Electronic Structure and Triplet–Triplet Energy Transfer in Artificial Photosynthetic Antennas

Marely E. Tejeda-Ferrari, Chelsea L. Brown, Gabriela C.C.C. Coutinho, Ghabriel A. Gomes de Sá, Julio L. Palma, Manuel J. Llansola-Portoles, Gerdenis Kodis, Vladimiro Mujica, Junming Ho, Devens Gust, Thomas Moore, Ana Moore

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Three Pd(II) phthalocyanine–carotenoid dyads featuring chromophores linked by amide bonds were prepared in order to investigate the rate of triplet–triplet (T-T) energy transfer from the tetrapyrrole to the covalently attached carotenoid as a function of the number of conjugated double bonds in the carotenoid. Carotenoids having 9, 10 and 11 conjugated double bonds were studied. Transient absorption measurements show that intersystem crossing in the Pd(II) phthalocyanine takes place in 10 ps in each case and that T-T energy transfer occurs in 126, 81 and 132 ps in the dyads bearing 9, 10 and 11 double bond carotenoids, respectively. To identify the origin of this variation in T-T energy transfer rates, density functional theory (DFT) was used to calculate the T-T electronic coupling in the three dyads. According to the calculations, the primary reason for the observed T-T energy transfer trend is larger T-T electronic coupling between the tetrapyrrole and the 10-double bond carotenoid. A methyl group adjacent to the amide linker that connects the Pd(II) phthalocyanine and the carotenoid in the 9 and 11-double bond carotenoids is absent in the 10-double bond carotenoid, and this difference alters its electronic structure to increase the coupling.

Original languageEnglish (US)
JournalPhotochemistry and Photobiology
DOIs
StateAccepted/In press - Jan 1 2018

Fingerprint

carotenoids
Energy Transfer
Carotenoids
Energy transfer
Electronic structure
antennas
energy transfer
Antennas
electronic structure
Tetrapyrroles
Amides
amides
Bearings (structural)
Chromophores
electronics
chromophores
Density functional theory
density functional theory
trends

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry

Cite this

Tejeda-Ferrari, M. E., Brown, C. L., Coutinho, G. C. C. C., Gomes de Sá, G. A., Palma, J. L., Llansola-Portoles, M. J., ... Moore, A. (Accepted/In press). Electronic Structure and Triplet–Triplet Energy Transfer in Artificial Photosynthetic Antennas. Photochemistry and Photobiology. https://doi.org/10.1111/php.12979

Electronic Structure and Triplet–Triplet Energy Transfer in Artificial Photosynthetic Antennas. / Tejeda-Ferrari, Marely E.; Brown, Chelsea L.; Coutinho, Gabriela C.C.C.; Gomes de Sá, Ghabriel A.; Palma, Julio L.; Llansola-Portoles, Manuel J.; Kodis, Gerdenis; Mujica, Vladimiro; Ho, Junming; Gust, Devens; Moore, Thomas; Moore, Ana.

In: Photochemistry and Photobiology, 01.01.2018.

Research output: Contribution to journalArticle

Tejeda-Ferrari ME, Brown CL, Coutinho GCCC, Gomes de Sá GA, Palma JL, Llansola-Portoles MJ et al. Electronic Structure and Triplet–Triplet Energy Transfer in Artificial Photosynthetic Antennas. Photochemistry and Photobiology. 2018 Jan 1. https://doi.org/10.1111/php.12979
Tejeda-Ferrari, Marely E. ; Brown, Chelsea L. ; Coutinho, Gabriela C.C.C. ; Gomes de Sá, Ghabriel A. ; Palma, Julio L. ; Llansola-Portoles, Manuel J. ; Kodis, Gerdenis ; Mujica, Vladimiro ; Ho, Junming ; Gust, Devens ; Moore, Thomas ; Moore, Ana. / Electronic Structure and Triplet–Triplet Energy Transfer in Artificial Photosynthetic Antennas. In: Photochemistry and Photobiology. 2018.
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