The title complex, 3,4-d]pyrimidine-4,6(5H,7H)-dione-N1}cadmium-(II),
was prepared as part of a study of the coordinating properties of the
xanthine oxidase inhibiting molecule, alloxanthine. [Cd(NO3)2(C5H4-N4O
2)2(H2O)2] contains monomeric centrosymmetric units with the Cd ion oc
tahedrally coordinated by two NO3 groups, two H2O molecules and by two
alloxanthine ligands. Alloxanthine coordinates monodentately through
the pyrazole N atom N(9). The H atoms of the 'neutral alloxanthine mol
ecule are bonded to the other atoms N(1), N(3) and N(8). The molecular
structure is stabilized by intramolecular bifurcated hydrogen-bonding
contacts of the type N-H...O, forming indirect chelates.