Diiron carbonyl complexes containing bridging 1,3-bis(diphenylphosphino)propane or monosubstituted tris(3-fluorophenyl)phosphine: synthesis, characterization, X-ray crystallography, and electrochemistry

Abstract

In this report, two diiron ethane-1,2-dithiolate carbonyl complexes with bridging 1,3-bis(diphenylphosphino)propane (dppp) or tris(3-fluorophenyl)phosphine have been synthesized and characterized. Treatment of complex [Fe₂(CO)₆(µ-SCH₂CH₂S)] (1) with a diphosphine ligand dppp or a monophosphine ligand tris(3-fluorophenyl)phosphine using Me₃NO·2H₂O as the decarbonylating reagent afforded the corresponding derivatives [{Fe₂(CO)₅(µ-SCH₂CH₂S)}₂(Ph₂PCH₂CH₂CH₂PPh₂)] (2) and [Fe₂(CO)₅(µ-SCH₂CH₂S){P(3-C₆H₄F)₃}] (3) in 82% and 92% yields, respectively. Complexes 2 and 3 have been characterized by elemental analysis, IR, NMR spectroscopy, as well as confirmed by single crystal X-ray diffraction analysis. Moreover, the electrochemistry of these complexes were studied by cyclic voltammetry.

Keywords:

• [FeFe]-hydrogenases
• diiron ethane-1,2-dithiolate
• CO substitution
• crystal structure
• electrochemistry

Disclosure statement

No potential conflict of interest was reported by the authors.

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 & Technology Department of Sichuan Province under Grant 2018JY0235, Education Department of Sichuan Province under Grant 18ZA0337, and Sichuan University of Science & Engineering under Grant S201910622022.