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Unusual conformational effects in proton transfer kinetics of an excited photochromic Schiff base

Paper ID Volume ID Publish Year Pages File Format Full-Text
28618 44082 2006 8 PDF Available
Title
Unusual conformational effects in proton transfer kinetics of an excited photochromic Schiff base
Abstract

The compound 4-methoxy-2,5-bis(phenyliminomethyl)-phenol representing a group of recently synthesized new photochromic Schiff bases, has been studied by transient absorption and time-resolved fluorescence measurements in femto- and picosecond time domains. Two different conformers of the keto tautomer, decaying with the time constants 480 and 110 ps, have been detected. The first one is created within 50 fs, and the second one – exceptionally slowly – with the time constant of about 10 ps. The fast route occurs in the planar system, and the slow one involves the rotation around the CC bond between the central phenyl ring and the phenylimino group, leading to the metastable photochromic form. For the first keto conformer the evidence of fast vibrational relaxation taking place on the time scale of several hundreds of femtoseconds is observed.

Keywords
Excited state intramolecular proton transfer; Photochromism; Schiff bases; Ultrafast laser spectroscopy
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Unusual conformational effects in proton transfer kinetics of an excited photochromic Schiff base
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 180, Issues 1–2, 15 May 2006, Pages 101–108
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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