New dinuclear lanthanide(III) complexes based I on an 8-hydroxyquinoline Schiff base derivative and beta-diketonate ligands, [Ln(2)(hfac)(4)(L)(2)] (Ln(III) = Gd (1), Tb (2), Dy (3), Ho (4), Er (5)), [Ln(2)(tfc)(4)(L)(2)] (Ln(III) = Gd (6), Tb (7), Dy (8), Ho (9)), and [Dy(bfac)(4)(L)(2)center dot C7H16] (10) (L = 2-[[(4-fluorophenyl)imino] methyl]-8-hydroxyquinoline, hfac = hexafluoroacetylacetonate, tfac = trifluoroacetylacetonate, and bfac = benzoyltrifluoroacetone), have been synthesized. The single-crystal X-ray diffraction data show that complexes 1-10 are phenoxo-O-bridged dinudear complexes; each eight-coordinated center Ln(III) ion is in a slightly distorted dodecahedral geometry with two bidentate beta-diketonate coligands and two mu(2)-O bridging 8-hydroxyquinoline Schiff base derivative ligands. The magnetic study reveals that 1 and 6 display cryogenic magnetic refrigeration properties, whereas complexes 3, 8, and 10 show different SMM behaviors with energy barriers of 6.77 K for 3, 19.83 K for 8, and 25.65 K for 10. Meanwhile, slow magnetic relaxation was observed in 7, while no out-of-phase alternating-current signals were found for 2. The different dynamic magnetic behaviors of two Tb-2 complexes and the three Dy-2 complexes mainly derive from the tiny crystal structure changes around the Ln(III) ions. It is also proved that the beta-diketonate coligands can play an important role in modulating magnetic dynamics of the lanthanide 8-hydroxyquinoline Schiff base derivative system.