High Cell Volume Zn-Metal–organic Framework: Unveiling the Pseudo-capacitor Properties and Selective Colorimetric Recognition of Oxyanions

Metal–organic frameworks (MOFs) possess distinctive characteristics such as a significant specific surface area, specialized porous structures, multiple active sites, and outstanding electrochemical properties. Owing to their large-scale applications, in this work a new MOF Zn9(Cei)6(Bimb)9n (1), has been synthesized under room temperature conditions with H2Cei = bis(2-carboxyethyl) isocyanurate, Bimb = 1,4-bis[(1H-imidazol-1-yl)methylbenzene], which has an extra ordinary cell volume of 23,622.8 (3) Å3.The materials have been thoroughly analyzed using X-ray diffraction (SCXRD and PXRD), FTIR, scanning electron microscopy, energy dispersive X-ray spectroscopy, and Brunauer–Emmett–Teller. This study identifies, (1) as a highly effective luminescent sensor for Cr2O72–, CrO42–, and MnO4– anions in ethanolic solution with LOD values of 3.3 × 10–6 (0.640 ppm) for CrO42–, 8.1 × 10–6 (0.238 ppm) for Cr2O72–, and 8.1 × 10–6 (0.129 ppm) for MnO4– anions, respectively. The electrochemical properties of (1) were explored using cyclic voltammetry and galvanostatic charge–discharge study in 1 M TEABF4 in acetonitrile electrolytes. The electrode material exhibits a specific capacity of 33 F g–1 at a current density of 1 A g–1 based on a discharge period of 13 s. The electrode material demonstrates 78.2% capacitance retention after 10,000 cycles, making it a potential candidate for energy storage applications.