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

被引：10
作者：
Bazhenova, Tamara A. [1 ]
Kopotkov, Vyacheslav A. [1 ]
Korchagin, Denis V. [1 ]
Manakin, Yuriy V. [1 ]
Zorina, Leokadiya V. [1 ,2 ]
Simonov, Sergey V. [1 ,2 ]
Yakushev, Ilya A. [1 ,3 ]
Mironov, Vladimir S. [1 ,4 ]
Vasiliev, Alexander N. [5 ,6 ]
Maximova, Olga V. [6 ]
Yagubskii, Eduard B. [1 ]
机构：
[1] IPCP RAS, Inst Problems Chem Phys, Chernogolovka 142432, Russia
[2] ISSP RAS, Inst Solid State Phys, Chernogolovka 142432, Russia
[3] IGIC RAS, Kurnakov Inst Gen & Inorgan Chem, Moscow 119333, Russia
[4] Shubnikov Inst Crystallog Fed Sci Res Ctr Crystal, Moscow 119333, Russia
[5] Natl Univ Sci & Technol MISiS, Lab Quantum Funct Mat, Moscow 119049, Russia
[6] Lomonosov Moscow State Univ, Moscow 119991, Russia
来源：
MOLECULES | 2021年 / 26卷 / 22期
基金：
俄罗斯科学基金会;
关键词：
field-induced single-molecular magnets; seven-coordinate complexes; Er(III) complexes; ligands H(2)DAPMBH and H(4)DAPS; crystal structure; DC and AC magnetic properties; SINGLE-MOLECULE MAGNETS; CRYSTAL-FIELD ANALYSIS; X-RAY-STRUCTURE; NI-II; MN-II; ELECTRONIC-STRUCTURE; SPECTRAL PROPERTIES; LN(III) COMPLEXES; ION-MAGNET; CU-II;
D O I：
10.3390/molecules26226908
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
A series of six seven-coordinate pentagonal-bipyramidal (PBP) erbium complexes, with acyclic pentadentate [N3O2] Schiff-base ligands, 2,6-diacetylpyridine bis-(4-methoxybenzoylhydrazone) [H(2)DAPMBH], or 2,6-diacethylpyridine bis(salicylhydrazone) [H(4)DAPS], and various apical ligands in different charge states were synthesized: [Er(DAPMBH)(C2H5OH)Cl] (1); [Er(DAPMBH)(H2O)Cl]center dot 2C(2)H(5)OH (2); [Er(DAPMBH)(CH3OH)Cl] (3); [Er(DAPMBH)(CH3OH)(N-3)] (4); [(Et3H)N](+)[Er(H(2)DAPS)Cl-2](-) (5); and [(Et3H)N](+)[Y-0.Er-95(0).(05)(H(2)DAPS)Cl-2](-) (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, U-eff approximate to 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.
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页数：22
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