Sandwiched cobalt complex using inorganic lig and [TiW₉O₃₄]: synthesis, characterization and photoelectrochemical sensing

Abstract

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[Co₄(H₂O)₂(TiW₉O₃₄)₂]·48H₂O (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.

Graphical Abstract

Keywords:

• Titanium-containing polyoxomolybdates
• crystal structure
• dopamine
• photoelectrochemical sensing

Supplementary materials

IR spectra, XRD, UV/vis spectra, Mott-Schottky plot, EDS spectrum and the TGA curve, BVS and Crystal data are available for 1. Supplementary data associated with this article can be found in the online version.

Acknowledgement

The authors are thankful for financial support from the Natural Science Foundation of China.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research was supported by Natural Science Foundation of China (Grant Nos. 21671035 and 22071018).