Nine new tetranuclear centrosymmetric linear complexes, [RE(dbm)L(DMF)]·nCHCl·mCHN (RE = Y (1), Tb (2), Dy (3), Ho (4), Er (5), Lu (6)) and [RE(dbm)L(CHOH)]·nCHCN (RE = Tb (7), Dy (8), Ho (9)) (HL = 2-[(2-(hydroxyimino)propanehydrazide)methyl]-8-hydroxyquinoline and dbm = 1,3-diphenyl-1,3-propanedione) have been synthesized. Complexes 1-9 are tetranuclear complexes. Magnetic studies reveal that both Dy-based complexes (3 and 8) exhibit single-molecule magnet (SMM) behavior under a zero dc field. Furthermore, complex 3 presents one relaxation process under a zero dc field, while application of an external dc field (1500 Oe) induces multi-relaxation signals of the ac magnetic susceptibility.
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