Field-induced single molecule magnet behavior of a three-dimensional Dy (III)-based complex

摘要

A novel three-dimensional Dy(III)-based complex [Dy(H-2-DHBDC)(0.5)(DHBDC)(0.5)(C2H5OH)(H2O)](n)center dot H2O (H-4-DHBDC = 2,5-dihydroxy-1,4-terephthalic acid) (1) was fabricated using a hydrothermal method. Such complex was examined by single-crystal X-ray diffraction analysis and then characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, powder X-ray diffraction as well as magnetic properties. The results of single -crystal structure analysis suggested that complex 1 consisted of three-dimensional framework structure and crystallized in the monoclinic system, space group P21/c. The Dy-III ion in 1 adopted eight-coordination mode with a triangular dodecahedron. The results of magnetic property investigations suggested that the co-ordination polymer exhibited slow magnetic relaxation behaviors under 1500 Oe dc field. Furthermore, the frequency dependence of out-of phase (chi '') ac signals for complex 1 displayed two maxima at low temperature, indicating the presence of two relaxation processes.