A Dinuclear Dysprosium(III) Single Molecule Magnet of Benzo[h]quinolin-10-ol

To develop single molecule magnets, a dinuclear complex [Dy2(HOBQ)4Cl6] (1) was prepared from the reaction of DyCl3 with benzo[h]quinolin-10-ol (HOBQ). Each Dy(III) ion shows a compressed octahedral geometry and the two Dy(III) ions in 1 are bridged by two Cl− ligands to construct a dinuclear structure with the four HOBQ ligands on the axial positions and six Cl− ligands in the equatorial plane. Magnetic measurements showed that complex 1 is a field-induced single molecule magnet having an obvious magnetic hysteresis loop with an energy barrier of 71(2) K. These experimental results are corroborated by the ab initio complete active space self-consistent field (CASSCF) calculations which also interpret the magneto-structural correlation. It is a typical example to achieve Dy(III) SMM through regulating coordination geometry, i.e., lengthening equatorial coordination bonds and shortening axial ones to form a compressed octahedral geometry.