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Article Dans Une Revue Chemical Science Année : 2023

Bidirectional photoswitchability in an iron(iii) spin crossover complex: symmetry-breaking and solvent effects

Raúl Díaz-Torres
Eric Collet
Elzbieta Trzop
Phimphaka Harding
David J Harding

Résumé

The impact of solvent on spin crossover (SCO) behaviour is reported in two solvates [Fe(qsal-I) 2 ]NO 3 $2ROH (qsal-I = 4-iodo-2-[(8-quinolylimino)methyl]phenolate; R = Me 1 or Et 2) which undergo abrupt and gradual SCO, respectively. A symmetry-breaking phase transition due to spin-state ordering from a [HS] to [HS-LS] state occurs at 210 K in 1, while T 1/2 = 250 K for the EtOH solvate, where complete SCO occurs. The MeOH solvate exhibits LIESST and reverse-LIESST from the [HS-LS] state, revealing a hidden [LS] state. Moreover, photocrystallographic studies on 1 at 10 K reveal re-entrant photoinduced phase transitions to a high symmetry [HS] phase when irradiated at 980 nm or a high symmetry [LS] phase after irradiation at 660 nm. This study represents the first example of bidirectional photoswitchability and subsequent symmetry-breaking from a [HS-LS] state in an iron(III) SCO material.
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Origine : Publication financée par une institution

Dates et versions

hal-04163512 , version 1 (17-07-2023)

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Raúl Díaz-Torres, Guillaume Chastanet, Eric Collet, Elzbieta Trzop, Phimphaka Harding, et al.. Bidirectional photoswitchability in an iron(iii) spin crossover complex: symmetry-breaking and solvent effects. Chemical Science, 2023, 14 (26), pp.7185-7191. ⟨10.1039/d3sc01495a⟩. ⟨hal-04163512⟩
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