Abstract
Two clusters with formula [Ln4(μ4-O)(HL)3(SCN)4(H2O)2] (Ln=Dy (1), Er (2)) were assembled by the hydrothermal reaction of Ln(SCN)3 hydrate and symmetrical amidate H3L ligand (2-hydroxy-N-[2-hydroxy-3-[(2-hydroxybenzoyl)amino]propyl]benzamide) in the presence of triethylamine. X-ray crystallographic analysis reveals that 1 and 2 are isostructural and are tetranuclear with a μ4-O centred Ln4 tetrahedron core, in which four crystallographically unequivalent lanthanide ions are all seven-coordinated in distorted capped octahedron geometries. Significantly, both clusters show chirality that is induced by coordination of spirally twisted ligands. The magnetic properties of 1 and 2 have been investigated. Both clusters do not exhibit slow magnetic relaxation that may be ascribed to the effect of the symmetry of ligand field on the oblate Dy3+ and prolate Er3+ ions, as well as the regular tetrahedral core.
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