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Ab initio electronic and optical spectra of free-base porphyrins: The role of electronic correlation

AuthorsPalummo, Maurizia; Hogan, Conor; Sottile, Francesco; Bagalá, Paolo; Rubio, Angel
Issue Date24-Aug-2009
PublisherAmerican Institute of Physics
CitationJournal of Chemical Physics 131(8): 084102 (2009)
AbstractWe present a theoretical investigation of electronic and optical properties of free-base porphyrins based on density functional theory and many-body perturbation theory. The electronic levels of free-base porphine (H2P) and its phenyl derivative, free-base tetraphenylporphyrin (H2TPP) are calculated using the ab initio GW approximation for the self-energy. The approach is found to yield results that compare favorably with the available photoemission spectra. The excitonic nature of the optical peaks is revealed by solving the Bethe–Salpeter equation, which provides an accurate description of the experimental absorption spectra. The lowest triplet transition energies are in good agreement with the measured values.
Description7 pages, 8 figures, 2 tables.
Publisher version (URL)http://dx.doi.org/10.1063/1.3204938
Appears in Collections:(CFM) Artículos
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