A Series of Novel Pentagonal-Bipyramidal Erbium(III) Complexes with Acyclic Chelating <i>N<sub>3</sub>O<sub>2</sub></i> Schiff-Base Ligands: Synthesis, Structure, and Magnetism
Tamara A. Bazhenova,
Vyacheslav A. Kopotkov,
Denis V. Korchagin,
Yuriy V. Manakin,
Leokadiya V. Zorina,
Sergey V. Simonov,
Ilya A. Yakushev,
Vladimir S. Mironov,
Alexander N. Vasiliev,
Olga V. Maximova,
Eduard B. Yagubskii
Affiliations
Tamara A. Bazhenova
Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia
Vyacheslav A. Kopotkov
Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia
Denis V. Korchagin
Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia
Yuriy V. Manakin
Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia
Leokadiya V. Zorina
Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia
Sergey V. Simonov
Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia
Ilya A. Yakushev
Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia
Vladimir S. Mironov
Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia
Alexander N. Vasiliev
Laboratory of Quantum Functional Materials, National University of Science and Technology “MISiS”, Moscow 119049, Russia
Olga V. Maximova
Lomonosov Moscow State University, Moscow 119991, Russia
Eduard B. Yagubskii
Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia
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.