Spin-crossover and the LIESST effect in [FexCo1‒ x(bpp)2 ][BF4 ] 2 (1.00 ≤ x ≤ 0.77). Comparison with bifunctional solid solutions of iron and cobalt spin-crossover centers - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Polyhedron Année : 2017

Spin-crossover and the LIESST effect in [FexCo1‒ x(bpp)2 ][BF4 ] 2 (1.00 ≤ x ≤ 0.77). Comparison with bifunctional solid solutions of iron and cobalt spin-crossover centers

Résumé

Co-crystallization of [Fe(bpp)2][BF4]2 and [Co(bpp)2][BF4]2 (bpp = 2,6-di{pyrazol-1-yl}pyridine) from nitromethane-diethyl ether yields homogeneous polycrystalline materials analyzing as [FexCo1‒x(bpp)2][BF4]2 (1.00 ≤ x ≤ 0.77). Thermal spin-crossover in these materials only involves the iron centers, and increasing the cobalt dopant concentration leads to a reduction in T½ and a loss of cooperativity. The materials exhibit the LIESST effect, with all three samples presenting the same T(LIESST) value. LIESST relaxation kinetics have a clear multistep character, which has not been detected before in samples derived from [Fe(bpp)2][BF4]2. Magnetic susceptibility and low-temperature crystallographic data are also presented for the pure precursor complex [Co(bpp)2][BF4]2.
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hal-01646283 , version 1 (02-03-2021)

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Guillaume Chastanet, Malcolm Andrew Halcrow. Spin-crossover and the LIESST effect in [FexCo1‒ x(bpp)2 ][BF4 ] 2 (1.00 ≤ x ≤ 0.77). Comparison with bifunctional solid solutions of iron and cobalt spin-crossover centers. Polyhedron, 2017, 136, pp.5-12. ⟨10.1016/j.poly.2017.01.029⟩. ⟨hal-01646283⟩
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