Phosphorescence of matrix-isolated naphthalene and phenanthrene

“…Matrix gases commonly employed include nitrogen, argon, and xenon, all of which can readily be purged of luminescent contaminants. While MI has been widely employed in absorption spectrometry, particularly in the infrared (33,34), few reports of MI fluorescence or phosphorescence spectra have appeared (35)(36)(37)(38). While the potential advantages of MI fluorometry as an analytical technique were discussed as early as 1969 (39), no analytical applications of MI luminescence techniques have yet appeared.…”

mentioning

confidence: 99%

Low-temperature fluorescence spectrometric determination of polycyclic aromatic hydrocarbons by matrix isolation

Stroupe¹,

Tokousbalides²,

Dickinson³

et al. 1977

Anal. Chem.

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The performance of quantitative low-temperature fluorometry by the technique of matrix Isolation Is reported. Matrix-isolated samples of polycyclic aromatic hydrocarbons (PAH) are prepared by mixing the PAH vapors effusing from a Knudsen cell with a large excess of nitrogen gas; the gaseous mixture Is then deposited onto an optical window at ~15 K. Detection limits for PAH in nitrogen matrices are on the order of 11 g. Quantitative working curves for PAH are linear over five decades or more in concentration. Linear working curves can readily be obtained for Individual PAH In mixtures of Isomeric compounds. The use of matrix-isolation fluorometry for identification and quantitation of PAH in complex samples derived from coal liquids Is demonstrated.

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“…Shpol'skii Effect. A very straightforward approach that has been widely used for polycyclic aromatic hydrocarbons (PAH) employs the fact that at temperatures below 80 K, many PAH compounds exhibit very narrowband (quasi-line) emission spectra (Shpol'skii effect) (29) when dissolved in n-alkane solvents or codeposited on a cold window with an inert gas such as argon (matrix isolation) (30,31). The spacings of the sharp vibronic lines of the emission spectra are well correlated with vibrational frequencies of the ground state as measured by infrared and Raman spectroscopy.…”

Section: Comparison With Other Multicomponent Systemsmentioning

confidence: 99%