1972
DOI: 10.1021/ja00762a036
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Fluorescence of aromatic benzoxazole derivatives

Abstract: ketone in CC1«), and that they have been able to obtain a good fit for the observed variation by means of their calculations. We are grateful to Dr. Kaptein for providing us with a copy of his thesis, which represents a magnificent body of work.(25) Note Added in Proof. Fischer and Lehnig141* have determined the esr parameters of CI2CH• as g = 2.00829 ± 0.00010 and A = 16.79 ± 0.05 G. See H. Fischer and M. Lehnig, Phys. Chem., 75, 3410 1971); this paper reports the work cited in our ref 14a.search, The Univer… Show more

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Cited by 127 publications
(72 citation statements)
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“…It is noted that the excitation spectrum showed a correspondence between the blue emission and the long wavelength absorption. The shorter wavelength emission was observed in 3, and its fluorescence quantum yield was evaluated to be very small (Φ= 0.002 in methanol) [20], which is in sharp contrast to almost unity of 2-(4-aminophenyl)benzoxazole. The small fluorescence quantum yield of 3 is ascribed to the fluorine atoms substituted at the ortho-positions of 2-phenyl group [16].…”
mentioning
confidence: 83%
“…It is noted that the excitation spectrum showed a correspondence between the blue emission and the long wavelength absorption. The shorter wavelength emission was observed in 3, and its fluorescence quantum yield was evaluated to be very small (Φ= 0.002 in methanol) [20], which is in sharp contrast to almost unity of 2-(4-aminophenyl)benzoxazole. The small fluorescence quantum yield of 3 is ascribed to the fluorine atoms substituted at the ortho-positions of 2-phenyl group [16].…”
mentioning
confidence: 83%
“…The chemical shifts are given in δ/ppm downfield from tetramethylsilane as an internal standard for 1 H nmr spectra and downfield from trifluoroacetic acid as an external standard for 19 F nmr spectra, respectively; J values are given in Hz. The fluorescence quantum yields were estimated relatively, on the basis of Φ f = 0.78 for 2-phenylbenzoxazole in cyclohexane [10].…”
Section: Methodsmentioning
confidence: 99%
“…We had already established that benzimidazolium groups as auxofluors on a fluorene gave a bright fluor, but with too short an emission wavelength [8]. It has long been known that benzoxazoles as auxofluors on oligophenylenes or fluorenes give fluors that are photostable, bright and fast (τ f = 1-2 nsec), albeit of far too short emission wavelength [9], so it seemed reasonable to prepare oligofurans terminated with benzoxazoles for this work. The placement of the strongly electron-attracting benzoxazol-2-yl group on the 2-and 5-positions of electron-releasing oligofurans was expected to give reasonably stable compounds.…”
Section: J Heterocyclic Chem 39 981(2002)mentioning
confidence: 99%