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Multiphoton processes in photoreactions of indocyanine green in ethanol

Paper ID Volume ID Publish Year Pages File Format Full-Text
26654 43969 2013 7 PDF Available
Title
Multiphoton processes in photoreactions of indocyanine green in ethanol
Abstract

In cyanine dye, new photoreaction paths involving multiphoton processes were uncovered by ultrafast transient absorption spectroscopy. In contrast to the conventional reaction path that proceeded through one-photon resonance to the S1 state by near-infrared light irradiation, the new reaction paths were found to proceed through near-infrared multiphoton excitation to higher excited states and the optical order of the electronic excitation was dependent on the type of photoproduct: a four-photon process for cis isomers and three for photodegradation. Leuco forms with saturated hydrocarbon chain seem to be formed by photodegradation. The ultraviolet pump fluence dependence of the cis isomer production was consistent with the near-infrared pump fluence dependence. Changing the near-infrared pump fluence controlled the number ratio of cis isomers to degraded molecules.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Ultrafast transient absorption spectroscopy. ► Photoisomerization of ICG molecule was completed within 2 ns. ► New photoisomerization path involving near-infrared four-photon process. ► New reaction path to leuco-forms involving near-infrared three-photon process. ► Control of the number ratio of cis-isomers to leuco-forms by changing pump fluence.

Keywords
Multiphoton process; Indocyanine green; Trans-to-cis photoisomerization; Leuco-form; Reaction control; Ultrafast transient absorption spectroscopy
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 252, 15 January 2013, Pages 152–158
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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Any Questions? feel free to contact us