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- Title
2D Bimetallic Oxalate-Based Ferromagnets with Inserted [Fe(4-Br-sal<sub>2</sub>-trien)]<sup>+</sup> and [Fe(3-R-sal<sub>2</sub>-trien)]<sup>+</sup> (R = Br, Cl and CH<sub>3</sub>O) Fe<sup>III</sup> Spin-Crossover Complexes.
- Authors
Clemente‐León, Miguel; Coronado, Eugenio; López‐Jordà, Maurici
- Abstract
The syntheses, structures and magnetic properties of the compounds of formula [FeIII(4-Br-sal2-trien)][MnIICrIII(ox)3]0.67Cl0.33 ·CH3OH_solvate ( 1), [FeIII(3-Br-sal2-trien)][MnIICrIII(ox)3] ·(CH3CN)2 ( 2), [FeIII(3-Cl-sal2-trien)][MnIICrIII(ox)3] ·(CH3OH)2 ·(CH3CN)2 ( 3) and [FeIII(3-CH3O-sal2-trien)][MnIICrIII(ox)3] ·(CH3OH) ·(H2O)1.5 ·(CH2Cl2)0.5 ( 4) are reported. The four structures present a 2D honeycomb anionic layer formed by MnII and CrIII ions linked through oxalate ligands and a cationic layer of the FeIII complexes intercalated between the 2D oxalate network. The main differences compared with previous 2D oxalate-based structures are the presence of double layers of cations in compounds 1, 3 and 4 and porous channels in the structures of 1 and 4 filled with disordered solvent molecules. The magnetic properties indicate that the inserted FeIII cations undergo an almost complete spin crossover above 300 K in 1 and a partial spin crossover in 3 and 4 that coexists with a ferromagnetic ordering of the oxalate network. In the case of 2, the inserted cation remains in the HS from 2 to 300 K. Therefore, 1, 3 and 4 are multifunctional compounds with coexistence of spin crossover and magnetic ordering. Conversely, photomagnetic characterization shows that 1 and 3 do not present a LIESST effect in contrast to the 2D compound [FeIII(sal2-trien)][MnIICrIII(ox)3] ·(CH2Cl2). These results could help to clarify this rare property for a FeIII complex.
- Subjects
BIMETALLISM; FERROMAGNETIC materials; IRON compounds; MAGNETIC properties; SOLVATED electrons
- Publication
European Journal of Inorganic Chemistry, 2013, Vol 2013, Issue 5/6, p753
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201201113