Single-photon ionization of pyrene and anthracene giving trapped electrons in alkali-metal cation-exchanged zeolites X and Y: a direct time-resolved diffuse reflectance study

Time-resolved diffuse reflectance spectroscopy is used to investigate the photolysis of anthracene- or pyrene-impregnated alkali-metal-cation-exchanged zeolite X and Y with a nitrogen laser (337 nm). The studies suggest that anthracene or pyrene molecules are distributed in at least two different si...

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Bibliographic Details
Published in:Journal of physical chemistry (1952) 1991, Vol.95 (2), p.506-509
Main Authors: Iu, Kai Kong, Thomas, J. K
Format: Article
Language:English
Subjects:
400201 - Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ANTHRACENE
AROMATICS
CHEMICAL REACTIONS
Chemistry
CONDENSED AROMATICS
DATA
DECOMPOSITION
Exact sciences and technology
EXPERIMENTAL DATA
General and physical chemistry
HYDROCARBONS
INFORMATION
INORGANIC ION EXCHANGERS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
ION EXCHANGE MATERIALS
IONIZATION
LASERS
MATERIALS
MEASURING METHODS
MINERALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOIONIZATION
PHOTOLYSIS
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
PYRENE
Solvated and trapped electrons
SPECTROSCOPY
SURFACE PROPERTIES
ZEOLITES
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Summary:Time-resolved diffuse reflectance spectroscopy is used to investigate the photolysis of anthracene- or pyrene-impregnated alkali-metal-cation-exchanged zeolite X and Y with a nitrogen laser (337 nm). The studies suggest that anthracene or pyrene molecules are distributed in at least two different sites (active and nonactive) in the zeolite X and Y. Excitation of anthracene or pyrene adsorbed in nonactive sites produces singlet excited states of anthracene or pyrene, which can either be photoionized by absorbing a second photon or decay to the triplet excited states through intersystem crossing; however, anthracene or pyrene adsorbed in active sites is photoionized through a single-photon process. The products of the photoionization are cation radicals of arene and trapped electrons (e.g., Na{sub 4}{sup 3+} for NaY). The broad absorption band for the trapped electron is around 550 nm for both NaX and NaY; around 620 nm for both LiX and LiY and around 710 nm for KX.
ISSN:0022-3654
1541-5740
DOI:10.1021/j100155a002