A Dy-based complex with the magnetic relaxation behavior regulated by enclosing one Dy-III ion into a Calix[8]arene ligand

摘要

A new Dy-Na complex [(DyNaI)-Na-III(CH3CO2)(2)(DMF)(3)(H(6)C8A)]center dot 4DME (1, DMF = N,N-ditnethylfonnamide, H(8)C8A = p-tert-butylcalix[8]arene) was obtained and it was characterized by elemental analyses, IR spectroscopy, single-crystal Xray diffraction analyses, PXRD and magnetic properties. In 1, one Dy-III and one Na-III were linked by two O atoms from two CH3CO2- and the two metal ions were enclosed into a H(8)C8A. The remaining coordination sites of the Dy-III and Na-I ions were occupied by time O atoms from three DMF coordinated molecules. The Dy-III ion in 1 adopts eight coordinate with a triangular dodecahedron. Magnetic property studies indicated complex 1 show slow magnetic relaxation behavior under 1000 Oe applied dc field. Additionally, the orientation of the anisotropy axis for the Dy-III in 1 was estimated by Magellan program and the anisotropic axis is aligned along Dy1-O2 bond with an angle of 12.608 degrees.