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Two new isomorphic metal complexes, [M(phon)(H 2 O) 4 ]·SO 4 ·2H 2 O (M = Ni and Zn,  1-Ni  and  1-Zn , respectively, phon = 1,10-phenanthroline-5,6-dione), were crystallized at room temperature. Single-crystal X-ray analyses reveal that a metal ion is coordinated with one phon ligand and four coordinated water molecules into a discrete coordination structure which expands into a 3D supramolecular structure via hydrogen bonding interactions. The thermal and electrochemical properties of the complexes are investigated. The results show that  1-Ni  exhibits redox activity under alkaline conditions and has potential to act as a redox reaction mediator, while  1-Zn  does not. The specific capacitance of  1-Ni 0.5 Zn 0.5, obtained by mixing the two complexes under hydrothermal condition, is four times higher than that of  1-Ni .

Synthesis, crystal structures, and electrochemical properties of metal complexes based on 1,10-phenanthroline-5,6-dione