A Series of Field-Induced Single-Ion Magnets Based on the Seven-Coordinate Co(II) Complexes with the Pentadentate (N3O2) H2dapsc Ligand

descriptionPublicationkeyboard_double_arrow_right Article 18 Oct 2019 English Publisher:MDPI AGJournal:Magnetochemistry, volume 5, page 58 (eissn: 2312-7481,

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Authors: Vyacheslav A. Kopotkov; Denis V. Korchagin; Valentina D. Sasnovskaya; Ildar F. Gilmutdinov; Eduard B. Yagubskii;

doi: 10.3390/magnetochemistry5040058 , 10.5281/zenodo.3445381 , 10.5281/zenodo.3445380 , 10.5281/zenodo.3475419

A Series of Field-Induced Single-Ion Magnets Based on the Seven-Coordinate Co(II) Complexes with the Pentadentate (N3O2) H2dapsc Ligand

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Abstract

A series of five new mononuclear pentagonal bipyramidal Co(II) complexes with the equatorial 2,6-diacetylpyridine bis(semicarbazone) ligand (H2dapsc) and various axial pseudohalide ligands (SCN, SeCN, N(CN)2, C(CN)3, and N3) was prepared and structurally characterizated: [Co(H2dapsc)(SCN)2]∙0.5C2H5OH (1), [Co(H2dapsc)(SeCN)2]∙0.5C2H5OH (2), [Co(H2dapsc)(N(CN)2)2]∙2H2O (3), [Co(H2dapsc)(C(CN)3)(H2O)](NO3)∙1.16H2O (4), and {[Co(H2dapsc)(H2O)(N3)][Co(H2dapsc)(N3)2]}N3∙4H2O (5). The combined analyses of the experimental DC and AC magnetic data of the complexes (1–5) and two other earlier described those of this family [Co(H2dapsc)(H2O)2)](NO3)2∙2H2O (6) and [Co(H2dapsc)(Cl)(H2O)]Cl∙2H2O (7), their theoretical description and the ab initio CASSCF/NEVPT2 calculations reveal large easy-plane magnetic anisotropies for all complexes (D = + 35 − 40 cm−1). All complexes under consideration demonstrate slow magnetic relaxation with dominant Raman and direct spin–phonon processes at static magnetic field and so they belong to the class of field-induced single-ion magnets (SIMs).

Related Organizations

Institute of Physics
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Russian Academy of Sciences
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Keywords

crystal structure, DC and AC magnetic properties, ligand H<sub>2</sub>dapsc, co(ii) complexes, ligand h<sub>2</sub>dapsc, Chemistry, Co(II) complexes, dc and ac magnetic properties, single ion magnets; seven-coordinate complexes; Co(II) complexes; ligand H2dapsc; crystal structure; DС and AC magnetic properties, single ion magnets, seven-coordinate complexes, QD1-999

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