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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Published in: | Chemical physics letters Vol. 454; no. 4; pp. 223 - 228 |
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Main Authors: | , |
Format: | Journal Article |
Language: | English |
Published: |
Elsevier B.V
20-03-2008
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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. |
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ISSN: | 0009-2614 1873-4448 |
DOI: | 10.1016/j.cplett.2008.02.012 |