Two Ln4 clusters based complexes exhibiting magnetocaloric effect and magnetic dynamics behaviors. (15th May 2018)

• Record Type: Journal Article
• Authors: Wang, Wen-Min; Zhang, Ya-Xin; Zhao, Jin-Can; Zhang, Xiao-Hua; Tan, Yu; Cui, Ying-Ying; Shi, Ying; Wu, Zhi-Lei
• Is Part Of: Polyhedron. Volume 146(2018)
• Page Start: 161
• Page End: 165
• Publication Date: 2018-05-15
• Subjects: Magnetocaloric effect -- Magnetic dynamics behaviors -- Tetranuclear -- Ln-based clusters -- Energy barrier; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2018.03.002
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Two tetranuclear Ln4 compounds were successfully assembled based on Gd(III) and Dy(III) ions, and they were structurally and magnetically characterized. Structural analysis reveal that they were isomorphic and both composed of planar Ln4 clusters in them. Moreover, magnetic investigations indicate that1 ·Gd displays magnetic entropy change (−Δ S m ) of 21.55(3) J K −1 kg −1 at 2 K for Δ H = 7 T. For2 ·Dy, it exhibits slow magnetic relaxation behavior with the energy barrier (Δ E / k B ) of 27.96(7) K. Abstract: Two new tetranuclear Ln-based clusters, namely [Ln4 ( μ 3 -OH)2 L6 (beac)4 ] (Ln = Gd (1 ) and Dy (2 )), were successfully assembled by employing 5-(2-thenylidene)-8-hydroxylquinoline (HL) and 1-benzoylacetone (Hbeac). They were structurally characterized by single crystal X-ray diffraction. In1 ·Gd and2 ·Dy, the structures of them are very similar with planar [Ln4 O2 ] cluster at the center, four Ln(III) ions in which are further coordinated by six L − and four beac − anions in the modes of μ 2 -η 2 η 1 for L − and μ 2 -η 2 η 1 for beac −, respectively. Additionally, the magnetic measurement of them reveal that1 ·Gd displays magnetic entropy change (−Δ S m ) of 21.55(3) J K −1 kg −1 at 2 K for Δ H = 7 T. For2 ·Dy, it exhibits slow magnetic relaxation behavior with the energy barrier (Δ E / k B ) of 27.96(7) K.