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Mathematical model of filtration of contaminated solution in a filter with hard water softening on experimental data at the boundary
σ-π dative bond stabilizing copper active site drives CO2 electrocatalysis to hydrocarbon
Segmental body BIA device development for fracture detection
The molecular mechanism of fluoride export by the eukaryotic fluoride channel FEX
Long-term real-world performance of the Bayer Contour TS point-of-care testing glucose meters
Ligand-channel-induced ion liberation in crowded zwitterionic hydrogel electrolyte for efficient zinc metal batteries
Depressive symptoms are associated with a poor orientation toward the past during future self-projection
Multi-horizon flight trajectory prediction enabled by time-frequency wavelet transform
An integrated tiny-YOLO v3 and Q-iteration framework for stable, energy-efficient autonomous navigation of quadruped robots on AMB82-mini microcontrollers
Has the mysterious ‘compass’ organ of birds been found at last?
Tailoring interface-anchoring molecules for efficient and stable perovskite solar cells
The desire to avoid cognitive dissonance drives community formation in a social network model
Author Correction: A pangenome and pantranscriptome of hexaploid oat
Realization of a Dirac-vortex topological photonic crystal fiber
High-throughput tracking of freely moving Drosophila reveals variations in aggression and courtship behaviors
Temperature-regulated synthesis of carbonate-pillared zinc-triazolate frameworks for precise molecular recognition
Exploring the Structural, Optical, and electrochemical behavior of semicarbazone pyranoquinoline ligand (PQMHC) and its Cu(II) complex for efficient hydrogen peroxide sensing
Abstract The structural, morphological, and optical features of a newly synthesized PQMHC ligand and its Cu(II)-coordinated complex were thoroughly investigated using powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and UV–Vis diffuse reflectance spectroscopy. XRD results confirmed that the PQMHC ligand crystallizes in an orthorhombic phase (space group Imma ), while the Cu(II)-PQMHC complex exhibits a monoclinic phase (space group P2₁/m ), indicating successful coordination with the metal center. FE-SEM images showed vertically aligned nanofibers, with average diameters of approximately 73 nm for the ligand and 52 nm for the complex, supporting their potential in optoelectronic applications. Diffuse-reflectance UV-Vis spectroscopy coupled with Kubelka–Munk/Tauc analysis yielded optical band gaps of (2.661 and 2.460 eV in the direct transition case) and (2.305 and 1.896 eV in the indirect transition case) for PQMHC and Cu(II)–PQMHC, respectively, consistent with charge-transfer-mediated gap narrowing upon complexation. The electrochemical properties of the PQMHC ligand and its Cu(II)-PQMHC complex were investigated using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Both the ligand and its Cu(II) complex demonstrated efficient electron transfer and rapid, linear sensitivity toward hydrogen peroxide detection within the 0.05–1000 µM range and a detection limit of 0.009 µM using the chronoamperometric (CA) technique. These enhanced electrochemical characteristics suggest their potential suitability for applications in sensors and biosensors.