Intramolecular proton transfer boosts water oxidation catalyzed by a Ru complex
Abstract
We introduce a new family of complexes with the general formula [Run(tda)(py)2]m+ (n = 2, m = 0, 1; n = 3, m = 1, 2+; n = 4, m = 2, 32+), with tda2– being [2,2':6',2"-terpyridine]-6,6"-dicarboxylate, including complex [RuIV(OH)(tda-κ-N3O)(py)2]+, 4H+, which we find to be an impressive water oxidation catalyst, formed by hydroxo coordination to 32+ under basic conditions. The complexes are synthesized, isolated, and thoroughly characterized by analytical, spectroscopic (UV–vis, nuclear magnetic resonance, electron paramagnetic resonance), computational, and electrochemical techniques (cyclic voltammetry, differential pulse voltammetry, coulometry), including solid-state monocrystal X-ray diffraction analysis. In oxidation state IV, the Ru center is seven-coordinated and diamagnetic, whereas in oxidation state II, the complex has an unbonded dangling carboxylate and is six-coordinated while still diamagnetic. With oxidation state III, the coordination number is halfway between the coordination of oxidation states II and IV. Species generated in situ have also been characterized by spectroscopic, computational, and electrochemical techniques, together with the related species derived from a different degree of protonation and oxidation states. 4H+ can be generated potentiometrically, or voltammetrically, from 32+, and both coexist in solution. While complex 32+ is not catalytically active, the catalytic performance of complex 4H+ is characterized bymore »
- Authors:
-
- Institute of Chemical Research of Catalonia (ICIQ), Tarragona (Spain)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Univ. de Valencia, Paterna (Spain)
- Yale Univ., New Haven, CT (United States)
- Univ. Autonoma de Barcelona, Barcelona (Spain)
- Institute of Chemical Research of Catalonia (ICIQ), Tarragona (Spain); Univ. Autonoma de Barcelona, Barcelona (Spain)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1226070
- Report Number(s):
- BNL-108552-2015-JA
Journal ID: ISSN 0002-7863; R&D Project: CO045; KC0301020
- Grant/Contract Number:
- SC00112704
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Journal of the American Chemical Society
- Additional Journal Information:
- Journal Volume: 137; Journal Issue: 33; Journal ID: ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Ru complexes; seven coordination; redox properties; water oxidation catalysis; electrocatalysis; water splitting; intramolecular proton transfer
Citation Formats
Matheu, Roc, Ertem, Mehmed Z., Benet-Buchholz, J., Coronado, Eugenio, Batista, Victor S., Sala, Xavier, and Llobet, Antoni. Intramolecular proton transfer boosts water oxidation catalyzed by a Ru complex. United States: N. p., 2015.
Web. doi:10.1021/jacs.5b06541.
Matheu, Roc, Ertem, Mehmed Z., Benet-Buchholz, J., Coronado, Eugenio, Batista, Victor S., Sala, Xavier, & Llobet, Antoni. Intramolecular proton transfer boosts water oxidation catalyzed by a Ru complex. United States. https://doi.org/10.1021/jacs.5b06541
Matheu, Roc, Ertem, Mehmed Z., Benet-Buchholz, J., Coronado, Eugenio, Batista, Victor S., Sala, Xavier, and Llobet, Antoni. 2015.
"Intramolecular proton transfer boosts water oxidation catalyzed by a Ru complex". United States. https://doi.org/10.1021/jacs.5b06541. https://www.osti.gov/servlets/purl/1226070.
@article{osti_1226070,
title = {Intramolecular proton transfer boosts water oxidation catalyzed by a Ru complex},
author = {Matheu, Roc and Ertem, Mehmed Z. and Benet-Buchholz, J. and Coronado, Eugenio and Batista, Victor S. and Sala, Xavier and Llobet, Antoni},
abstractNote = {We introduce a new family of complexes with the general formula [Run(tda)(py)2]m+ (n = 2, m = 0, 1; n = 3, m = 1, 2+; n = 4, m = 2, 32+), with tda2– being [2,2':6',2"-terpyridine]-6,6"-dicarboxylate, including complex [RuIV(OH)(tda-κ-N3O)(py)2]+, 4H+, which we find to be an impressive water oxidation catalyst, formed by hydroxo coordination to 32+ under basic conditions. The complexes are synthesized, isolated, and thoroughly characterized by analytical, spectroscopic (UV–vis, nuclear magnetic resonance, electron paramagnetic resonance), computational, and electrochemical techniques (cyclic voltammetry, differential pulse voltammetry, coulometry), including solid-state monocrystal X-ray diffraction analysis. In oxidation state IV, the Ru center is seven-coordinated and diamagnetic, whereas in oxidation state II, the complex has an unbonded dangling carboxylate and is six-coordinated while still diamagnetic. With oxidation state III, the coordination number is halfway between the coordination of oxidation states II and IV. Species generated in situ have also been characterized by spectroscopic, computational, and electrochemical techniques, together with the related species derived from a different degree of protonation and oxidation states. 4H+ can be generated potentiometrically, or voltammetrically, from 32+, and both coexist in solution. While complex 32+ is not catalytically active, the catalytic performance of complex 4H+ is characterized by the foot of the wave analysis, giving an impressive turnover frequency record of 8000 s–1 at pH 7.0 and 50,000 s–1 at pH 10.0. Density functional theory calculations provide a complete description of the water oxidation catalytic cycle of 4H+, manifesting the key functional role of the dangling carboxylate in lowering the activation free energies that lead to O–O bond formation.},
doi = {10.1021/jacs.5b06541},
url = {https://www.osti.gov/biblio/1226070},
journal = {Journal of the American Chemical Society},
issn = {0002-7863},
number = 33,
volume = 137,
place = {United States},
year = {Thu Jul 30 00:00:00 EDT 2015},
month = {Thu Jul 30 00:00:00 EDT 2015}
}
Web of Science
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Optimization of Synthetically Versatile Pyridylidene Amide Ligands for Efficient Iridium-Catalyzed Water Oxidation
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