The influence of phosphine ligand substituted [2Fe2S] model complexes as electro-catalyst on proton reduction1. Issue 74 (19th December 2018)

• Record Type: Journal Article
• Authors: Zhang, Xia; Ma, Xiaoyuan; Zhang, Tianyong; Li, Bin; Jiang, Shuang; Zhang, Guanghui; Hai, Li; Wang, Jingchao; Shao, Xiao
• Is Part Of: RSC advances. Volume 8:Issue 74(2018)
• Page Start: 42262
• Page End: 42268
• Publication Date: 2018-12-19
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c8ra08016j
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : To probe the influence of phosphine ligand substitution on the well-known [2Fe2S] model, two new [FeFe]-hydrogenase model complexes with the phosphine ligands, PMe3 or P(CH3 O)3, were synthesized. Abstract : To probe the influence of phosphine ligand substitution on the well-known [2Fe2S] model, two new [FeFe]-hydrogenase model complexes with the phosphine ligands, PMe3 or P(CH3 O)3, were synthesized, such as μ-(SCH(CH2 CH3 )CH2 S)–Fe2 (CO)5 PMe3 1, and μ-(SCH(CH2 CH3 )CH2 S)–Fe2 (CO)5 P(CH3 O)3 2 Confirmation of structures was provided by FTIR, 1 H NMR, 13 C NMR, 31 P NMR, elemental analyses and single-crystal X-ray analysis. The crystal structure of complex2 shows that the P(CH3 O)3 ligand has less steric effect on the coordination geometry of the Fe atom than the PMe3 ligand. In the presence of HOAc in CH3 CN solution, the hydrogen evolution overpotentials of complexes1 and2 were 0.91 V and 0.81 V, respectively. Comparatively, complex2 produces hydrogen at an overpotential of 0.1 V, lower than that for complex1 . A further electrocatalytic study showed the maximum charges for1 and2 were 31.3 mC and 56.3 mC at −2.30 V for 10 min, respectively. These studies showed that the complexes1 and2 have the ability, as novel electrocatalysts, for catalysis of hydrogen production, and complex2 has better electrocatalytic ability than complex1 .