Synthesis, crystal structure, and magnetic properties of a copper(II) octacyanotungstate(V)-based magnet containing two types of organic ligands

Cu3[W(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.

Graphical abstract[Cu3[W(CN)8]2(pyrimidine)2(3-cyanopyridine)2 · 4H2O]n, a three-dimensional cyanide-bridged copper(II) octacyanotungstate(V) containing two different organic ligands (pyrimidine and 3-cyanopyridine), is prepared, and 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.Figure optionsDownload full-size imageDownload as PowerPoint slide