Abstract
We have synthesized a mononuclear Dy(III)-based complex, [Dy(CyPh2PO)3Cl3)] (1) (CyPh2PO = cyclohexylbisphenylphosphine oxide), constructed from a phosphine oxide ligand and a light halogen Cl donor. The Dy(III) ion presents an octahedral geometry where two O atoms from two phosphine ligands locate at two vertexes, while the equatorial positions are completed by three Cl anions and a O atom from another phosphine ligand. Magnetism results reveal that slow relaxation of the magnetizations exists in 1 under an extra dc field because of the significant quantum tunnelling of magnetization (QTM) at 0 Oe dc field. The lighter Cl ions in equatorial plane result in a larger effect to QTM, and thus smaller contribution to slow magnetic relaxation.
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