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1,10-Phenanthroline-dithiine iridium and ruthenium complexes: synthesis, characterization and photocatalytic dihydrogen evolution

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Abstract

We report the synthesis and the spectroscopic and electrochemical properties of six mononuclear iridium(III) and ruthenium(II) complexes bearing S,S'-extended phenanthroline ligands. Starting from 5,6-dibromide-1,10-phenanthroline, the dithiine derivatives N,N'-1,10-phenanthrolinedithiino[2,3-b]quinoxa-line and N,N'-1,10-phenanthrolinedithiino[2,3-b]benzene were prepared by primary N,N'-complexation of the dibromo derivative and subsequent nucleophilic substitution at the complex. The photoluminescence of the phenanthroline-dithiine containing complexes shows distinctively increased lifetimes for all Ir(III) and Ru(II) complexes. The activity of the series of Ir(III) and Ru(II) complexes as photosensitizers in visible-light photocatalytic water reduction is demonstrated by dihydrogen evolution with a [Fe3(CO)12] catalyst and triethylamine as a sacrificial donor.

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Acknowledgements

EE thanks the Landesgraduiertenförderung Mecklenburg-Vorpommern and the German Science Foundation (DFG) (GRK 1626, Chemical Photocatalysis) for the graduate scholarships. We thank Marco Tänzler for providing us the suitable crystals of 2-PF6.

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Authors and Affiliations

  1. Institute of Organic Chemistry, Faculty of Chemistry and Pharmacy, Universität Regensburg, Universitätsstraße 31, 93053, Regensburg, Germany

    E. Erdmann & B. König

  2. Institutfür Chemie, Universität Rostock, Albert-Einstein-Straße 3a, 18059, Rostock, Germany

    E. Erdmann, A. Villinger & W. W. Seidel

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  1. E. Erdmann
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  2. A. Villinger
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  3. B. König
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  4. W. W. Seidel
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Correspondence to W. W. Seidel.

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Erdmann, E., Villinger, A., König, B. et al. 1,10-Phenanthroline-dithiine iridium and ruthenium complexes: synthesis, characterization and photocatalytic dihydrogen evolution. Photochem Photobiol Sci 17, 1056–1067 (2018). https://doi.org/10.1039/c8pp00068a

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  • DOI: https://doi.org/10.1039/c8pp00068a

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