Phosphorescence properties of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine and benzo[f]quinoline in glucose glasses via temperature variation and spectral characterization

Journal Article · Thu May 15 04:00:00 EDT 1997 · Analytical Chemistry (Washington)

DOI:https://doi.org/10.1021/ac961160p· OSTI ID:505192

Wang, J; Hurtubise, R J ^[1]

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1. Univ. of Wyoming, Laramie, WY (United States)

Phosphorescence intensities and lifetimes of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) and benzo[f]quinoline (B[f]Q) in glucose glasses were measured over a wide range of temperatures. As the temperature decreased, both the phosphorescence lifetimes and the phosphorescence intensities for PhIP and B[f]Q in glucose glasses increased. However, the phosphorescence intensity-to-lifetime ratio was not constant at different temperatures, which indicated that the triplet state formation efficiency was a function of temperature. Also, the In (1/{tau}{sub p} - 1{tau}{sub p0}) vs 1/T plots for both PhIP and B[f]Q in glucose glasses with and without a heavy-atom salt gave nonlinear plots. From the plots for the samples with and without a heavy-atom salt, activation energies were obtained. The activation energies were related to low-frequency vibrational modes in the solid matrix, rotational relaxation of functional groups, and diffusion of water in the solid matrix. Infrared spectrometry revealed water in the glasses, and phosphorescence decay curves and confocal laser scanning microscopy showed the heterogeneity of the distribution of NaI in the glucose glasses. 34 refs., 4 figs., 3 tabs.

• DOE Contract Number: FG02-86ER13547
• OSTI ID: 505192
• Journal Information: Analytical Chemistry (Washington), Journal Name: Analytical Chemistry (Washington) Journal Issue: 10 Vol. 69; ISSN ANCHAM; ISSN 0003-2700
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ACTIVATION ENERGY
GLASS
GLUCOSE
INFRARED SPECTRA
ORGANIC COMPOUNDS
PHOSPHORESCENCE
PYRIDINES
QUINOLINES
TEMPERATURE DEPENDENCE