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Open AccessArticle

Iron(II) Spin Crossover (SCO) Materials Based on Dipyridyl-N-Alkylamine

1
Univ Brest, CNRS, CEMCA, 6 Avenue Le Gorgeu, C.S. 93837-29238 Brest CEDEX 3, France
2
Faculté des Sciences, Université Mouloud Mammeri, Tizi-Ouzou 15000, Algeria
3
Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
4
CNRS, University of Bordeaux, ICMCB, UMR 5026, 87 Av. Doc. A. Schweitzer, F-33608 Pessac, France
*
Author to whom correspondence should be addressed.
Crystals 2018, 8(11), 401; https://doi.org/10.3390/cryst8110401
Received: 1 October 2018 / Revised: 20 October 2018 / Accepted: 21 October 2018 / Published: 24 October 2018
(This article belongs to the Special Issue Synthesis and Applications of New Spin Crossover Compounds)
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. View Full-Text
Keywords: Fe(II) complex; dipyridyl-N-alkylamine ligands; high spin (HS); low spin (LS); spin cross-over (SCO); magnetic transition Fe(II) complex; dipyridyl-N-alkylamine ligands; high spin (HS); low spin (LS); spin cross-over (SCO); magnetic transition
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MDPI and ACS Style

Houari, T.; Cuza, E.; Pinkowicz, D.; Marchivie, M.; Yefsah, S.; Triki, S. Iron(II) Spin Crossover (SCO) Materials Based on Dipyridyl-N-Alkylamine. Crystals 2018, 8, 401.

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