Ultrafast Relaxation Dynamics of Photoexcited Zinc-Porphyrin: Electronic-Vibrational Coupling

Abraham, Baxter; Nieto-Pescador, Jesus; Gundlach, Lars

doi:10.1021/acs.jpclett.6b01439

Title: Ultrafast Relaxation Dynamics of Photoexcited Zinc-Porphyrin: Electronic-Vibrational Coupling

Journal Article · Tue Aug 02 00:00:00 EDT 2016 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.6b01439· OSTI ID:1345807

Abraham, Baxter ^[1]; Nieto-Pescador, Jesus ^[2]; Gundlach, Lars ^[1]

Univ. of Delaware, Newark, DE (United States). Dept. of Chemistry and Biochemistry
Univ. of Delaware, Newark, DE (United States). Dept. of Physics and Astronomy

Cyclic tetrapyrroles are the active core of compounds with crucial roles in living systems, such as hemoglobin and chlorophyll, and in technology as photocatalysts and light absorbers for solar energy conversion. Zinc-tetraphenylporphyrin (Zn-TPP) is a prototypical cyclic tetrapyrrole that has been intensely studied in past decades. Because of its importance for photochemical processes the optical properties are of particular interest, and, accordingly, numerous studies have focused on light absorption and excited-state dynamics of Zn-TPP. Relaxation after photoexcitation in the Soret band involves internal conversion that is preceded by an ultrafast process. This relaxation process has been observed by several groups. Until now, it has not been established if it involves a higher lying ”dark” state or vibrational relaxation in the excited S₂ state. Here we combine high time resolution electronic and vibrational spectroscopy to show that this process constitutes vibrational relaxation in the anharmonic ₂ potential.

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Research Organization:: Univ. of Delaware, Newark, DE (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0016288

OSTI ID:: 1345807

Journal Information:: Journal of Physical Chemistry Letters, Vol. 7, Issue 16; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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