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Hydrogen storage and evolution catalysed by metal hydride complexes
- Title
- Hydrogen storage and evolution catalysed by metal hydride complexes
- Authors
- Fukuzumi S.; Suenobu T.
- Ewha Authors
- Shunichi Fukuzumi
- SCOPUS Author ID
- Shunichi Fukuzumi


- Issue Date
- 2013
- Journal Title
- Dalton Transactions
- ISSN
- 1477-9226
- Citation
- Dalton Transactions vol. 42, no. 1, pp. 18 - 28
- Indexed
- SCI; SCIE; SCOPUS

- Document Type
- Review
- Abstract
- The storage and evolution of hydrogen are catalysed by appropriate metal hydride complexes. Hydrogenation of carbon dioxide by hydrogen is catalysed by a [C,N] cyclometalated organoiridium complex, [IrIII(Cp*)(4-(1H- pyrazol-1-yl-κN2)benzoic acid-κC3)(OH 2)]2SO4 [Ir-OH2]2SO 4, under atmospheric pressure of H2 and CO2 in weakly basic water (pH 7.5) at room temperature. The reverse reaction, i.e., hydrogen evolution from formate, is also catalysed by [Ir-OH2] + in acidic water (pH 2.8) at room temperature. Thus, interconversion between hydrogen and formic acid in water at ambient temperature and pressure has been achieved by using [Ir-OH2]+ as an efficient catalyst in both directions depending on pH. The Ir complex [Ir-OH 2]+ also catalyses regioselective hydrogenation of the oxidised form of β-nicotinamide adenine dinucleotide (NAD+) to produce the 1,4-reduced form (NADH) under atmospheric pressure of H2 at room temperature in weakly basic water. In weakly acidic water, the complex [Ir-OH2]+ also catalyses the reverse reaction, i.e., hydrogen evolution from NADH to produce NAD+ at room temperature. Thus, interconversion between NADH (and H+) and NAD+ (and H2) has also been achieved by using [Ir-OH2]+ as an efficient catalyst and by changing pH. The iridium hydride complex formed by the reduction of [Ir-OH2]+ by H2 and NADH is responsible for the hydrogen evolution. Photoirradiation (λ > 330 nm) of an aqueous solution of the Ir-hydride complex produced by the reduction of [Ir-OH2]+ with alcohols resulted in the quantitative conversion to a unique [C,C] cyclometalated Ir-hydride complex, which can catalyse hydrogen evolution from alcohols in a basic aqueous solution (pH 11.9). The catalytic mechanisms of the hydrogen storage and evolution are discussed by focusing on the reactivity of Ir-hydride complexes. © The Royal Society of Chemistry 2013.
- DOI
- 10.1039/c2dt31823g
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
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