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Ferrocenyl-phosphonium ionic liquids - synthesis, characterisation and electrochemistry
Paul Kübler1, Jörg Sundermeyer
1Philipps-Universität Marburg, Fachbereich Chemie und Zentrum für Materialwissenschaften, Hans-Meerwein-Straße, 35043 Marburg, Germany. jsu@staff.uni-marburg.de.
Dalton Transactions (Cambridge, England : 2003)
|January 21, 2014
Summary
Researchers synthesized novel ferrocenyl-phosphonium ionic liquids (ILs) with tunable properties. These compounds show potential as redox mediators in electrochemical devices like dye-sensitized solar cells and redox flow batteries.
Area of Science:
- Organometallic Chemistry
- Materials Science
- Electrochemistry
Background:
- Ionic liquids (ILs) are versatile materials with tunable properties.
- Ferrocene-based compounds offer unique electrochemical characteristics.
- Developing new ILs with specific functionalities is crucial for advanced applications.
Purpose of the Study:
- To synthesize novel unsymmetrically substituted ferrocenyl-phosphonium ionic liquids.
- To investigate the influence of phosphine substituents on IL properties.
- To explore their potential as redox mediators in electrochemical devices.
Main Methods:
- Synthesis of alkyl phosphines via Friedel-Crafts phosphorylation of ferrocene.
- Preparation of ferrocenyl-phosphonium ionic liquids using a two or three-step synthesis.
- Characterization of thermal stability, electrochemical potential, chemical shift, and UV-Vis absorption.
Main Results:
- Successful synthesis of new unsymmetrically substituted ferrocenyl-phosphonium ionic liquids.
- Demonstrated Friedel-Crafts phosphorylation as an efficient alternative synthesis route.
- Established the impact of P-substituents on the electronic and photophysical properties of the ILs.
Conclusions:
- The synthesized ferrocenyl-phosphonium ionic liquids possess tunable redox properties.
- These ILs are promising candidates for redox mediators in dye-sensitized solar cells and redox flow batteries.
- The phosphonium group's dual role as an ionic tag and electron-withdrawing substituent is confirmed.
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