Figure 1 Thermal ellipsoid plot of 1 (50% probability) showing the asymmetric unit and the three 1,4-pyrazinedioxide molecule that lie about inversion centers. Labeled atoms are related to unlabeled atoms by the symmetry operations: -x+1, -y+1, -z+1 for Cu(H2O)6,2+, -x, -y+1, -z for N11, C12 and C13; -1-x, -y, -z for N21, C22 and C23. Only those hydrogen atoms whose positions were refined and are involved in hydrogen-bonding are labeled.  [article HTML]