Photoinduced charge transfer in porphyrin-cobaloxime and corrole-cobaloxime hybrids

Peuntinger K, Lazarides T, Dafnomili D, Charalambidis G, Landrou G, Kahnt A, Sabatini RP, Mccamant DW, Gryko DT, Coutsolelos AG, Guldi DM (2013)

Publication Type: Journal article, Original article

Publication year: 2013

Journal

Journal of Physical Chemistry C American Chemical Society

Original Authors: Peuntinger K., Lazarides T., Dafnomili D., Charalambidis G., Landrou G., Kahnt A., Sabatini R.P., McCamant D.W., Gryko D.T., Coutsolelos A.G., Guldi D.M.

Publisher: American Chemical Society

Book Volume: 117

Pages Range: 1647-1655

Journal Issue: 4

DOI: 10.1021/jp311766s

Abstract

We report on the synthesis of hybrid molecules consisting of a porphyrin or corrole chromophore axially coordinated to a [Co(dmgH) (Cl)] (dmg = dimethylglyoxime) unit via a pyridine group as potential hydrogen forming entities in HO/THF medium. Photophysical, electrochemical, and pulse radiolysis studies on the hybrids and/or their separate components show that selective excitation of the porphyrin or corrole chromophore in its first singlet excited state leads to fast charge separation due to chromophore to cobalt electron transfer. However, this charge separation is followed by even faster charge recombination thereby preventing the accumulation of a reduced cobalt species which would lead to hydrogen production. It is important, nevertheless, that addition of a sacrificial electron donor slows the charge recombination down. In light of the latter it comes as hardly surprising that the photocatalysis experiments in the presence of a sacrificial electron donor (i.e., triethylamine) show modest rates of hydrogen production. © 2012 American Chemical Society.

Authors with CRIS profile

Katrin Peuntinger Lehrstuhl für Physikalische Chemie I Axel Kahnt Lehrstuhl für Physikalische Chemie I Dirk Michael Guldi Lehrstuhl für Physikalische Chemie I

Involved external institutions

University of Crete / Πανεπιστήμιο Κρήτης GR Greece (GR) Polska Akademia Nauk (PAN) / Polish Academy of Sciences PL Poland (PL) University of Rochester (UR) US United States (USA) (US)

How to cite

APA:

Peuntinger, K., Lazarides, T., Dafnomili, D., Charalambidis, G., Landrou, G., Kahnt, A.,... Guldi, D.M. (2013). Photoinduced charge transfer in porphyrin-cobaloxime and corrole-cobaloxime hybrids. Journal of Physical Chemistry C, 117(4), 1647-1655. https://doi.org/10.1021/jp311766s

MLA:

Peuntinger, Katrin, et al. "Photoinduced charge transfer in porphyrin-cobaloxime and corrole-cobaloxime hybrids." Journal of Physical Chemistry C 117.4 (2013): 1647-1655.

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