HOUARI, Taous; CUZA, Emmelyne; PINKOWICZ, Dawid; MARCHIVIE, Mathieu; YEFSAH, Said; TRIKI, Smail

doi:10.3390/cryst8110401

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Licence d’utilisation du document

HOUARI, Taous
Chimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]
Université Mouloud Mammeri [Tizi Ouzou] = Mouloud Mammeri University of Tizi-Ouzou [UMMTO]

CUZA, Emmelyne
Chimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]

PINKOWICZ, Dawid
Uniwersytet Jagielloński w Krakowie = Jagiellonian University [UJ]

Langue

Article de revue

Ce document a été publié dans

Crystals. 2018, vol. 8, n° 11, p. 401

MDPI

Résumé en anglais

We present here a new series of spin crossover (SCO) Fe(II) complexes based on dipyridyl-N-alkylamine and thiocyanate ligands, with the chemical formulae [Fe(dpea)2(NCS)2] (1) (dpea = 2,2’-dipyridyl-N-ethylamine), I-[Fe(dppa)2(NCS)2], (2) II-[Fe(dppa)2(NCS)2], and (2’) (dppa = 2,2’-dipyridyl-N-propylamine). The three complexes displayed nearly identical discrete molecular structures, where two chelating ligands (dpea (1) and dppa (2 and 2’)) stand in the cis-positions, and two thiocyanato-κN ligands complete the coordination sphere in the two remaining cis-positions. Magnetic studies as a function of temperature revealed the presence of a complete high-spin (HS) to low-spin (LS) transition at T1/2 = 229 K for 1, while the two polymorphs I-[Fe(dppa)2(NCS)2] (2) and II-[Fe(dppa)2(NCS)2] (2’) displayed similar magnetic behaviors with lower transition temperatures (T1/2 = 211 K for 2; 212 K for 2’). Intermolecular contacts in the three complexes indicated the absence of any significant interaction, in agreement with the gradual SCO behaviors revealed by the magnetic data. The higher transition temperature observed for complex 1 agrees well with the more pronounced linearity of the Fe–N–C angles recently evidenced by experimental and theoretical magnetostructural studies.< Réduire

Mots clés en anglais

dipyridyl-N-alkylamine ligands

Fe(II) complex

high spin (HS)

low spin (LS)

spin cross-over (SCO)

magnetic transition

DOI

http://dx.doi.org/10.3390/cryst8110401

Project ANR

Bistabilité magnétique dans de nouveaux systèmes moléculaires à base de ligands anioniques pontants - ANR-12-BS07-0030

Origine

Importé de hal

Unités de recherche

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