Reusable surface confined semi-conducting metal-TCNQ and metal-TCNQF 4 catalysts for electron transfer reactions

Mahajan, M, Bhargava, S and O'Mullane, A 2013, 'Reusable surface confined semi-conducting metal-TCNQ and metal-TCNQF 4 catalysts for electron transfer reactions', RSC Advances, vol. 3, no. 13, pp. 4440-4446.


Document type: Journal Article
Collection: Journal Articles

Title Reusable surface confined semi-conducting metal-TCNQ and metal-TCNQF 4 catalysts for electron transfer reactions
Author(s) Mahajan, M
Bhargava, S
O'Mullane, A
Year 2013
Journal name RSC Advances
Volume number 3
Issue number 13
Start page 4440
End page 4446
Total pages 7
Publisher RSC Publications
Abstract The synthesis of organic semiconducting materials based on silver and copper-TCNQ (TCNQ = 7,7,8,8- tetracyanoquinodimethane) and their fluorinated analogues has received a significant amount of attention due to their potential use in organic electronic applications. However, there is a scarcity in the identification of different applications for which these interesting materials may be suitable candidates. In this work, we address this by investigating the catalytic properties of such materials for the electron transfer reaction between ferricyanide and thiosulphate ions in aqueous solution, which to date has been almost solely limited to metallic nanomaterials. Significantly it was found that all the materials investigated, namely CuTCNQ, AgTCNQ, CuTCNQF4 and AgTCNQF4, were catalytically active and, interestingly, the fluorinated analogues were superior. AgTCNQF4 demonstrated the highest activity and was tested for its stability and re-usability for up to 50 cycles without degradation in performance. The catalytic reaction was monitored via UV-vis spectroscopy and open circuit potential versus time measurements, as well as an investigation of the transport properties of the films via electrochemical impedance spectroscopy. It is suggested that morphology and bulk conductivity are not the limiting factors, but rather the balance between the accumulated surface charge from electron injection via thiosulphate ions on the catalyst surface and transfer to the ferricyanide ions which controls the reaction rate. The facile fabrication of re-usable surface confined organic materials that are catalytically active may have important uses for many more electron transfer reactions.
Subject Physical Chemistry not elsewhere classified
DOI - identifier 10.1039/c3ra22936j
Copyright notice This journal is © The Royal Society of Chemistry 2013
ISSN 2046-2069
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