Diiron butane-1,2-dithiolate complexes with tris(4-chlorophenyl)phosphine or tris(4-methoxyphenyl)phosphine: synthesis, characterization, X-ray crystal structures, and electrochemistry

Abstract

Two diiron butane-1,2-dithiolate complexes containing tris(4-chlorophenyl)phosphine or tris(4-methoxyphenyl)phosphine have been prepared and characterized. Treatment of complex [Fe₂(CO)₆{μ-SCH₂CH(CH₂CH₃)S}] (1) with tris(4-chlorophenyl)phosphine or tris(4-methoxyphenyl)phosphine in the presence of Me₃NO · 2 H₂O as the oxidizing agent gave the complexes [Fe₂(CO)₅{P(4-C₆H₄Cl)₃}{µ-SCH₂CH(CH₂CH₃)S)} (2) and [Fe₂(CO)₅{P(4-C₆H₄OCH₃)₃}{µ-SCH₂CH(CH₂CH₃)S)}] (3) in 92% and 90% yields, respectively. Both complexes were characterized by elemental analysis, IR, NMR spectroscopy, and their structures were confirmed by single-crystal X-ray diffraction analysis. Moreover, the electrochemical properties of complexes 2 and 3 were investigated by cyclic voltammetry.

Graphical Abstract

Keywords:

• Diiron butane-1,2-dithiolate
• [FeFe]-hydrogenase
• CO substitution
• crystal structure
• electrochemistry

Additional information

Funding

This research was supported by Zhejiang Provincial Natural Science Foundation of China under Grant LY19B020002, National Natural Science Foundation of China under Grant 21501124, Science and Technology Department of Sichuan Province under Grant 2018JY0235, Education Department of Sichuan Province under Grant 18ZA0337, and Sichuan University of Science and Engineering under Grant S201910622022.