NDLI: Fluorescent Coumarin Derivatives with Viscosity Sensitive Emission - Synthesis, Photophysical Properties and Computational Studies

Content Provider	Springer Nature Link
Author	Phatangare, Kiran R. Lanke, Sandip K. Sekar, Nagaiyan
Copyright Year	2014
Abstract	New derivatives of (benzo[d]azolyl)-benzo[f]chromenone were synthesized from the intermediate 3-(1,3-benzazol-2-yl)naphthalen-2-ol, obtained from 3-hydroxynaphthalene-2-carboxylic acid and 2-amino phenol in the presence of PCl$_{3}$ in chlorobenzene at 130–135 °C. The compounds were characterized by FT-IR, $^{1}$ H NMR, mass spectroscopy and elemental analysis. The synthesized compounds are fluorescent which absorb in the range of 296 to 332 nm while emit in the range of 368 to 404 nm. The experimental absorption and emission wavelengths for the compounds 5 and 6 are in good agreement with those predicted using the Time-Dependent Density Functional Theory (TD-DFT) [B3LYP/6-31G(d)]. The largest wavelength difference between the experimental and computed absorption maxima was 29 nm (tetrahedrofuran) for compound 5 while for emission it was 61 nm (dichloromethane) for compound 7. The emission intensities of all the compounds decrease continuously as the viscosity of the microenvironment increases. The compounds are thermally stable up to a temperature range of 300 to 350 °C.
Starting Page	1263
Ending Page	1274
Page Count	12
File Format	PDF
ISSN	10530509
Journal	Journal of Fluorescence
Volume Number	24
Issue Number	4
e-ISSN	15734994
Language	English
Publisher	Springer US
Publisher Date	2014-06-03
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Benzoxazolylnaphthalenol DFT 3H-benzo[f]chromen-3-one Fluorescence Heterocyclic synthesis Photophysical properties Viscosity Biomedicine general Biophysics and Biological Physics Biotechnology Biochemistry Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Sociology and Political Science Spectroscopy Law Biochemistry Clinical Biochemistry Clinical Psychology

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