CHASTANET, Guillaume; HALCROW, Malcolm Andrew

doi:10.1016/j.poly.2017.01.029

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CHASTANET, Guillaume
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

HALCROW, Malcolm Andrew
School of Chemistry [Leeds]

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Polyhedron. 2017, vol. 136, p. 5-12

Elsevier

Résumé en anglais

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.< Réduire

Mots clés en anglais

Iron

Cobalt

N-donor ligand

Spin-crossover

Magnetic measurements

iron

cobalt

spin-crossover

magnetic measurements

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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

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