The gold porphyrin first excited singlet state

Joakim Andréasson, Gerdenis Kodis, Su Lin, Ana L Moore, Thomas A Moore, John Devens Gust, Jerker Mårtensson, Bo Albinsson

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Gold porphyrins are often used as electron-accepting chromophores in artificial photosynthetic constructs. Because of the heavy atom effect, the gold porphyrin first-excited singlet state undergoes rapid intersystem crossing to form the triplet state. The lowest triplet state can undergo a reduction by electron donation from a nearby porphyrin or another moiety. In addition, it can be involved in triplet-triplet energy transfer interactions with other chromophores. In contrast, little has been known about the short-lived singlet excited state. In this work, ultrafast time-resolved absorption spectroscopy has been used to investigate the singlet excited state of Au(III) 5,15-bis(3,5-di-t-butylphenyl)-2,8,12,18,-tetraethyl-3,7,13, 17-tetramethylporphyrin in ethanol solution. The excited singlet state is found to form with the laser pulse and decay with a time constant of 240 fs to give the triplet state. The triplet returns to the ground state with a lifetime of 400 ps. The lifetime of the singlet state is comparable with the time constants for energy and photoinduced electron transfer in some model and natural photosynthetic systems. Thus, it is kinetically competent to take part in such processes in suitably designed supermolecular systems.

Original languageEnglish
Pages (from-to)47-50
Number of pages4
JournalPhotochemistry and Photobiology
Volume76
Issue number1
DOIs
Publication statusPublished - Jul 1 2002

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Porphyrins
Excited states
porphyrins
Gold
Electrons
gold
atomic energy levels
Chromophores
chromophores
time constant
excitation
Energy Transfer
life (durability)
Spectrum Analysis
Lasers
Ethanol
Absorption spectroscopy
Energy transfer
Ground state
Laser pulses

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Biophysics

Cite this

The gold porphyrin first excited singlet state. / Andréasson, Joakim; Kodis, Gerdenis; Lin, Su; Moore, Ana L; Moore, Thomas A; Gust, John Devens; Mårtensson, Jerker; Albinsson, Bo.

In: Photochemistry and Photobiology, Vol. 76, No. 1, 01.07.2002, p. 47-50.

Research output: Contribution to journalArticle

Andréasson, Joakim ; Kodis, Gerdenis ; Lin, Su ; Moore, Ana L ; Moore, Thomas A ; Gust, John Devens ; Mårtensson, Jerker ; Albinsson, Bo. / The gold porphyrin first excited singlet state. In: Photochemistry and Photobiology. 2002 ; Vol. 76, No. 1. pp. 47-50.
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