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Post-synthetic anion exchange in iron(ii) 1,2,4-triazole based spin crossover materials via mechanochemistry

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Abstract

A facile method for post-synthetic exchange of anions in an iron(II) spin crossover material using mechanochemistry is described. Dry grinding of the [Fe(atrz)3]Cl2 complex (atrz = 4-amino-1,2,4-triazole) in the presence of an excess of sodium halide salt results in the complete exchange of anions and formation of [Fe(atrz)3]Br2 and [Fe(atrz)3]I2 in a solid-state metathesis reaction. The method represents a new strategy for tuning active switching properties such as the transition temperature in spin crossover systems. Formation of stable by-products was identified as a major driving force for exchange and a straightforward method to predict the likely outcome of such reactions using simple thermodynamic considerations is presented.

Graphical abstract: Post-synthetic anion exchange in iron(ii) 1,2,4-triazole based spin crossover materials via mechanochemistry

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Article information


Submitted
10 Dec 2019
Accepted
12 Feb 2020
First published
13 Feb 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

Post-synthetic anion exchange in iron(II) 1,2,4-triazole based spin crossover materials via mechanochemistry

J. H. Askew and H. J. Shepherd, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT04700J

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