Hydrogen Liberation from Formic Acid Mediated by Efficient Iridium(III) Catalysts Bearing Pyridine-Carboxamide Ligands

Gabriel Menendez Rodriguez; Chiara Domestici; Alberto Bucci; Massimiliano Valentini; Cristiano Zuccaccia; Alceo Macchioni

doi:10.1002/ejic.201701458

Hydrogen Liberation from Formic Acid Mediated by Efficient Iridium(III) Catalysts Bearing Pyridine-Carboxamide Ligands

Gabriel Menendez Rodriguez, Chiara Domestici, Alberto Bucci, Massimiliano Valentini, Cristiano Zuccaccia, Alceo Macchioni^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Herein it is shown that complexes [Cp*Ir(R-pica)Cl] {R-pica = R-picolinamidate = κ²-R-pyridine-2-carboxamide ion (–1), 1 R = H and 2 R = Me} catalyze the liberation of H₂ from formic acid (FA) in water, at ambient temperature and pressure, in the absence of any addictive/promoter, with performances comparable with those of the best catalysts reported so far. TOF values approaching 30000 h^–1 were observed for 1 and 2 (pH = 3.7, [HCOOH] + [HCOO^–] = 1 m, [Cat] = 250 µm, T = 60 °C), whereas the TON was only limited by the amount of HCOOH used and by the increase of pH with the progress of reaction, which makes the protonation of Ir–H less probable.

Original language	English
Pages (from-to)	2247-2250
Number of pages	4
Journal	European Journal of Inorganic Chemistry
Volume	2018
Issue number	20
DOIs	https://doi.org/10.1002/ejic.201701458
Publication status	Published - Jun 7 2018

Keywords

Dehydrogenation
H production
Homogeneous catalysis
Iridium

ASJC Scopus subject areas

Inorganic Chemistry

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10.1002/ejic.201701458

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title = "Hydrogen Liberation from Formic Acid Mediated by Efficient Iridium(III) Catalysts Bearing Pyridine-Carboxamide Ligands",

abstract = "Herein it is shown that complexes [Cp*Ir(R-pica)Cl] {R-pica = R-picolinamidate = κ2-R-pyridine-2-carboxamide ion (–1), 1 R = H and 2 R = Me} catalyze the liberation of H2 from formic acid (FA) in water, at ambient temperature and pressure, in the absence of any addictive/promoter, with performances comparable with those of the best catalysts reported so far. TOF values approaching 30000 h–1 were observed for 1 and 2 (pH = 3.7, [HCOOH] + [HCOO–] = 1 m, [Cat] = 250 µm, T = 60 °C), whereas the TON was only limited by the amount of HCOOH used and by the increase of pH with the progress of reaction, which makes the protonation of Ir–H less probable.",

keywords = "Dehydrogenation, H production, Homogeneous catalysis, Iridium",

author = "{Menendez Rodriguez}, Gabriel and Chiara Domestici and Alberto Bucci and Massimiliano Valentini and Cristiano Zuccaccia and Alceo Macchioni",

note = "Publisher Copyright: {\textcopyright} 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2018",

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doi = "10.1002/ejic.201701458",

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T1 - Hydrogen Liberation from Formic Acid Mediated by Efficient Iridium(III) Catalysts Bearing Pyridine-Carboxamide Ligands

AU - Menendez Rodriguez, Gabriel

AU - Domestici, Chiara

AU - Bucci, Alberto

AU - Valentini, Massimiliano

AU - Zuccaccia, Cristiano

AU - Macchioni, Alceo

PY - 2018/6/7

Y1 - 2018/6/7

N2 - Herein it is shown that complexes [Cp*Ir(R-pica)Cl] {R-pica = R-picolinamidate = κ2-R-pyridine-2-carboxamide ion (–1), 1 R = H and 2 R = Me} catalyze the liberation of H2 from formic acid (FA) in water, at ambient temperature and pressure, in the absence of any addictive/promoter, with performances comparable with those of the best catalysts reported so far. TOF values approaching 30000 h–1 were observed for 1 and 2 (pH = 3.7, [HCOOH] + [HCOO–] = 1 m, [Cat] = 250 µm, T = 60 °C), whereas the TON was only limited by the amount of HCOOH used and by the increase of pH with the progress of reaction, which makes the protonation of Ir–H less probable.

AB - Herein it is shown that complexes [Cp*Ir(R-pica)Cl] {R-pica = R-picolinamidate = κ2-R-pyridine-2-carboxamide ion (–1), 1 R = H and 2 R = Me} catalyze the liberation of H2 from formic acid (FA) in water, at ambient temperature and pressure, in the absence of any addictive/promoter, with performances comparable with those of the best catalysts reported so far. TOF values approaching 30000 h–1 were observed for 1 and 2 (pH = 3.7, [HCOOH] + [HCOO–] = 1 m, [Cat] = 250 µm, T = 60 °C), whereas the TON was only limited by the amount of HCOOH used and by the increase of pH with the progress of reaction, which makes the protonation of Ir–H less probable.

KW - Dehydrogenation

KW - H production

KW - Homogeneous catalysis

KW - Iridium

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DO - 10.1002/ejic.201701458

M3 - Article

AN - SCOPUS:85048042068

SN - 1434-1948

VL - 2018

SP - 2247

EP - 2250

JO - European Journal of Inorganic Chemistry

JF - European Journal of Inorganic Chemistry

IS - 20

ER -

Hydrogen Liberation from Formic Acid Mediated by Efficient Iridium(III) Catalysts Bearing Pyridine-Carboxamide Ligands

Abstract

Keywords

ASJC Scopus subject areas

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