The influence of intermolecular coupling on electron and ion transport in differently substituted phthalocyanine thin films as electrochromic materials: a chemistry application of the Goldilocks principle

Physical Chemistry Chemical Physics : PCCP
Thi Hai Quyen NguyenDerck Schlettwein

Abstract

The transport of both electrons and ions in organic mixed ionic and electronic conductors such as phthalocyanines, is essential to allow redox reactions of entire films and, hence, to impart electrochromism. Thin films of a new type, tetrakis-perfluoroisopropyl-perfluoro phthalocyanine, F40PcCu of different thicknesses were obtained via vapor deposition. The extent of the intermolecular coupling within the F40PcCu films established by van der Waals interactions was investigated by in situ optical spectroscopy during film growth. The transfer of electrons and diffusion of counter cations in these films, as well as their electrochromic performance were characterized by electrochemical and spectroelectrochemical measurements with an aqueous solution of KCl as electrolyte. A moderate degree of intermolecular interaction of the F40PcCu molecules in the solid state was observed, compared to non-fluoroalkylated perfluoro phthalocyanine, F16PcCu and octakis-perfluoroisopropyl-perfluorophthalocyanine, F64PcCu, which exhibit stronger and weaker coupling, respectively. The replacement of F by perfluoroisopropyl is, thereby, established as a valuable approach to tune this coupling of chromophores and, hence, the transport coefficients of e...Continue Reading

References

Oct 10, 2006·Journal of Nanoscience and Nanotechnology·M TagliazucchiE J Calvo
Nov 23, 2006·Journal of the American Chemical Society·Dimas G de OteyzaHelmut Dosch
Mar 28, 2008·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Christian G ClaessensTomás Torres
Dec 1, 2017·Chemical Society Reviews·Chengliang WangWenping Hu
Jan 9, 2019·Advanced Materials·Magnus BerggrenIgor Zozoulenko

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Citations

Nov 13, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Dmitri V KonarevRimma N Lyubovskaya

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Methods Mentioned

BETA
column chromatography
quartz crystal microbalance
scanning electron microscopy
atomic force microscopy
X-ray
AFM

Software Mentioned

Gwyddion

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