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Issue 41, 2019
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Abrupt spin crossover in iron(iii) complexes with aromatic anions

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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

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The article was received on 05 Jun 2019, accepted on 09 Jul 2019 and first published on 09 Jul 2019

Article type: Paper
DOI: 10.1039/C9DT02373A
Dalton Trans., 2019,48, 15515-15520

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    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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