The lowest excited states of copper porphyrins

Article abstract of DOI:10.1063/1.455379

Relaxation processes of excited copper porphyrins were studied with relevance to the structure of the substates of the lowest excited states.Lifetimes of luminescence at room temperature were determined as 17, 29, 69, and 105 ns for T(EtO)PPCu , TPPCu(TPP: 5,10,15,20-tetraphenylporphin), TFPPCu, and OEPCu(OEP: 2, 3, 7, 8,12,13,17,18 octaethylporphin ) in toluene, respectively.Emission intensities and lifetimes of OEPCu and TFPPCu measured as a function of temperature show a variation ascribed to a Boltzmann distribution between the lowest trip-doublet and -quartet with an energy gap of 300-00 cm -1 The anomalous temperature dependence for TPPCu and T( EtO) PPCu is explained by a larger energy gap and larger vibronic distortions in the excited state.The difference in behavior is attributed to the orbital nature of the triplet: < 2,4 a 1 e)>> for OEPCu and TFPPCu but < 2,4 a 2 e)>> for TPPCu and T(EtO)PPCu.The assumption of a low energy charge tl'ansfer state is not necessary for our analysis.

Full text of DOI:10.1063/1.455379

The lowest excited states of copper porphyrins
Motoko Asano, Youkoh Kaizu, and Hiroshi Kobayashi
Citation: The Journal of Chemical Physics 89, 6567 (1988); doi: 10.1063/1.455379
View online: http://dx.doi.org/10.1063/1.455379
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/89/11?ver=pdfcov
Published by the AIP Publishing
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This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
155.33.16.124 On: Sat, 29 Nov 2014 02:40:57

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
155.33.16.124 On: Sat, 29 Nov 2014 02:40:57

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
155.33.16.124 On: Sat, 29 Nov 2014 02:40:57

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
155.33.16.124 On: Sat, 29 Nov 2014 02:40:57

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
155.33.16.124 On: Sat, 29 Nov 2014 02:40:57

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
155.33.16.124 On: Sat, 29 Nov 2014 02:40:57

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
155.33.16.124 On: Sat, 29 Nov 2014 02:40:57

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
155.33.16.124 On: Sat, 29 Nov 2014 02:40:57

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
155.33.16.124 On: Sat, 29 Nov 2014 02:40:57