Keggin and Anderson POM-based hybrids modified by 4-pyridinepropanol: Synthesis, crystal structures, photophysical and DNA binding properties

Abstract

In this study, we synthesized two hybrid compounds based on Anderson [C₁₆H₃₄N₂Mo₆AlNaO₂₈] (AL) and Keggin [C₃₂H₄₈N₄Mo₁₂SiO₄₄] (KL) polyoxometalate (POM) and characterized their structures by various spectroscopic methods. In order to decorate Anderson and Keggin POM compounds, 4-pyridinepropanol (4-PyP-OH) compound was used and the organic–inorganic hybrids were prepared. The single crystals of the organic–inorganic hybrids AL and KL were obtained from aqueous solution and their molecular structures were solved by X-ray crystallography method. DNA binding properties of the hybrids AL, KL, POMs and 4-PyP-OH were investigated by the electronic spectroscopy and viscosity measurements. The emission and excitation properties of the compounds were investigated by the photoluminescence method. The redox properties of the compounds were investigated by cyclic voltammetry method in the −1.0 – 1.5 V range and it was determined that they generally exhibit irreversible redox events in this potential range. Thermal behaviours of the hybrids AL and KL in the 20–750 °C temperature range were investigated by the thermal methods.