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Bis(pentafluoroethyl)arsinous Acid and the Bis(pentafluoroethyl)arsinite─Synthesis, Structural Characterization and
Lukas Hartmann1, Beate Neumann1, Hans-Georg Stammler1
1Centrum Für Molekulare Materialien, Fakultät Für Chemie, Universität Bielefeld, 33615 Bielefeld, Germany.
Inorganic Chemistry
|February 10, 2026
Summary
Researchers synthesized and characterized bis(pentafluoroethyl)arsinous acid and its conjugate base, bis(pentafluoroethyl)arsinite. They explored its coordination chemistry and developed a method for isolating the arsinous acid, crucial for understanding arsenic acid derivatives.
Area of Science:
- Organometallic Chemistry
- Inorganic Chemistry
- Fluorine Chemistry
Background:
- Bis(pentafluoroethyl)arsinous acid and its conjugate base, bis(pentafluoroethyl)arsinite, are novel arsenic compounds.
- Understanding the synthesis and properties of highly fluorinated organoarsenic compounds is important for materials science and coordination chemistry.
Purpose of the Study:
- To synthesize and characterize bis(pentafluoroethyl)arsinous acid and bis(pentafluoroethyl)arsinite.
- To investigate the coordination behavior of the arsinite anion with transition metals.
- To develop a reliable method for the isolation of bis(pentafluoroethyl)arsinous acid.
Main Methods:
- Controlled hydrolysis of (diethylamino)bis(pentafluoroethyl)arsane.
- Reaction of the resulting diethylammonium-arsinite salt with metal complexes ([TiCp2Cl2] and [Ni(dppp)Cl2]).
- Protonation attempts using HBr and para-toluenesulfonic acid.
- Single-crystal X-ray diffraction and quantum-chemical calculations.
Main Results:
- Synthesis and isolation of diethylammonium-arsinite salt.
- Formation of monosubstituted titanium and nickel arsinite complexes.
- Successful synthesis and isolation of bis(pentafluoroethyl)arsinous acid in 80% yield.
- Determination of molecular structures via X-ray diffraction and computational analysis.
Conclusions:
- Bis(pentafluoroethyl)arsinite can act as a ligand in organometallic complexes.
- Para-toluenesulfonic acid is an effective reagent for synthesizing bis(pentafluoroethyl)arsinous acid.
- The structural and computational data provide insights into the chemistry of fluorinated arsinous acids.
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