Tuning of photocatalytic activity by creating a tridentate coordination sphere for palladium

Pfeffer MG, Zedler L, Kupfer S, Paul M, Schwalbe M, Peuntinger K, Guldi DM, Guthmuller J, Popp J, Gräfe S, Dietzek B, Rau S (2014)

Publication Type: Journal article

Publication year: 2014

Journal

Dalton Transactions Royal Society of Chemistry

Book Volume: 43

Pages Range: 11676-11686

Journal Issue: 30

DOI: 10.1039/c4dt01034e

Abstract

The synthesis and characterisation of an asymmetric potential bridging ligand bmptpphz (bmptpphz = 2,17-bis(4-methoxyphenyl)tetrapyrido[3,2-a:2′, 3′-c:3′′,2′′-h:2′′′, 3′′′-j] phenazine) is presented. This ligand contains a 1,10-phenanthroline (phen) and a 2,9-disubstituted phen sphere and possesses a strong absorbance in the visible. Facile coordination of the phen sphere to a Ru(tbbpy)2 core leads to Ru(bmptpphz) ([(tbbpy) 2Ru(bmptpphz)](PF6)2; tbbpy = 4,4′-di-tert-butyl-2,2′-bipyridine). UV-vis, emission, resonance Raman and theoretical investigations show that this complex possesses all properties associated with a Ru(tpphz) ([(tbbpy)2Ru(tpphz)](PF 6)2; tpphz = tetrapyrido[3,2-a:2′,3′-c: 3′′,2′′-h:2′′′,3′′′- j] phenazine) moiety and that the ligand based absorbances in the vis-part also populate an MLCT like state. The coordination of a Pd-core in the new 2,9-disubstituted phen sphere is possible, leading to a cyclometallation. The tridentate complexation leads to changes in the UV-vis and emission behaviour. Furthermore, the stability of the Pd-coordination is significantly enhanced if compared to the unsubstituted Ru(tpphz). Ru(bmptpphz)PdCl proved to be an active photocatalyst for H2 evolution, albeit with lower activity than the mother compound Ru(tpphz)PdCl2. This journal is © the Partner Organisations 2014.

Authors with CRIS profile

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

Involved external institutions

Friedrich-Schiller-Universität Jena DE Germany (DE) Universität Ulm DE Germany (DE) Humboldt-Universität zu Berlin DE Germany (DE) Gdańsk University of Technology (GUT) / Politechnika Gdańska PL Poland (PL)

How to cite

APA:

Pfeffer, M.G., Zedler, L., Kupfer, S., Paul, M., Schwalbe, M., Peuntinger, K.,... Rau, S. (2014). Tuning of photocatalytic activity by creating a tridentate coordination sphere for palladium. Dalton Transactions, 43(30), 11676-11686. https://doi.org/10.1039/c4dt01034e

MLA:

Pfeffer, M. G., et al. "Tuning of photocatalytic activity by creating a tridentate coordination sphere for palladium." Dalton Transactions 43.30 (2014): 11676-11686.

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