Insights into the different mechanistic stages of light-induced hydrogen evolution of a 5,5 '-bisphenanthroline linked RuPt complex

Laemmle M, Pilz TD, Kutta RJ, Muessler M, Mengele AK, Goerls H, Heinemann FW, Rau S (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Dalton Transactions Royal Society of Chemistry

DOI: 10.1039/d2dt01727j

Abstract

Herein, the synthesis in conjunction with the structural, electrochemical, and photophysical characterization of a 5,5'-bisphenanthroline (phenphen) linked heterodinuclear RuPt complex (Ru(phenphen)Pt) and its light-driven hydrogen formation activity are reported. A single crystal X-ray diffraction (SC-XRD) analysis identified a perpendicular orientation of the two directly linked 1,10-phenanthroline moieties. The disruption of pi-conjugation blocks intramolecular electron transfer as evidenced by a comparative time-resolved optical spectroscopy study of Ru(phenphen)Pt and the reference complexes Ru(phenphen) and Ru(phenphen)Ru. However, reductive quenching is observed in the presence of an external electron donor such as triethylamine. Irradiating Ru(phenphen)Pt with visible light (470 nm) leads to H-2 formation. We discuss a potential mechanism that mainly proceeds via Pt colloids and provide indications that initial hydrogen generation may also proceed via a molecular pathway. As previous reports on related heterodinuclear RuPt-based photocatalysts revealed purely molecular hydrogen evolution, the present work thus highlights the role of the bridging ligand in stabilizing the catalytic center and consequently determining the mechanism of light-induced hydrogen evolution in these systems.

Authors with CRIS profile

Frank Wilhelm Heinemann Lehrstuhl für Anorganische und Allgemeine Chemie

Involved external institutions

Universität Ulm DE Germany (DE) Universität Regensburg DE Germany (DE) Friedrich-Schiller-Universität Jena DE Germany (DE)

How to cite

APA:

Laemmle, M., Pilz, T.D., Kutta, R.J., Muessler, M., Mengele, A.K., Goerls, H.,... Rau, S. (2022). Insights into the different mechanistic stages of light-induced hydrogen evolution of a 5,5 '-bisphenanthroline linked RuPt complex. Dalton Transactions. https://dx.doi.org/10.1039/d2dt01727j

MLA:

Laemmle, Martin, et al. "Insights into the different mechanistic stages of light-induced hydrogen evolution of a 5,5 '-bisphenanthroline linked RuPt complex." Dalton Transactions (2022).

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