Four novel [2Fe2S] model complexes (1-4) had been synthesized and characterized by IR, 1H NMR, elemental analysis and single crystal X-ray crystallography (for 2). The key parameters affecting H2 evolution of title compounds (1-4) were optimized by constructing homogeneous photo-catalytic system consisting of title compounds (1-4) as catalyst, erythrosin B sodium salt (EBS2-) as photo-sensitizer (PS) and triethylamine (TEA) as sacrificial reagent in CH3CN/H2O solution under the irradiation of visible light. The maximum H2 evolution was separately 211.4 ± 6.5 μmol (52.9 ± 1.6 TON vs. 4), 199.4 ± 13.5 μmol (49.9 ± 3.4 TON vs. 1), 124.8 ± 7.6 μmol (31.2 ± 1.9 TON vs. 3) and 34.9 ± 6.9 μmol (8.7 ± 1.7 TON vs. 2) under the optimal conditions with catalyst of 2 × 10-4 mol·L-1, EBS2- of 4 × 10-4 mol·L-1, TEA of 10% (v/v) and pH 12 in CH3CN/H2O (1/1, v/v) solution. Furthermore, the structural effect and mechanism of electron transfer in the present system was carefully discussed by fluorescence spectra and cyclic voltammetry (CV) measurements.
Zheng, H. Q., Wang, X. B., Hu, J. Y., Zhao, J. A., Du, C. X., Fan, Y. T., & Hou, H. W. (2016). Photo-catalytic H2 evolution, structural effect and electron transfer mechanism based on four novel [2Fe2S] model complexes by photochemical splitting water. Solar Energy, 132, 373–385. https://doi.org/10.1016/j.solener.2016.03.010