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Photochemical and photophysical properties of ion-pair charge transfer complexes for all-optical information processing

Paper ID Volume ID Publish Year Pages File Format Full-Text
31355 44747 2007 17 PDF Available
Title
Photochemical and photophysical properties of ion-pair charge transfer complexes for all-optical information processing
Abstract

The photochemical and photophysical properties of ion-pair charge transfer (IPCT) complexes comprising of 4,4′-bipyridinium and various counter ions have been reviewed. Quantum chemical and thermodynamic properties of IPCT complexes are summarized. IPCT complexes of 4,4′-bipyridinium with tetraphenylborate derivatives showed specific absorption and fluorescence properties. The photoinduced electron transfer from a counter anion to 4,4′-bipyridinium cation occurred within less than 100 fs upon excitation of IPCT complexes. The back electron transfer was controlled by changing counter anions and/or microenvironments. The transient absorption spectroscopy showed the ultrafast back electron transfer between 4,4′-bipyridinium and iodide in less than 2 ps. The absorption spectra of reduced 4,4′-bipyridinium derivatives were controlled over a broad range covering from visible to optical telecommunication wavelength. This phenomenon was applied to all-optical light modulation based on the guided wave mode devices composed of a photoresponsive polymer layer and a low-refractive-index polymer layer.

Keywords
Ion-pair charge transfer (IPCT) complex; 4,4’-bipyridinium derivatives; Photoinduced electrochromism; Counter anion effect; Transient absorption spectroscopy; Photoresponsive polymer; All-optical light modulation; Guided wave mode device
First Page Preview
Photochemical and photophysical properties of ion-pair charge transfer complexes for all-optical information processing
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology C: Photochemistry Reviews - Volume 8, Issue 4, December 2007, Pages 174–190
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering