Three dinuclear complexes, [Tb-2(H(2)daps)(2)(CH3OH)(5.5)(H(2)0)0.5](C1)(2) (Tb(2)C1), [Dy-2(H(2)daps)(2)(CI)(CH30H)3(H(2)0)]Cl (Dy(2)C1), and [Dy-2(H(2)daps)(2)(H(2)0)6](CF3S03)(2) (Dy(2)CF3S03), as well as the heterohexanuclear compound [Zn(2)Dy4(daps)(2)(Hdaps)(C1)3(OH)(2)(CH3OH)(H2O)(5)] (Zn2Dy4) (H(4)daps: (2),(6)-bis(1-salicyloylhydrazonoethyl)pyridine), which crystallize with different lattice molecules, show their hexa- or heptadentate hydrazone ligands acting with hitherto unknown mu(2)-kappa(5):kappa(1), mu(3)-kappa(5):kappa(4):kappa(1):kappa(1), or //4ics:x(2):K1:xl bridging modes. The single X-ray crystal structures of the dinuclear complexes show nine-coordinated N3O6 environments for lanthanoid atoms in Tb2Cl and Dy(2)CF3S03, with distorted geometries, between spherical capped square antiprism and muffin-like, while the dysprosium atoms in Dy(2)C1 are eight coordinated, with distorted triangular dodecahedron geometries. In the case of Zn2Dy4, both eight-coordinated, 0, and 07C1, as well as nine-coordinated N3O6 environments coexist in the crystal structure, with biaugmented trigonal prism, triangular dodecahedron, and muffin-like pseudogeometries. The magnetic study of all the complexes shows that none of the pure samples behaves as a single molecular magnet (SMM) and that the quantum tunnel cannot be removed by dilution of any of the dinuclear complexes, but except in diluted [Y1.904Dy0.096(H(2)daps)(2)(C1)(H2O)(4)]Cl (Dy(2)ClgY), behaves as a weak field induced SMM. The heterohexanuclear Zn2Dy4 complex also lacks slow relaxation of the magnetization.