Issue 41, 2019

Abrupt spin crossover in iron(iii) complexes with aromatic anions

Abstract

Two iron(III) spin crossover complexes, [Fe(qsal-X)2]OTs·nH2O, (Br 1·H2O; I, 2·2H2O or non-solvated 1, 2) have been prepared and fully characterized. Structural studies of 1·H2O and 2·2H2O reveal the presence of 1D π–π chains linking the Fe(III) centres and a strong X⋯O halogen bond. In both complexes the 1D π–π chains are angled relative to each other, enforced by C–H⋯X interactions. Magnetic studies reveal abrupt spin crossover in 1 (T1/2↓ = 258 K and T1/2↑ = 260 K) and 2 (T1/2 = 298 K) with T1/2 increasing on going from Br to I. The presence of abrupt spin crossover in both complexes shows that aromatic anions can be effective in the design of cooperative spin crossover systems.

Graphical abstract: Abrupt spin crossover in iron(iii) complexes with aromatic anions

Supplementary files

Article information

Article type
Paper
Submitted
05 юни 2019
Accepted
09 юли 2019
First published
09 юли 2019

Dalton Trans., 2019,48, 15515-15520

Abrupt spin crossover in iron(III) complexes with aromatic anions

S. E. Lazaro, A. Alkaş, S. J. Lee, S. G. Telfer, K. S. Murray, W. Phonsri, P. Harding and D. J. Harding, Dalton Trans., 2019, 48, 15515 DOI: 10.1039/C9DT02373A

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