Synthesis of iron(II) complexes with asymmetric N<sub>2</sub>O<sub>2</sub> coordinating Schiff base-like ligands and their spin crossover properties

doi:10.1007/s11705-018-1753-4

Front. Chem. Sci. Eng.

2018, Vol. 12

Issue (3) : 400-408 https://doi.org/10.1007/s11705-018-1753-4

RESEARCH ARTICLE

Synthesis of iron(II) complexes with asymmetric N₂O₂ coordinating Schiff base-like ligands and their spin crossover properties

Wolfgang Bauer, Tanja Ossiander, Birgit Weber(

)

Department of Chemistry, University of Bayreuth, 95440 Bayreuth, Germany

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Abstract

The synthesis of new Schiff base-like ligands with asymmetric substituents pattern and their iron complexes with pyridine as axial ligand is described. Two of the ligands and one of the iron(II) complexes were characterized by single crystal X-ray structure analysis. One of the the iron(II) complexes shows spin crossover behavior while the others remain in the high spin state. The influence of the reduced symmetry of the ligand on the properties of the complexes is discussed.

Keywords iron Schiff base-like ligands magnetism spin crossover X-ray structures

Corresponding Author(s): Birgit Weber

Just Accepted Date: 13 June 2018 Online First Date: 06 September 2018 Issue Date: 18 September 2018

Cite this article:

Wolfgang Bauer,Tanja Ossiander,Birgit Weber. Synthesis of iron(II) complexes with asymmetric N₂O₂ coordinating Schiff base-like ligands and their spin crossover properties[J]. Front. Chem. Sci. Eng., 2018, 12(3): 400-408.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-018-1753-4
https://academic.hep.com.cn/fcse/EN/Y2018/V12/I3/400

Fig.1 Scheme 1 General procedure for the synthesis of the asymmetric Schiff base-like ligands and their iron(II) complexes together with the used abbreviations

Tab.1 Selected bond lengths (Å) of the Ligands H₂L2a and H₂L2c and comparison with the theoretical values for the corresponding single or double bonds

Fig.2 ORTEP drawing of the ligands H₂L2a (left) and H₂L2c (right) and the numbering scheme used in the manuscript. The ellipsoids are drawn at the 50% probability level. Hydrogen atoms were omitted for clarity

Fig.3 Packing of the molecules in the crystal. Left: H₂L2a projected along [100] and right: H₂L2c projected along [100]. Hydrogen atoms have been omitted for clarity

Fig.4 ORTEP drawing of the complex [Fe(L2b)(py)₂] and the numbering scheme used in the manuscript. The ellipsoids are drawn at the 50% probability level. Hydrogen atoms are omitted for clarity

Tab.2 Selected bond lengths (Å) and angles (°) of the first coordination sphere of the iron center

Fig.5 Packing of [Fe(L2b)(py)₂] in the crystal. Top: projected along [100] and bottom: projected along [001]. Hydrogen atoms have been omitted for clarity. The dotted lines illustrate short intermolecular contacts discussed in the manuscript

Fig.6 Plot of the c_MT product vs. T in the 300-50 K range for (A) [Fe(L2b)(py)₂], (B) [Fe(L2b)(py)₂] single crystals, (C) [Fe(L2a)(py)₂] and (D) [Fe(L2d)(py)₂]

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