Photochemical properties of Ag ion clusters included within ZSM-5 zeolites prepared by an ion-exchange method

Photochemical properties of Ag ion clusters included within ZSM-5 zeolites prepared by an... Photoluminescence investigations of the Ag ion-exchanged ZSM-5 (Ag+ /ZSM-5) zeolite revealed that a Ag ion cluster (Agn m +) exists in the pore structure of ZSM-5 exhibiting photoluminesm cence at 380 nm upon excitation at 332 nm. UV irradiation (λ = 285 nm) of Ag+ /ZSM-5 at 77 K leads to the transformation of Agn m + into a different Ag ion cluster (Agm (n-1)+) which exhibits photoluminescence at 465 nm upon excitation at 315 nm. This photo-transformation of the Ag ion clusters was found to be thermally reversible under vacuum. It was demonstrated that an electron transfer from the photo-excited Al3+ -O2- to Agn m + plays a significant role in this process. In the presence of oxygen, UV irradiation of Ag+ /ZSM-5 leads to the formation of O2- instead of an Ag ion cluster (Agm (n-1)+), suggesting that oxygen acts as an efficient electron scavenger, which interferes with the electron capture of Agn m + under UV irradiation at 285 nm. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Photochemical properties of Ag ion clusters included within ZSM-5 zeolites prepared by an ion-exchange method

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Publisher
Brill Academic Publishers
Copyright
Copyright © 2003 by VSP 2003
Subject
Chemistry; Inorganic Chemistry; Physical Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856703322149017
Publisher site
See Article on Publisher Site

Abstract

Photoluminescence investigations of the Ag ion-exchanged ZSM-5 (Ag+ /ZSM-5) zeolite revealed that a Ag ion cluster (Agn m +) exists in the pore structure of ZSM-5 exhibiting photoluminesm cence at 380 nm upon excitation at 332 nm. UV irradiation (λ = 285 nm) of Ag+ /ZSM-5 at 77 K leads to the transformation of Agn m + into a different Ag ion cluster (Agm (n-1)+) which exhibits photoluminescence at 465 nm upon excitation at 315 nm. This photo-transformation of the Ag ion clusters was found to be thermally reversible under vacuum. It was demonstrated that an electron transfer from the photo-excited Al3+ -O2- to Agn m + plays a significant role in this process. In the presence of oxygen, UV irradiation of Ag+ /ZSM-5 leads to the formation of O2- instead of an Ag ion cluster (Agm (n-1)+), suggesting that oxygen acts as an efficient electron scavenger, which interferes with the electron capture of Agn m + under UV irradiation at 285 nm.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Oct 17, 2004

References

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