Modified bibenzimidazole ligands as spectator ligands in photoactive molecular functional Ru-polypyridine units? Implications from spectroscopy

Julia Meyer-Ilse; Stefan Bauroth; Maximilian Bräutigam; Michael Schmitt; Jürgen Popp; Rainer Beckert; Nils Rockstroh; T. David Pilz; Katharina Monczak; Frank W. Heinemann; Sven Rau; Benjamin Dietzek

doi:10.1039/C4DT01399A

Modified bibenzimidazole ligands as spectator ligands in photoactive molecular functional Ru-polypyridine units? Implications from spectroscopy†

Julia Meyer-Ilse,^ab Stefan Bauroth,^ab Maximilian Bräutigam,^ab Michael Schmitt,^a Jürgen Popp,^ab Rainer Beckert,^c Nils Rockstroh,^d T. David Pilz,^d Katharina Monczak,^e Frank W. Heinemann,^d Sven Rau^de and Benjamin Dietzek*^ab

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^a Institute of Physical Chemistry and Jena Center for Soft Matter, Friedrich-Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
E-mail: benjamin.dietzek@uni-jena.de
Fax: +49 (0)3641 206399
Tel: +49 (0)3641 206332

^b Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Straße 9, 07745 Jena, Germany
E-mail: benjamin.dietzek@ipht-jena.de
Fax: +49 (0)3641 206399
Tel: +49 (0)3641 206332

^c Institute of Organic Chemistry and Macromolecular Chemistry, Humboldtstr. 8, 07743 Jena, Germany

^d Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nuremberg, Egerlandstr. 3, 91058 Erlangen, Germany

^e Institute of Inorganic Chemistry, University Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany

Abstract

The photophysical properties of Ruthenium-bipyridine complexes bearing a bibenzimidazole ligand were investigated. The nitrogens on the bibenzimidazole-ligand were protected, by adding either a phenylene group or a 1,2-ethandiyl group, to remove the photophysical dependence of the complex on the protonation state of the bibenzimidazole ligand. This protection results in the bibenzimidazole ligand contributing to the MLCT transition, which is experimentally evidenced by (resonance) Raman scattering in concert with DFT calculations for a detailed mode assignment in the (resonance) Raman spectra.

This article is part of the themed collection: Spectroscopy of Inorganic Excited States

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Modified bibenzimidazole ligands as spectator ligands in photoactive molecular functional Ru-polypyridine units? Implications from spectroscopy†

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Modified bibenzimidazole ligands as spectator ligands in photoactive molecular functional Ru-polypyridine units? Implications from spectroscopy

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