Issue 36, 2020

Synthesis, UV-visible spectroelectrochemistry and theoretical characterization of new polypyridyl Ru(ii) complexes containing 2,4,6-tris(2-pyridyl)-1,3,5-triazine as precursors for water oxidation catalysts

Abstract

In this work, we report the syntheses and physicochemical characterization of new chloro and aqua complexes of Ru(II) with 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz) and 2,2′-bipyridines substituted with donor and acceptor groups in the 4,4′-positions. The aqua complexes behave as precursors for water oxidation catalysts at pH = 1 using Ce(IV) as a sacrificial oxidant. Besides, the oxidized forms Ru(IV) and Ru(V) have been characterized at different pH values by electrochemistry, UV-Visible spectroscopy and spectroelectrochemistry. The reaction mechanisms were studied by combining mixing and stopped-flow experiments with spectrophotometric monitoring in the UV-visible region and all the rate constants were determined together with the corresponding TON and TOF values at pH = 1. Calculations based on Density Functional Theory (DFT and TD-DFT) were performed to support the experimental data.

Graphical abstract: Synthesis, UV-visible spectroelectrochemistry and theoretical characterization of new polypyridyl Ru(ii) complexes containing 2,4,6-tris(2-pyridyl)-1,3,5-triazine as precursors for water oxidation catalysts

Supplementary files

Article information

Article type
Paper
Submitted
20 Jun 2020
Accepted
20 Aug 2020
First published
21 Aug 2020

Dalton Trans., 2020,49, 12742-12755

Synthesis, UV-visible spectroelectrochemistry and theoretical characterization of new polypyridyl Ru(II) complexes containing 2,4,6-tris(2-pyridyl)-1,3,5-triazine as precursors for water oxidation catalysts

S. E. Domínguez, F. E. Morán Vieyra and F. Fagalde, Dalton Trans., 2020, 49, 12742 DOI: 10.1039/D0DT02185G

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