The excitation wavelength dependent fluorescence of porphyrins

Spectroscopic studies of meso-tetraphenylporphyrin and other similar derivatives have revealed a dual fluorescence emission process in which the second emission process is proposed to arise following hydrogen atom tunnelling in the excited-state. Spectroscopic studies of meso-tetraphenylporphyrin an...

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Bibliographic Details
Published in:Chemical physics letters Vol. 454; no. 4; pp. 223 - 228
Main Authors: Uttamlal, Mahesh, Sheila Holmes-Smith, A.
Format: Journal Article
Language:English
Published: Elsevier B.V 20-03-2008
Online Access:Get full text
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Summary:Spectroscopic studies of meso-tetraphenylporphyrin and other similar derivatives have revealed a dual fluorescence emission process in which the second emission process is proposed to arise following hydrogen atom tunnelling in the excited-state. Spectroscopic studies of meso-tetraphenylporphyrin and other meso-substituted porphyrin derivatives have revealed a dual fluorescence emission process. The first emission is the usual 1(π←π ∗) transition. The second alternative emission process is proposed to arise following tautomerism of the inner macrocyclic hydrogen atoms via an atom tunnelling process. This process occurs when exciting at virtually all wavelengths in the Q band region but, is at its most intense when exciting at the Q x (0,0) band and is not observed when exciting at the Soret band maximum, i.e., the emission spectrum of TPP is dependent on the excitation wavelength.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2008.02.012