Structures, fluorescence properties and magnetic properties of a series of dinuclear lanthanide(III) compounds: Dy-2 compound showing single-molecule magnet behavior

摘要

A series of dinuclear lanthanide(III) compounds, namely, [Ln(2)(tmhd)(2)L-2(CH3OH)(2)](Ln(III) = Sm (1), Eu (2), Dy (3) and Er (4); H2L = 2-amino-benzoic acid (8-hydroxy-quinolin-2-ylmethylene)-hydrazide, Htmhd = 2,2,6,6-tetramethyl-3,5-heptanedione), have been synthesized, structurally and magnetically characterized. The X-ray structural analysis exhibit that 1-4 are phenoxo-O-bridged dinuclear compounds and central Ln(III) ions are eight-coordinated with one bidentate tmhd(-), one CH3OH and two mu(2)-O bridging Schiff base ligands. Magnetic measurements indicated that slow magnetic relaxation behaviors were observed in 3, with energy barrier (Delta E/k(B)) of 13.14 K and tau(0) = 4.58 x 10(-6) s, however, no out-of-phase (chi") alternating current (ac) signals noticed in 1, 2 and 4. Additionally, solid-state luminescence properties reveal that 1-3 display the characteristic Ln(III) luminescence at room temperature. (C) 2017 Elsevier Ltd. All rights reserved.