Synthesis,crystal structure,and magnetic properties of a copper(II) octacyanotungstate(V)-based magnet containing two types of organic ligands |
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| Authors: | Souhei Kaneko Yoshihide Tsunobuchi Koji Nakabayashi Shin-ichi Ohkoshi |
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| Institution: | Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;Department of Chemistry, University of Florida, Gainesville, FL, USA |
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| Abstract: | Cu3W(CN)8]2(pyrimidine)2(3-cyanopyridine)2 · 4H2O, a cyanide-bridged copper(II) octacyanotungstate(V) with two types of organic ligands (pyrimidine and 3-cyanopyridine), is prepared. In this compound, the coordination geometry of W is an 8-coordinated bicapped trigonal prism where five CN groups of W(CN)8] are bridged to five Cu ions, and the remaining three CN groups are free. The coordination geometries of the three types of Cu ions (Cu1, Cu2, and Cu3) are 6-coordinated pseudo-octahedron. The cyano-bridged-Cu2–W–Cu3-layer is linked by a Cu1 pillar unit, and a cavity along the a axis, which is occupied by 3-cyanopyridine molecules and zeolitic water molecules, exists. The present compound shows ferrimagnetism with a Currie temperature of 7 K, a saturation magnetization of 2.9 μB, and a coercive field of 7 Oe at 2 K. |
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