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Rahaman A, Ghosh S, Basak-Modi S, Abdel-Magied AF, Kabir SE, Haukka M, Richmond MG, Lisensky GC, Nordlander E, Hogarth G. Chalcogenide-capped triiron clusters [Fe3(CO)9(μ3-E)2], [Fe3(CO)7(μ3-CO)(μ3-E)(μ-dppm)] and [Fe3(CO)7(μ3-E)2(μ-dppm)] (E = S, Se) as proton-reduction catalysts. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2018.10.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Rahaman A, Gimbert-Suriñach C, Ficks A, Ball GE, Bhadbhade M, Haukka M, Higham L, Nordlander E, Colbran SB. Bridgehead isomer effects in bis(phosphido)-bridged diiron hexacarbonyl proton reduction electrocatalysts. Dalton Trans 2017; 46:3207-3222. [PMID: 28221379 DOI: 10.1039/c6dt01494a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The influence of the substitution, orientation and structure of the phosphido bridges in [Fe2(CO)6(μ-PR2)2] electrocatalysts of proton reduction has been studied. The isomers e,a-[Fe2(CO)6{μ-P(Ar)H}2] (1a(Ar): Ar = Ph, 2'-methoxy-1,1'-binaphthyl (bn')), e,e-[Fe2(CO)6{μ-P(Ar)H}2] (1b(Ar): Ar = Ph, bn') were isolated from reactions of iron pentacarbonyl and the corresponding primary phosphine, syntheses that also afforded the phosphinidene-capped tri-iron clusters, [Fe3(CO)9(μ-CO)(μ3-Pbn')] (2) and [Fe3(CO)9(μ3-PAr)2] (3(Ar), Ar = Ph, bn'). A ferrocenyl (Fc)-substituted dimer [Fe2(CO)6{μ:μ'-1,2-(P(CH2Fc)CH2)2C6H4}] (4), in which the two phosphido bridges are linked by an o-xylyl group, was also prepared. The molecular structures of complexes 1a(Ph), 1b(Ph), 1b(bn'), 2 and 4 were established by X-ray crystallography. All complexes have been examined as electrocatalysts for proton reduction using p-toluene sulfonic acid in tetrahydrofuran. Cyclic voltammograms of the dimers with acid exhibit two catalysis waves for proton reduction. The first wave, which appears at the potential of the primary reduction, reaches maximum current (turnover) at moderate acid concentrations and is rapidly overtaken by the second wave, which appears at more negative potential. Both of these reductive waves show an initial first order dependence on acid. The electrochemistry and electrocatalyses of the [Fe2(CO)6(μ-PR2)2] dimers show subtle variations with the nature of the bridging phosphido group(s), including the orientation of bridgehead hydrogen atoms.
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Affiliation(s)
- Ahibur Rahaman
- Chemical Physics, Department of Chemistry, Lund University, Box 120, SE-221 00 Lund, Sweden.
| | | | - Arne Ficks
- School of Chemistry, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Graham E Ball
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Mohan Bhadbhade
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Matti Haukka
- Department of Chemistry, University of Jyväskylä, Box 111, FI-40014, Jyväskylä, Finland
| | - Lee Higham
- School of Chemistry, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Ebbe Nordlander
- Chemical Physics, Department of Chemistry, Lund University, Box 120, SE-221 00 Lund, Sweden.
| | - Stephen B Colbran
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.
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Shi YC, Wang S, Xie S. Syntheses, molecular structures, and self-assemblies of SFe3, S2Fe3, S3Fe5, SeFe3, and Se2Fe3 clusters with chelating diaminocarbenes. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1079312] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Yao-Cheng Shi
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, PR China
| | - Shuai Wang
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, PR China
| | - Sun Xie
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, PR China
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