Volume 133, Issue 11 pp. 5787-5792
Zuschrift

Reactivity and Mechanisms of Photoactivated Heterometallic [RuIINiII] and [RuIINiIIRuII] Catalysts for Dihydrogen Generation from Water

Dr. Nour El Harakeh

Dr. Nour El Harakeh

Department of Chemistry, Wayne State University, Detroit, MI, 48202 USA

These authors contributed equally to this work.

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Dr. Ana C. P. de Morais

Dr. Ana C. P. de Morais

Instituto de Química, Universidade Federal Fluminense, 24020-141 Niterói, RJ, Brazil

These authors contributed equally to this work.

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Neha Rani

Neha Rani

Department of Chemistry, Indian Institute of Technology Jammu, Jammu, 181221 India

These authors contributed equally to this work.

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Dr. Javier A. G. Gomez

Dr. Javier A. G. Gomez

Instituto de Química, Universidade Federal Fluminense, 24020-141 Niterói, RJ, Brazil

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Abigail Cousino

Abigail Cousino

Department of Chemistry, Wayne State University, Detroit, MI, 48202 USA

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Prof. Mauricio Lanznaster

Corresponding Author

Prof. Mauricio Lanznaster

Instituto de Química, Universidade Federal Fluminense, 24020-141 Niterói, RJ, Brazil

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Prof. Shivnath Mazumder

Corresponding Author

Prof. Shivnath Mazumder

Department of Chemistry, Indian Institute of Technology Jammu, Jammu, 181221 India

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Prof. Cláudio N. Verani

Corresponding Author

Prof. Cláudio N. Verani

Department of Chemistry, Wayne State University, Detroit, MI, 48202 USA

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First published: 14 December 2020
Citations: 2

Dedicated to Professor Phalguni Chaudhuri

Abstract

Two heterometallic photocatalysts were designed and probed for water reduction. Both [(bpy)2RuIINiII(L1)](ClO4)2 (1) and [(bpy)2RuIINiII(L2)2RuII(bpy)2](ClO4)2 (2) can generate the low-valent precursor involved in hydride formation prior to dihydrogen generation. However, while the bimetallic [RuIINiII] (1) requires the presence of an external photosensitizer to trigger catalytic activity, the trimetallic [RuIINiIIRuII] (2) displays significant coupling between the catalytic and light-harvesting units to promote intramolecular multielectron transfer and perform photocatalysis at the Ni center. A concerted experimental and theoretical effort proposes mechanisms to explain why 1 is unable to achieve self-supported catalysis, while 2 is fully photocatalytic.

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