Ultrafast back electron transfer processes in the photoexcited methylviologen-iodide charge transfer complexes

Ultrafast back electron transfer processes in the photoexcited methylviologen-iodide charge... The ultrafast back electron transfer in the excited charge transfer complexes of the methylviologen with iodide ions has been investigated using femtosecond transient absorption spectroscopy. Methylviologen and iodide form two types of charge transfer complexes each characterized by a charge transfer band in the same spectral region. At low I- concentrations mainly a 1:1 complex MV2+(I-) is present while at high I- concentrations both 1:1 and 1:2 complexes MV2+(I-)2 can be observed. Ultrashort laser pulses at 400 nm are used to excite both complexes in their charge transfer band. The observed transient absorption can be represented by a biexponential function with 1 ps and 20 ps time constants and attributed to the decay of the MV+./I. and MV+./I2 .- radical pair respectively. The excitation of the 1:1 complex leads to the formation of the MV+./I. radical pair while the excitation of the 1:2 complex leads to the formation of the MV+./I. and MV+./I2 .- radical pairs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Ultrafast back electron transfer processes in the photoexcited methylviologen-iodide charge transfer complexes

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Publisher
Springer Journals
Copyright
Copyright © 2001 by VSP 2001
Subject
Chemistry; Inorganic Chemistry; Physical Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/15685670152622077
Publisher site
See Article on Publisher Site

Abstract

The ultrafast back electron transfer in the excited charge transfer complexes of the methylviologen with iodide ions has been investigated using femtosecond transient absorption spectroscopy. Methylviologen and iodide form two types of charge transfer complexes each characterized by a charge transfer band in the same spectral region. At low I- concentrations mainly a 1:1 complex MV2+(I-) is present while at high I- concentrations both 1:1 and 1:2 complexes MV2+(I-)2 can be observed. Ultrashort laser pulses at 400 nm are used to excite both complexes in their charge transfer band. The observed transient absorption can be represented by a biexponential function with 1 ps and 20 ps time constants and attributed to the decay of the MV+./I. and MV+./I2 .- radical pair respectively. The excitation of the 1:1 complex leads to the formation of the MV+./I. radical pair while the excitation of the 1:2 complex leads to the formation of the MV+./I. and MV+./I2 .- radical pairs.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Oct 7, 2004

References

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