The Crystal Structure of Bis(2,2′-bipyridine)nitratocopper(II) Nitrate Monohydrate [Cu(NO3)(bpy)2]NO3·H2O

Abstract

Abstract The crystal structure of the title compound has been redetermined from diffractometer data and refined by the least-squares method to R=0.053 for 2448 non-zero reflections. The crystal is triclinic, with a=7.464(3), b=10.002(5), c=15.503(6) Å, α=111.50(5), β=91.43(5), γ=90.47(4)°, space group P\bar1, and Z=2. The copper atom has a square-pyramidal coordination very distorted by the 4 N atoms of the bipyridine ligands and one of the O atoms of the nitrato ligand at the apical position. The disposition of the 4 N atoms at the basal plane is flattened tetrahedral. The Cu atom is displaced by 0.31 Å from the mean plane of the 4 N atoms towards the apical O atom. The Cu–O and the average Cu–N distances are 2.30 and 2.01 Å respectively. In both bipyridine molecules, the two pyridine planes are twisted slightly from each other; the interplanar angle is 2.6° in one bipyridine ligand and 6.0° in the other. The mean planes of the two bipyridine molecules make an angle of 44.6°.