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Temperature dependence of ultrafast photoinduced ring-opening and -closure reactions of spironaphthooxazine in crystalline phase

Paper ID Volume ID Publish Year Pages File Format Full-Text
29347 44158 2006 7 PDF Available
Title
Temperature dependence of ultrafast photoinduced ring-opening and -closure reactions of spironaphthooxazine in crystalline phase
Abstract

To investigate the dynamics of photoinduced ring-opening and -closure reactions in crystalline phase, we measured transient absorption spectra of spironaphthooxazine microcrystalline powder by femtosecond diffuse reflectance spectroscopy and examined their temperature dependence. The lifetimes of the excited state of the spiro form and the subsequent non-planar open form were about 3 ps and 3 ns at room temperature, respectively. The temperature dependence of their decay constant showed the Arrhenius type behavior and the activation energy of the ring-opening and -closure reactions are estimated to 7 and 12 kJ mol−1, respectively. The yield of the non-planar open form became smaller at lower temperature, and it was zero below about 140 K. The experimental results and kinetic analysis indicate that a short-lived species having a molecular conformation different from the non-planar form should be considered as an intermediate in the ring-opening reaction.

Keywords
Phtochromism; Spyrooxazine; Solid state reaction; Reaction dynamics; Transient absoroption spectroscopy; Temperature dependence
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Temperature dependence of ultrafast photoinduced ring-opening and -closure reactions of spironaphthooxazine in crystalline phase
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 178, Issues 2–3, 20 March 2006, Pages 170–176
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us