A Series of Novel Pentagonal-Bipyramidal Erbium(III) Complexes with Acyclic Chelating N3O2 Schiff-Base Ligands: Synthesis, Structure, and Magnetism

A series of six seven-coordinate pentagonal-bipyramidal (PBP) erbium complexes, with acyclic pentadentate [N3O2] Schiff-base ligands, 2,6-diacetylpyridine bis-(4-methoxybenzoylhydrazone) [H2DAPMBH], or 2,6-diacethylpyridine bis(salicylhydrazone) [H4DAPS], and various apical ligands in different char...

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Published in:Molecules (Basel, Switzerland) Switzerland), 2021-11, Vol.26 (22), p.6908
Main Authors: Bazhenova, Tamara A., Kopotkov, Vyacheslav A., Korchagin, Denis V., Manakin, Yuriy V., Zorina, Leokadiya V., Simonov, Sergey V., Yakushev, Ilya A., Mironov, Vladimir S., Vasiliev, Alexander N., Maximova, Olga V., Yagubskii, Eduard B.
Format: Article
Language:English
Subjects:
Alcohol
Anisotropy
Chelation
Crystal structure
DC and AC magnetic properties
Er(III) complexes
Erbium
Ethanol
field-induced single-molecular magnets
Geometry
Imines
Ligands
ligands H2DAPMBH and H4DAPS
Magnetic measurement
Magnetic properties
Magnetism
Physicochemical properties
seven-coordinate complexes
Solvents
Symmetry
Theoretical analysis
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Summary:A series of six seven-coordinate pentagonal-bipyramidal (PBP) erbium complexes, with acyclic pentadentate [N3O2] Schiff-base ligands, 2,6-diacetylpyridine bis-(4-methoxybenzoylhydrazone) [H2DAPMBH], or 2,6-diacethylpyridine bis(salicylhydrazone) [H4DAPS], and various apical ligands in different charge states were synthesized: [Er(DAPMBH)(C2H5OH)Cl] (1); [Er(DAPMBH)(H2O)Cl]·2C2H5OH (2); [Er(DAPMBH)(CH3OH)Cl] (3); [Er(DAPMBH)(CH3OH)(N3)] (4); [(Et3H)N]+[Er(H2DAPS)Cl2]− (5); and [(Et3H)N]+[Y0.95Er0.05(H2DAPS)Cl2]− (6). The physicochemical properties, crystal structures, and the DC and AC magnetic properties of 1–6 were studied. The AC magnetic measurements revealed that most of Compounds 1–6 are field-induced single-molecule magnets, with estimated magnetization energy barriers, Ueff ≈ 16–28 K. The experimental study of the magnetic properties was complemented by theoretical analysis based on ab initio and crystal field calculations. An experimental and theoretical study of the magnetism of 1–6 shows the subtle impact of the type and charge state of the axial ligands on the SMM properties of these complexes.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules26226908