The Crystal Structure of Monoaquabis(1,10-phenanthroline)copper(II) Tetrafluoroborate [Cu(H2O)(phen)2](BF4)2

The crystal of the title compound is monoclinic, with a=19.099(6), b=8.100(3), c=16.177(5) Å, β=100.54(5)°, the space group of C2/c, and Z=4. The structure was determined from the counter data and was refined to R=0.083 for 1736 non-zero reflections. The coordination geometry of the copper atom is best described as a distorted trigonal bipyramid, in which the equatorial plane is composed of Cu, two N, and water O atoms, and the axial positions are occupied by two N atoms. The complex has a crystallographically imposed twofold axis which passes through the copper and the water oxygen atoms at the equatorial plane. The two phenanthroline ligands are related with each other by this axis.