Quasi-line absorption and phosphorescence spectra of 5,6-benzoquinoline and quinoline in n-paraffins at 77� K

Mamedov, Kh. I.; Laipanov, R. Z.

doi:10.1007/bf00604685

Cited by 1 publication

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“…In particular, acid-base equilibria and electric dipole moments in a singlet excited state, have been determined [1]. Spectral properties of BQ were also investigated in several reports [2][3][4]. BQ can be efficiently quenched by heavy metal ions, which may enhance the intersystem crossing process (triplet state population) [5,6].…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Phosphorescence of 5,6-Benzoquinoline

Chavez¹,

Ceresa²,

Kitchner³

et al. 2023

Methods Appl. Fluoresc.

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Phosphorescence emission of 5,6-Benzoquinoline embedded in poly (vinyl alcohol) film has been studied at room temperature. A strong green long-lived emission was observed in films doped with 5,6-Benzoquinoline while illuminated on a UV plate. A broad phosphorescence emission spectrum is centered at about 500 nm. The phosphorescence excitation spectrum follows the absorption spectrum of 5,6-Benzoquinoline, except for a long-wavelength part, which is well beyond the absorption band. This long-wavelength part of the absorption spectrum is responsible for the forbidden S0 – T1 transition. The excitation at 430 nm resulted in the long-lived emission with a spectrum similar to the phosphorescence spectrum obtained with UV excitation within the absorption of 5,6-Benzoquinoline. The phosphorescence anisotropy obtained with a direct S0 – T1 excitation is positive, while the UV excitation is negative. In contrast to fluorescence, the phosphorescence intensity strongly depends on temperature. Phosphorescence lifetimes with UV and long-wavelength excitation are similar, with a mean value of about 0.5 s.

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Section: Introductionmentioning

confidence: 99%