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Issue 30, 2013
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Irreversible thermochromism in copper chloride Imidazolium Nanoparticle Networks

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Abstract

In this work Imidazolium Nanoparticle Networks (INNs) with chloride counter-ions were used to complex copper dichloride. This complexation reaction leads to the formation of a green material. The properties of the copper INN material were compared to: first, copper imidazolium complexes, without the presence of silica nanoparticles, which are not thermochromic; second, chloride-containing INN material. The copper INN material showed irreversible thermochromic behaviour, with a clear colour change from green to yellow at 180 °C, which is due to a configuration change of the copper complex from planar to tetragonal. This structural change was studied using DSC and in situ SAXS measurements during heat treatment. The thermochromic material is stable under air up to 250 °C. This preliminary study opens the door of optical sensors for INN materials.

Graphical abstract: Irreversible thermochromism in copper chloride Imidazolium Nanoparticle Networks

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Publication details

The article was received on 30 Jan 2013, accepted on 22 May 2013 and first published on 23 May 2013


Article type: Paper
DOI: 10.1039/C3CP50430A
Citation: Phys. Chem. Chem. Phys., 2013,15, 12717-12723
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    Irreversible thermochromism in copper chloride Imidazolium Nanoparticle Networks

    M. Kronstein, K. Kriechbaum, J. Akbarzadeh, H. Peterlik and M. Neouze, Phys. Chem. Chem. Phys., 2013, 15, 12717
    DOI: 10.1039/C3CP50430A

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