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

被引：8

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.

引用

页数：22

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