Issue 1, 2001

Spin-transition behaviour in chains of FeII bridged by 4-substituted 1,2,4-triazoles carrying alkyl tails

Abstract

A family of polymeric 1-dimensional chains of iron(II) species showing the spin-crossover phenomenon has been synthesized using 4-n-alkyl-1,2,4-triazoles as bridging ligands. The influence of the length of the alkyl tails on the triazole ligands on characteristic features of the spin transition was studied, showing degrading of steepness with increasing length. A set of four counter ions has been used to access a wider range of transition temperatures. Large hysteresis loops are detected with small tails, mainly for the methyl and ethyl substituted products. In most cases longer tails weaken co-operativity and hysteresis gradually decreases to zero. However it is shown that with certain anions hysteresis remains, even with very long tails on the triazoles. Weakening of the co-operativity mainly arises from a diminution of the length of the polymeric chains with increasing alkyl tails on the triazole. This effect is anion dependent. A strong interaction along the polymeric chains is confirmed.

Supplementary files

Article information

Article type
Paper
Submitted
29 Aug 2000
Accepted
09 Oct 2000
First published
01 Dec 2000

New J. Chem., 2001,25, 144-150

Spin-transition behaviour in chains of FeII bridged by 4-substituted 1,2,4-triazoles carrying alkyl tails

O. Roubeau, J. M. Alcazar Gomez, E. Balskus, J. J. A. Kolnaar, J. G. Haasnoot and J. Reedijk, New J. Chem., 2001, 25, 144 DOI: 10.1039/B007094G

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