Stimulated emission of ultraviolet radiation by benzoxazoles

Gruzinskii, V. V.; Danilova, V. I.; Kopylova, T. N.; Petrovich, P I; Shishkina, E Yu

doi:10.1070/qe1980v010n06abeh010255

Cited by 3 publications

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“…To confirm purity, 13 The melting point temperatures were measured from the peak melting endotherms using a Perkin-Elmer DSC 2B differential scanning calorimeter at a heating rate of 10 K/min. The melting temperatures for R-NPD and PPO were determined to be 123.4 and 73.3 °C, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…This paper presents a fuller account of our previous communication. 6 Research on the general lasing action of these phenyloxazoles (Table 1) has been reported previously [7][8][9][10][11][12][13][14][15] in qualitative surveys.…”

Section: Introductionmentioning

confidence: 99%

“…Mrs. Cristina Diaz is acknowledged for the gift of a sample of 2-phenyloxazole. We acknowledge with thanks the assistance of the staff of the magnetic resonance laboratory and Dr. R. Rosanske for recording the 13 C NMR spectra of R-NPD and PPO and his helpful comments. We thank Dr. J. R. Isasi for measuring the melting temperatures and for interesting discussions.…”

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confidence: 99%

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Spectroscopy of Amplified Spontaneous Emission Laser Spikes in Phenyloxazoles. Prototype Classes

1997

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Ultraviolet amplified spontaneous emission (ASE) laser spikes are demonstrated for the phenyloxazoles. The principal laser spikes are at 333 nm for 2-phenylbenzoxazole (PBO) and at 374 nm for 2,5-diphenyloxazole (PPO), with two laser spikes at 365 and 385 nm for 2-(1-naphthyl)-5-phenyl-1,3,4-oxadiazole (α-NPD), all in hydrocarbon solution at 298 K. The extended symmetrical molecule 1,4-bis(4-methyl-5-phenyloxazol-2-yl)benzene (DPOPOP) has a laser spike at 420 nm. The lasing action is stable with time for stirred hydrocarbon solutions deoxygenated by Ar bubbling. Gain coefficients up to 10 cm-1 have been observed in the cases cited. It is demonstrated that the phenyloxazoles can be categorized by the ASE laser spike spectroscopy observed. In the simple case, ASE spike appears at the position of the strongest fluorescence vibronic peak. Phenyloxazoles with asymmetric substitution (PPO, α-NPD) exhibit dual laser spikes, with dominance of that laser spike corresponding to a vibronic band of secondary intensity. This highly anomalous behavior is attributed to two normal mode segments of the electronic systems, with solitonic transfer of vibrational distortion between the segments driven by entropic and energetic preference. It is demonstrated that ASE laser spectroscopy offers excitation dynamics information not revealed in stationary state spectroscopy.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectroscopy of Amplified Spontaneous Emission Laser Spikes in Phenyloxazoles. Prototype Classes

1997

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“…The 2-phenyl-benzoxazole series was chosen for the following reasons: (i) Compounds of this family show excellent fluorescence properties when dissolved in organic solvents or dispersed in a matrix. They serve as near-UV dyes in many applications, such as scintillation counters, laser dyes, optical brighteners for textiles, and biological probes . (ii) The photophysical behavior, studied in solution, is well-known. ,, (iii) Curiously, to our knowledge, solid-state spectroscopic properties in the 2-phenyl-benzoxazole series have hardly been investigated yet.…”

Section: Introductionmentioning

confidence: 99%

Facile Access to Highly Fluorescent Nanofibers and Microcrystals via Reprecipitation of 2-Phenyl-benzoxazole Derivatives

Ghodbane¹,

D’Altério²,

Saffon³

et al. 2011

Langmuir

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2-Phenyl-benzoxazole and five derivatives bearing an alkyl or alkoxy substituent on the phenyl ring were used to prepare aqueous suspensions of particles via a solvent-exchange method. In these conditions, the methyl and methoxy derivatives spontaneously gave nanofibers, while the other compounds led to microcrystals. This shows that minor chemical changes are enough to direct the formation of a given type of particle. From a spectroscopic viewpoint, all compounds strongly emit blue light in the solid state, with spectra much broader than those registered in n-heptane and ethanol solutions. The photoluminescence quantum yields reached 38% and were slightly affected in aqueous suspension by the polarity of the environment. The molecular arrangement, deduced from X-ray analysis for the methyl and methoxy derivatives, was used to explain the fluorescence properties in the solid state. This work shows that 2-phenyl-benzoxazole derivatives are interesting candidates for applications as fluorescent nanomaterials, including in aqueous and biological media.

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Time dependent density functional study of the absorption spectra of 1,3-benzoxazole and three substituted benzoxazole in gas phase and liquid phase

Carrasquilla

Neira

2011

J. Phys.: Conf. Ser.

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Stimulated emission of ultraviolet radiation by benzoxazoles

Cited by 3 publications

References 0 publications

Spectroscopy of Amplified Spontaneous Emission Laser Spikes in Phenyloxazoles. Prototype Classes

Spectroscopy of Amplified Spontaneous Emission Laser Spikes in Phenyloxazoles. Prototype Classes

Facile Access to Highly Fluorescent Nanofibers and Microcrystals via Reprecipitation of 2-Phenyl-benzoxazole Derivatives

Time dependent density functional study of the absorption spectra of 1,3-benzoxazole and three substituted benzoxazole in gas phase and liquid phase

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