Ruthenium Complexes with Strongly Electron-Donating Terpyridine Ligands: Effect of the Working Electrode on Electrochemical and Spectroelectrochemical Properties

Chemistry : a European Journal
Johannes KleinBiprajit Sarkar

Abstract

The combination of 2,2':6',2''-terpyridines (tpy) and RuII is known to deliver molecular and supramolecular assemblies with remarkable properties. Here new RuII complexes, with modified tpy ligands substituted with varying numbers of dimethlyamino groups, are presented. Electrochemistry shows that the incorporation of the strongly electron-donating groups on the tpy ligands leads to a negative shift of the RuII oxidation potential by close to 1 V. The reductive electrochemical responses are strongly dependent on the nature of the working electrode, with glassy carbon and gold working electrodes showing the best results. These observations led to the development of a modified Optically Transparent Thin Layer Electrochemical (OTTLE) cell, based on a gold working electrode. The use of UV/Vis/NIR spectroelectrochemical methods with that OTTLE cell, together with simulations of the cyclic voltammograms, allowed the characterization of four reduction steps in these complexes, the final two of which lead to bond activations at the ruthenium center. This observation is to the best of our knowledge unprecedented in coordinatively saturated complexes of type [Ru(tpy)2 ]2+ . The various redox states of the complexes were characterized by ...Continue Reading

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Citations

Jul 18, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Sebastian SobottkaBiprajit Sarkar
Oct 1, 2020·Chemistry : a European Journal·Philipp RietschSiegfried Eigler
Jul 3, 2021·Angewandte Chemie·Nikita KolobovJorge Gascon

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