Volume 46, Issue 12 pp. 2094-2096

Communication

The Triplet State of Indigo^†

J. Sérgio Seixas de Melo Dr.

[email protected]

Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, Fax: (+351) 239-827-703 https://woc.uc.pt/quimica/person/ppgeral.do?idpessoa=23

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Hugh D. Burrows Prof. Dr.,

Hugh D. Burrows Prof. Dr.

Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, Fax: (+351) 239-827-703 https://woc.uc.pt/quimica/person/ppgeral.do?idpessoa=23

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Carlos Serpa Dr.,

Carlos Serpa Dr.

Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, Fax: (+351) 239-827-703 https://woc.uc.pt/quimica/person/ppgeral.do?idpessoa=23

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Luis G. Arnaut Prof. Dr.,

Luis G. Arnaut Prof. Dr.

Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, Fax: (+351) 239-827-703 https://woc.uc.pt/quimica/person/ppgeral.do?idpessoa=23

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J. Sérgio Seixas de Melo Dr.,

J. Sérgio Seixas de Melo Dr.

[email protected]

Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, Fax: (+351) 239-827-703 https://woc.uc.pt/quimica/person/ppgeral.do?idpessoa=23

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Hugh D. Burrows Prof. Dr.,

Hugh D. Burrows Prof. Dr.

Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, Fax: (+351) 239-827-703 https://woc.uc.pt/quimica/person/ppgeral.do?idpessoa=23

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Carlos Serpa Dr.,

Carlos Serpa Dr.

Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, Fax: (+351) 239-827-703 https://woc.uc.pt/quimica/person/ppgeral.do?idpessoa=23

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Luis G. Arnaut Prof. Dr.,

Luis G. Arnaut Prof. Dr.

Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, Fax: (+351) 239-827-703 https://woc.uc.pt/quimica/person/ppgeral.do?idpessoa=23

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First published: 02 March 2007

https://doi.org/10.1002/anie.200604679

Citations: 53

^†

Financial support from FEDER and FCT (project POCI/QUI/55672/2004) are acknowledged. C.S. acknowledges FCT for a grant SFRH/BPD/13297/2003. Dr. S. Navaratnam, Dr. R. Edge (FRRF, Daresbury Laboratory, UK), and J. Pina are acknowledged for their excellent technical support in the pulse radiolysis experiments. MnTPP was a kind gift from Dr. Marta Pineiro.

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Graphical Abstract

The elusive triplet state of indigo (see picture) has been fully characterized by energy-transfer pulse radiolysis and photoacoustic calorimetry. The triplet energy is (1.04±0.10) eV and the singlet-to-triplet intersystem crossing yield in solution is ϕ_ISC=0.0066. Inefficient intersystem crossing, low triplet energy, and fast internal conversion of the singlet state likely contribute to the high stability of indigo.

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Volume46, Issue12

March 12, 2007

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The Triplet State of Indigo^†