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The complexes of demethylcantharic acid coordinating with Zn~(2+), Cu~(2+), Ni~(2+) and Co~(2+) wereprepared and the five crystal structures were all determined by X-ray diffraction. Metal ions in thefive structures are of six-membered coordination. The demethylcantharate ions can act as a tri-,tetra- or penta-dentate ligand toward metal ions to form ion-pair structure, chain structure or threedimensional polymer structure respectively. The bridge oxygen atom in ligand always participatesin coordination. In the structures of KM(C_8H_8O_5)_2·6H_2O, the formal valence of M (Ni, Co) is+3, but the data of crystal structures show that M are M~(2+) ions and Ni may form a Ni~(2+) -stabilizedligand radical. In addition, the metal ions are assumed to be probes and some possible Interactionsbetween the acceptor and the receptor are discussed.
The complexes of demethylcantharic acid coordinating with Zn ~ (2+), Cu ~ (2+), Ni ~ (2+) and Co ~ (2+) wereprepared and the five crystal structures were all determined by X-ray diffraction ions in thefive structures are six-membered coordination. The demethylcantharate ions can act as a tri-, tetra- or penta-dentate ligand toward metal ions to form ion-pair structures, chain structure or threedimensional polymer structure respectively. The bridge oxygen atom in ligand always participates in coordination. In the structures of KM (C_8H_8O_5) _2 · 6H_2O, the formal valence of M (Ni, Co) is + 3, but the data of crystal structures show that M are M ~ (2+) ions and Ni addition form Ni 2+ (2+) -stabilized ligand and radicals. Among these metals ions are assumed to be probes and some possible Interactions between the acceptor and the receptor are discussed.