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Lim, Kwang Soo,Baldoví,, Josex301,J.,Jiang, ShangDa,Koo, Bong Ho,Kang, Dong Won,Lee, Woo Ram,Koh, Eui Kwan,Gaita-Arinx303,o, Alejandro,Coronado, Eugenio,Slota, Michael,Bogani, Lapo,Hong, Cha ACS AMERICAN CHEMICAL SOCIETY 2017 Inorganic Chemistry Vol.56 No.9
<P>Controlling the coordination sphere of lanthanoid complexes is a challenging critical step toward controlling their relaxation properties. Here we present the synthesis of hexacoordinated dysprosium single-molecule magnets, where tripodal ligands achieve a near-perfect octahedral coordination. We perform a complete experimental and theoretical investigation of their magnetic properties, including a full single-crystal magnetic anisotropy analysis. The combination of electrostatic and crystal-field computational tools (SIMPRE and CONDON codes) allows us to explain the static behavior of these systems in detail.</P>
Lim, Kwang Soo,Baldoví,, Josex301,J.,Lee, Woo Ram,Song, Jeong Hwa,Yoon, Sung Won,Suh, Byoung Jin,Coronado, Eugenio,Gaita-Arinx303,o, Alejandro,Hong, Chang Seop American Chemical Society 2016 Inorganic Chemistry Vol.55 No.11
<P>The symmetry around a Dy ion is recognized to be a crucial parameter dictating magnetization relaxation dynamics. We prepared two similar square-antiprismatic complexes, [Dy(L-OMe)(2)(H2O)(2)](PF6) (1) and Dy(L-OMe)(2)(NO3) (2), where L-OMe = [CpCo{P(O)(O(CH3))(2)}(3)], including either two neutral water molecules (1) or an anionic nitrate ligand (2). We demonstrated that in this case relaxation dynamics is dramatically affected by the introduction of a charged ligand, stabilizing the easy axis of magnetization along the nitrate direction. We also showed that the application of either a direct-current field or chemical dilution effectively stops quantum tunneling in the ground state of 2, thereby increasing the relaxation time by over 3 orders of magnitude at 3.5 K.</P>