BALDÉ, Cherif; PARADIS, Nicolas; DESPLANCHES, Cédric; CHASTANET, Guillaume

doi:10.1002/ejic.201800053

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BALDÉ, Cherif
Laboratoire de Chimie et Physique [LCPM]

PARADIS, Nicolas
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

DESPLANCHES, Cédric
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Article de revue

Ce document a été publié dans

European Journal of Inorganic Chemistry. 2018, vol. 2018, n° 19, p. 2004-2010

Wiley-VCH Verlag

Résumé en anglais

A series of photoswitchable precursors based on [Fe(NCX)2L(L′)2], where X = S or Se, L is a bidentate ligand (phenanthroline or bipyrimidine), and L′ a monodentate ligand such as a pyridine or picoline derivative, were synthesized and their spin crossover (SCO) properties investigated in detail. The thermal and light‐induced magnetic properties of a family of [Fe(NCS)2L(py)2] [py = pyridine and L = bipyrimidine (1) or phenanthroline (phen) (2)] is reported. The [Fe(NCX)2(phen)(L′)2] compounds were further explored by changing the counteranion from NCS– to NCSe– (3) or by replacing pyridine with 4‐picoline (4) or 4‐ethylpyridine (5). Complexes 1–4 exhibit thermal and light‐induced SCO, while 5 remains in the high‐spin state. The kinetics governing the photoinduced back‐conversion was investigated for compounds 2 and 4. Complex 2 exhibits LIESST relaxation kinetics involving strongly cooperative (sigmoidal) behavior, whereas complex 4 displays a stretched exponential shape, typical for broad distributions of relaxation times. These results are discussed on the basis of the steric hindrance due to bulkiness and the electronic influence of the substituent effects on the magnetic and photomagnetic properties of mononuclear iron(II) complexes.< Réduire

Mots clés en anglais

Spin crossover

N ligands

Iron

Ligand effects

Magnetic properties

DOI

http://dx.doi.org/10.1002/ejic.201800053

Project ANR

Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003
Etude femtoseconde rayons X et optique de la dynamique ultrarapide de photocommutation de matériaux moléculaires magnétiques - ANR-13-BS04-0002

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Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026