Preprint Article Version 1 This version is not peer-reviewed

Post Synthetic Defect Engineering of UiO-66 Metal-Organic Framework with Iridium(III)-HEDTA Complex and Application in Catalysis for Water Oxydation

Version 1 : Received: 9 August 2019 / Approved: 12 August 2019 / Online: 12 August 2019 (11:53:55 CEST)

A peer-reviewed article of this Preprint also exists.

Gatto, G.; Macchioni, A.; Bondi, R.; Marmottini, F.; Costantino, F. Post Synthetic Defect Engineering of UiO-66 Metal–Organic Framework with An Iridium(III)-HEDTA Complex and Application in Water Oxidation Catalysis. Inorganics 2019, 7, 123. Gatto, G.; Macchioni, A.; Bondi, R.; Marmottini, F.; Costantino, F. Post Synthetic Defect Engineering of UiO-66 Metal–Organic Framework with An Iridium(III)-HEDTA Complex and Application in Water Oxidation Catalysis. Inorganics 2019, 7, 123.

Journal reference: Inorganics 2019, 7, 123
DOI: 10.3390/inorganics7100123

Abstract

Clean production of renewable fuels is a great challenge of our scientific community. Iridium complexes have demonstrated a superior catalytic activity in the water oxidation (WO) reaction, which is a crucial step in water splitting process. Herein we have used a defective zirconium MOF with UiO-66 structure as support of a highly active Ir complex based on EDTA with formula [Ir(HEDTA)Cl]Na. The defects are induced by the partial substitution of tereftalic acid with smaller formiate groups. Anchoring of the complex occurs through a post-synthetic exchange of formiate anions, coordinated at the zirconium clusters of the MOF, with the free carboxylate group of the [Ir(HEDTA)Cl]-complex. The modified material was tested as heterogenous catalyst for the WO reaction by using Cerium Ammonium Nitrate as sacrificial agent. Although TOF and TON values are comparable to those of other iridium heterogenized catalysts, the MOF exhibits iridium leaching not limited at the first catalytic run, as usually observed, suggesting a lack of stability of the hybrid system under strong oxidative conditions.

Subject Areas

Metal-Organic Framework; Post-Synthetic Modification; Iridium Catalysis; Water Oxidation; Water Splitting

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