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Updated: May 9, 2026

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)

Published on: November 22, 2016

Unexpected interaction between PEDOT and phosphonium ionic liquids.

Vanessa Armel¹, Jonathan Rivnay, George Malliaras

¹Department of Materials Engineering, Monash University, Clayton, VIC 3800, Australia.

Journal of the American Chemical Society

|July 10, 2013

Summary

This summary is machine-generated.

Ionic liquids surprisingly disrupt poly(3,4-ethylenedioxythiophene) (PEDOT) structure, causing significant film expansion without increased resistance. This expansion enhances capacitance by 350% due to ionic liquid incorporation.

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

Area of Science:

Materials Science
Electrochemistry
Polymer Science

Background:

Poly(3,4-ethylenedioxythiophene) (PEDOT) is known for its ordered structure, stable under various conditions.
Unexpected interactions between certain ionic liquids (ILs) and PEDOT can disrupt this inherent order.

Purpose of the Study:

To investigate the structural expansion of PEDOT and PEDOT(PTS):PEG films in the presence of specific ionic liquid mixtures.
To understand the impact of this expansion on electrical resistance, optical properties, and capacitance.

Main Methods:

In-situ polymerization of PEDOT and PEDOT(PTS):PEG films.
Exposure of films to ionic liquid mixtures containing triisobutylmethylphosphonium tosylate (P1444PTS) and water.
Characterization of interlayer distance (d100), electrical resistance, optical absorption, and capacitance.

Main Results:

PEDOT(PTS):PEG films expanded up to ~100%, and PEDOT(PTS) films expanded ~50% in the presence of IL mixtures.
Film expansion did not lead to increased electrical resistance.
Increased absorption in the π-π* range was observed, attributed to IL shielding of PEDOT chains.
Incorporation of P1444PTS resulted in a 350% increase in capacitance due to enhanced double-layer capacitance.

Conclusions:

Ionic liquids, specifically P1444PTS, can induce significant structural expansion in PEDOT-based films.
This expansion improves capacitance without compromising electrical conductivity, suggesting potential applications in energy storage devices.
The study highlights a novel method for tuning the properties of conductive polymers using ionic liquid interactions.