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Excited-state absorption investigation of a cationic porphyrin derivative

Paper ID Volume ID Publish Year Pages File Format Full-Text
26898 43986 2010 6 PDF Available
Title
Excited-state absorption investigation of a cationic porphyrin derivative
Abstract

This work presents a complete investigation on the excited-state absorption of a new porphyrin derivative, the free-base 5,10,15,20-tetrakis (1,3-dimethylimidazolium-2-yl) porphyrin tetraiodide (H2-TDMImP), for which the excited singlet and triplet transient absorption spectra were obtained. In order to accomplish this task, we employed the laser flash photolysis (LFP) technique in association with the white-light continuum (WLC) Z-scan measurements. The transient singlet absorption spectrum shows a reverse saturable absorption around the Q-band region (500–650 nm) and a small saturable absorption around 650 nm. From LFP experiments we verified that this porphyrin presents a biexponential decay profile, with a low quantum yield for triplet state formation. Besides, we observed that the reverse saturable absorption also takes place in triplet state.

Keywords
Porphyrin; White-light Z-scan; Laser flash photolysis; Excited-state absorption
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 214, Issues 2–3, 15 August 2010, Pages 115–120
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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