摘要:
The title compound {systematic name: tetrakis(mu-3,5-dinitro-benzoato-k(2) O:O ') bis[(3,7- dihydro-1,3,7-trimethyl-1H-purine-2,6- dione-kO(2)) copper(II)]}, [Cu-2(C7H3N2O6)(4)(C8H10N4O2)(2)], consists of paddle-wheel dimeric tetrakis(mu-3,5-dinitro-benzoato- k(2)O: O ') dicopper(II) units with O-coordinated caffeine molecules in both apical positions. The entire dimeric molecule lies on a tetragonal inversion (4) over bar axis, and thus one nitrobenzoate anion with one Cu atom in a special position belong to the independent part of the molecule. The caffeine ligand bonded to the Cu atom is disordered on a local twofold non-crystallographic axis coincident with the (4) over bar axis. A pi-pi stacking interaction is observed between the caffeine rings and adjacent symmetry-related benzene rings of the 3,5-dinitrobenzoate anions.