Synthesis, Characterization and Antibacterial Activity of a Novel Photoluminescent Nb-Substituted Lindqvist Polyoxotungstate Based Organic Cation

Abstract

A novel heteropolyoxometalate, Nb-substituted hexatungstate compound; (C9H8N)3[NbW5O19]·3H2O triquinolinium μ6-oxido-dodeca-μ2-oxidohexaoxido[niobium(V)pentatungsten(VI)]ate trihydrate (QNbW5) has been grown by slow evaporation method and characterized by powder X-ray and single-crystal XRD methods, NMR, IR, UV–Vis and photoluminescence spectroscopy measurements, elemental analysis and thermogravimetric analysis. Single-crystal XRD analyses show that QNbW5 crystallizes in the triclinic space group \({\text{P}}\overline{ 1}\) and its crystal structure consists of 3D grid-like network of components in a close connection through N–H···O, C–H···O and offset π···π stacking interactions between neighboring rings of quinolinium moieties. Moreover, the spectroscopic and electronic properties of QNbW5 have also been investigated showing a considerable important gap energy well confirming the semiconductor behavior and the blue photoluminescent property of reported material. In addition, the complex shows promising antimicrobial activity against four pathogenic microbes in comparison with its components alone.