A new
-Keggin POM derivative
(
1) (DF = 4,5-diazafluoren-9-one) has been prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, IR, XPS spectra, thermogravimetric analysis and cyclic voltammetry. In compound
1, the polyoxoanion cluster
is decorated by a single capping {Cu(DF)}
2+ subunit
via four bridging oxygen atoms on a {Mo
4O
4} pit. The isolated copper dimer unit
acts as counter cation, in which the organic ligand DF exhibits a rare coordination mode. Furthermore, the capped Keggin polyoxoanions
are fused together
via the copper dimers through the weak Cu
O interactions to form chains. Hybrid
1 was used as a solid bulk modifier to fabricate a carbon paste electrode (
1-CPE) by direct mixing. The electrochemical and electrocatalytic behaviors of the
1-CPE have been studied in detail.