1. Cysteine residue-bridged dinuclear Ni–Fe complexes related to [NiFe]-H2ases.
- Author
-
Song, Li-Cheng, Zhang, Zhen-Qing, Gu, Zhen-Chao, and Jiang, Kai-Yu
- Subjects
CYSTEINE ,OVERPOTENTIAL ,DIPHOSPHINE ,MOIETIES (Chemistry) ,X-rays ,CATALYSTS - Abstract
To develop the biomimetic chemistry of [NiFe]-H
2 ases, we have synthesized cysteine residue-containing [NiFe]-H2 ase mimics (diphosphine)Ni[SCH2 CH(CO2 Me)NHCOC5 H4 -η5 ]2 Fe (1, diphosphine = Ph2 P(CH2 )2 PPh2 ; 2, Ph2 PCH＝CHPPh2 ; 3, 1,2-(Ph2 P)2 C6 H4 ; 4, (Ph2 P)2 NCH2 C6 H4 Me-p; 5, (Ph2 P)2 NCH2 CO2 Et; and 6, (Ph2 P)2 N-2-CH2 C5 H4 N) for the first time by a simple and convenient method. The full spectroscopic characterization of 1–6 along with X-ray crystallographic characterization of 1, 2 and 4 has proved that complexes 1–6 consist of two cysteine residue moieties that are bridged to their diphosphine-chelated Ni(II) centers and two η5 -cyclopentadienyl-coordinated Fe(II) centers. On the basis of electrochemical and electrocatalytic studies, complexes 1 and 4 have been found to be catalysts for H2 production from HOAc with moderate icat /ip and overpotential values under CV conditions. In addition, a possible 2E2C (E = electrochemical, C = chemical) mechanism is briefly suggested for this type of H2 evolution reaction (HER). [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF