Sandwiched Cobalt Complex Using Inorganic Lig and [tiw9o34]: Synthesis, Characterization and Photoelectrochemical Sensing

Polyoxometalates containing titanium (Ti-POMs) related to semiconductor TiO2 have potential applications in photocatalysis, photovoltaics and semiconducting materials. In this paper, we synthesized a Ti-POM, Na2H10[Co-4(H2O)(2)(TiW9O34)(2)]center dot 48H(2)O (1), by one-pot self-assembly reaction. In its crystal architecture, sodium ions connect multiple monomer units to form a layered structure. The electrochemical properties of 1 were investigated by cyclic voltammograms. The semiconductor band gap (Eg) value of 1 was calculated through diffuse reflection UV-vis spectroscopy. Furthermore, 1 was used as a semiconductor material and applied to photoelectrochemical sensing to detect dopamine with different concentrations in aqueous solution. The above-mentioned results open up an opportunity to develop polyoxometalate-based, titanium-containing coordination complexes with functional properties and lay the foundation for detection of other biological targets.