The Crystal Structure of Bis(2,2′-bipyridine)-catena-μ-tetrafluoroborato-copper(II) Tetrafluoroborate

Abstract

Abstract The crystal structure of the title compound was determined by means of the X-ray diffraction technique. The crystal is triclinic, space group P\barl, a=11.288(8), b=15.186(17), c=7.368(4) Å, α=74.93(3), β=78.23(3), γ=65.92(3)°, and Z=2. The structure was solved by the heavy-atom method and refined by the least-squares method to R=0.068 for 3678 non-zero reflections. The crystal is composed of BF4− ions and polymeric chains of [Cu(BF4)(bpy)2+] in which a tetrafluoroborate ion bridges two adjacent copper atoms through its two fluorine atoms. The coordination polyhedron around the copper atom is a tetragonally distorted octahedron; the four nitrogen atoms of bipyridine molecules in the equatorial plane are arranged in a flattened tetrahedral manner (average Cu–N=1.99 Å) and the two axial Cu–F distances are 2.566(6) and 2.662(4) Å. In both bipyridine molecules, the two pyridine rings are twisted slightly from each other; the interplanar angle is 3.1° in one bipyridine ligand and 10.2° in the other.