title: A Stable Pentagonal Bipyramidal Dy(III) Single-Ion Magnet with a Record Magnetization Reversal Barrier over 1000 K.
abstract: Single-molecule magnets (SMMs) with a large spin reversal barrier have been recognized to exhibit slow magnetic relaxation that can lead to a magnetic hysteresis loop. Synthesis of highly stable SMMs with both large energy barriers and significantly slow relaxation times is challenging. Here, we report two highly stable and neutral Dy(III) classical coordination compounds with pentagonal bipyramidal local geometry that exhibit SMM behavior. Weak intermolecular interactions in the undiluted single crystals are first observed for mononuclear lanthanide SMMs by micro-SQUID measurements. The investigation of magnetic relaxation reveals the thermally activated quantum tunneling of magnetization through the third excited Kramers doublet, owing to the increased axial magnetic anisotropy and weaker transverse magnetic anisotropy. As a result, pronounced magnetic hysteresis loops up to 14 K are observed, and the effective energy barrier (Ueff = 1025 K) for relaxation of magnetization reached a breakthrough among the SMMs.
authors.affiliation: Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, P. R. China.
authors.forename: Jiang
authors.initials: J
authors.lastname: Liu
authors.affiliation: Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, P. R. China.
authors.forename: Yan-Cong
authors.initials: YC
authors.lastname: Chen
authors.affiliation: Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, P. R. China.
authors.forename: Jun-Liang
authors.initials: JL
authors.lastname: Liu
authors.affiliation: Theory of Nanomaterials Group and INPAC - Institute of Nanoscale Physics and Chemistry, Katholieke Universiteit Leuven , Celestijnenlaan 200F, 3001 Leuven, Belgium.
authors.forename: Veacheslav
authors.initials: V
authors.lastname: Vieru
authors.affiliation: Theory of Nanomaterials Group and INPAC - Institute of Nanoscale Physics and Chemistry, Katholieke Universiteit Leuven , Celestijnenlaan 200F, 3001 Leuven, Belgium.|Theoretical Chemistry, Lund University , Getingevagen 60, 22241, Lund, Sweden.
authors.forename: Liviu
authors.initials: L
authors.lastname: Ungur
authors.affiliation: Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, P. R. China.
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Jia
authors.affiliation: Theory of Nanomaterials Group and INPAC - Institute of Nanoscale Physics and Chemistry, Katholieke Universiteit Leuven , Celestijnenlaan 200F, 3001 Leuven, Belgium.
authors.forename: Liviu F
authors.initials: LF
authors.lastname: Chibotaru
authors.affiliation: Institut Néel, CNRS & Université Grenoble Alpes , BP 166, 25 avenue des Martyrs, 38042 Grenoble Cedex 9, France.
authors.forename: Yanhua
authors.initials: Y
authors.lastname: Lan
authors.affiliation: Institut Néel, CNRS & Université Grenoble Alpes , BP 166, 25 avenue des Martyrs, 38042 Grenoble Cedex 9, France.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Wernsdorfer
authors.affiliation: Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, P. R. China.
authors.forename: Song
authors.initials: S
authors.lastname: Gao
authors.affiliation: Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, P. R. China.
authors.forename: Xiao-Ming
authors.initials: XM
authors.lastname: Chen
authors.affiliation: Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, P. R. China.
authors.forename: Ming-Liang
authors.initials: ML
authors.lastname: Tong