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Open AccessFeature PaperArticle

Spin Cross-Over (SCO) Anionic Fe(II) Complexes Based on the Tripodal Ligand Tris(2-pyridyl)ethoxymethane

1
Univ Brest, CNRS, CEMCA, 6 Avenue Le Gorgeu, C.S, 93837–29238 Brest CEDEX 3, France
2
Instituto de Ciencia Molecular (ICMol), Departamento de Química Inorgánica, Universidad de Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Spain
3
Laboratoire de Cristallographie, Résonance Magnétique et Modélisations, UMR 7036, Boulevard des Aiguillettes, BP239 54506 Vandoeuvre-les-Nancy, France
*
Author to whom correspondence should be addressed.
Magnetochemistry 2020, 6(2), 26; https://doi.org/10.3390/magnetochemistry6020026
Received: 23 May 2020 / Revised: 4 June 2020 / Accepted: 5 June 2020 / Published: 7 June 2020
(This article belongs to the Special Issue Feature Papers in Magnetochemistry)
Reactions of Fe(II) with the tripodal chelating ligand 1,1,1-tris(2-pyridyl)ethoxymethane (py3C-OEt) and (NCE) co-ligands (E = S, Se, BH3) give a series of mononuclear complexes formulated as [Fe(py3C-OEt)2][Fe(py3C-OEt)(NCE)3]2·2CH3CN, with E = S (1) and BH3 (2). These compounds are the first Fe(II) spin cross-over (SCO) complexes based on the tripodal ligand tris(2-pyridyl)ethoxymethane and on the versatile co-ligands (NCS) and (NCBH3). The crystal structure reveals discrete monomeric isomorph structures formed by a cationic [Fe(py3C-OEt)2]2+ complex and by two equivalent anionic [Fe(py3C-OEt)(NCE)3] complexes. In the cations the Fe(II) is facially coordinated by two py3C-OEt tripodal ligands whereas in the anion the three nitrogen atoms of the tripodal ligand are facially coordinated and the N-donor atoms of the three (NCE) co-ligands occupy the remaining three positions to complete the distorted octahedral environment of the Fe(II) centre. The magnetic studies show the presence of gradual SCO for both complexes: A one-step transition around 205 K for 1 and a two-step transition for compound 2, centered around 245 K and 380 K. View Full-Text
Keywords: tripodal ligands; iron complex; spin cross-over; infrared spectroscopy; magnetic properties tripodal ligands; iron complex; spin cross-over; infrared spectroscopy; magnetic properties
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MDPI and ACS Style

Cuza, E.; Benmansour, S.; Cosquer, N.; Conan, F.; Pillet, S.; Gómez-García, C.J.; Triki, S. Spin Cross-Over (SCO) Anionic Fe(II) Complexes Based on the Tripodal Ligand Tris(2-pyridyl)ethoxymethane. Magnetochemistry 2020, 6, 26.

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