Abstract
Four new dinuclear lanthanide compounds, [Ln(hfac)(2)L](2) (Ln(III) = Eu (1) and Tb (2)) and [Ln(tfac)(2)L](2)center dot(C2F16)(x) (Ln(III) = Tb (3), Yb (4), HL = 2-1[(4-iodophenyl)irnino]methy1]-8-hydroxyquinoline, hfac = hexafluoroacetylacetonate, tfac = trifluoroacetylacetonate), 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 two bidentate hfac(-) and two mu(2)-O bridging 8-hydroxyquinoline Schiff base ligands. Magnetic measurements indicated that slow magnetic relaxation behaviors were observed in 2 under 0 dc field, with an optimized dc field of 2000 Oe for 2, the quantum tunneling of the magnetization was suppressed with Delta E/k(B) of 6.72 K. However, no evident ac magnetic signals were observed in 3 under 0 dc field. The distinct single-molecule magnets behaviors are mainly due to the slight different coordination environments around central Tb-III ions of 2 and 3. (C) 2018 Elsevier B.V. All rights reserved.