state photophysics of 1-hydroxy-2-naphthoic acid (HNA). Normally, HNA does not show an ESIPT, although the other regioisomer of the molecule, (3, 2HNA), does show an ESIPT. The calculated excited state double-well potential, charge density, bond length and dipole moment evince that, in contrast to the parent compound HNA, NHNA is conducive to ESIPT. Emission bands were attributed to the neutral form (410Â nm), the intermolecular proton transfer form (490Â nm) and the intramolecular proton transfer (zwitterionic) form (560Â nm). NHNA showed phosphorescence arising from the open conformer, whereas HNA showed no phosphorescence. Intramolecular hydrogen bonding in NHNA seems to hinder the formation of the open conformer in polar solvent. A complete picture of the photophysical processes in NHNA after photoexcitation was obtained from the time-resolved emission along with kinetic analysis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 352, Issues 1â3, 3 September 2008, Pages 175-184
Journal: Chemical Physics - Volume 352, Issues 1â3, 3 September 2008, Pages 175-184
نویسندگان
D. Sahoo, T. Adhikary, P. Chowdhury, S.C. Roy, S. Chakravorti,