Copper(II) Tetrafluoroborate Hexahydrate: Preparation, Structure and Raman Spectrum

Previously unknown crystal structure of a copper(II) tetrafluoroborate hexahydrate salt was determined using single crystal X-ray diffraction. The unit cell parameters were determined at different temperatures (90, 150 and 270 K). The structure is isotypical with copper(II) perchlorate hexahydrate. The Raman spectrum was also recorded and discussed.

The K.P.I. coefficient (78.0) and the FUV index (256.21 Å³) indicating very effective packing of the ions in the discussed structure, whereas the β angle is very close to the 90° and, in this way, the crystal could undergo a monoclinic \(\to \) $\to$ orthorhombic phase transition at some lower temperatures.