The results. Sample Availability: Samples of the compounds are certainly not offered in the authors.
moleculesArticleA Series of Novel Pentagonal-Bipyramidal Erbium(III) Complexes with Acyclic Chelating N3O2 Schiff-Base Ligands: Synthesis, Structure, and MagnetismTamara A. Bazhenova 1 , Vyacheslav A. Kopotkov 1, , Denis V. Korchagin 1 , Yuriy V. Manakin 1 , Leokadiya V. Zorina 1,two , Sergey V. Simonov 1,two , Ilya A. Yakushev 1,three , Vladimir S. Mironov 1,4 , Alexander N. Vasiliev five,six , Olga V. Maximova 6 and Eduard B. Yagubskii2 3Citation: Bazhenova, T.A.; Kopotkov, V.A.; Korchagin, D.V.; Manakin, Y.V.; Zorina, L.V.; Simonov, S.V.; Yakushev, I.A.; Mironov, V.S.; Vasiliev, A.N.; Maximova, O.V.; et al. A Series of Novel Pentagonal-Bipyramidal Erbium(III) Complexes with Acyclic Chelating N3 O2 Schiff-Base Ligands: Synthesis, Structure, and Magnetism. Molecules 2021, 26, 6908. https:// doi.org/10.3390/molecules26226908 Academic Editor: Jozef Stre ka c Received: 17 October 2021 Accepted: 13 November 2021 Published: 16 NovemberInstitute of Difficulties of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia; [email protected] (T.A.B.); [email protected] (D.V.K.); [email protected] (Y.V.M.); [email protected] (L.V.Z.); [email protected] (S.V.S.); [email protected] (I.A.Y.); [email protected] (V.S.M.); [email protected] (E.B.Y.) Institute of Solid State Physics, ISSP RAS, Chernogolovka 142432, Russia Kurnakov Institute of General and Inorganic Chemistry, IGIC RAS, Moscow 119333, Russia Shubnikov Institute of Crystallography of Federal Scientific Study Centre “Crystallography and Photonics” RAS, Moscow 119333, Russia Laboratory of Quantum Functional Components, National University of Science and Technology “MISiS”, Moscow 119049, Russia; [email protected] Lomonosov Moscow State University, Moscow 119991, Russia; [email protected] Correspondence: [email protected]: A series of six seven-coordinate pentagonal-bipyramidal (PBP) erbium complexes, with acyclic pentadentate [N3 O2 ] Schiff-base ligands, two,6-diacetylpyridine bis-(4-methoxy benzoylhydrazone) [H2 DAPMBH], or 2,6-diacethylpyridine bis(salicylhydrazone) [H4 DAPS], and several apical ligands in distinctive charge states have been synthesized: [Er(DAPMBH)(C2 H5 OH)Cl] (1); [Er(DAPMBH) (H2 O)Cl]C2 H5 OH (two); [Er(DAPMBH)(CH3 OH)Cl] (three); [Er(DAPMBH)(CH3 OH)(N3 )] (four); [(Et3 H)N] [Er (H2 DAPS)Cl2 ]- (five); and [(Et3 H)N] [Y0 .95 Er0 .05 (H2 DAPS)Cl2 ]- (6). The physicochemical properties, crystal structures, plus the DC and AC magnetic properties of 1 were studied. The AC magnetic measurements revealed that most of Compounds 1 are field-induced single-molecule magnets, with estimated magnetization energy barriers, Ueff 168 K. The experimental study in the magnetic properties was complemented by theoretical evaluation determined by ab initio and crystal field calculations. An experimental and theoretical study from the IL-4 Protein manufacturer magnetism of 1 shows the subtle impact in the form and charge state on the axial ligands on the SMM properties of these complexes. Keywords: field-induced single-molecular magnets; seven-coordinate complexes; Er(III) complexes; ligands H2 MRTX-1719 Autophagy DAPMBH and H4 DAPS; crystal structure; DC and AC magnetic propertiesPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.1. Introduction Currently, it has turn into clear that magnetic anisotropy may be the most critical issue for the improvement of high-performance single-molecule magnets (SMMs) [1]. An e.