Mugberia Gangadhar Mahavidyalaya, established in 1964, is one of the oldest colleges in Purba Medinipur district, West Bengal, India. It offers undergraduate courses in arts, commerce and sciences. It is affiliated to Vidyasagar University.
Three trinuclear Cd(II) complexes bearing NO3- (1), I- (2), and SCN- (3) as counter anions are synthesized using a salane-type N2O2 Schiff base ligand (H2L). Single-crystal X-ray diffraction reveals structural similarities, with the terminal Cd(II) ions adopting octahedral geometry in 1 and trigonal bipyramidal geometry in 2 and 3, while the central Cd(II) consistently exhibited a rare dodecahedral geometry, irrespective of the anion. Band gap analyses and current-voltage measurements demonstrate that the anionic residues strongly influence the electronic properties. Among them, complex 1 shows superior Schottky diode performance, attributed to both its lower band gap and additional weak interactions from the NO3- group, highlighting its promise for electronic device applications.
Ascorbic acid (AA) (C6H8O6), also known as vitamin C, is a water-soluble vitamin consisting of a skeleton of six-carbon lactone derived from fruits and vegetables. Detection of ascorbic acid in cells is crucial for evaluating antioxidant status, maintaining redox balance, supporting enzymatic functions, and monitoring cellular health under physiological and pathological conditions. The present study highlights the development of luminescent carbon quantum dots (CQDs) using a locally available mat stick plant, and the resulting CQDs are characterised using FTIR, UV, SEM, TEM, EDAX, and XPS studies. The quenching of the luminescence properties of CQDs is observed in the presence of Fe(iii) ions with a quenching constant value of 5.80 & times; 105 M-1, and this quenching is subsequently inhibited by the addition of AA, resulting in recovery of fluorescence. The fluorescence intensity of the CQDs/Fe(iii) sensor shows a linear relationship with ascorbic acid concentration over the range of 0-100 & micro;M, with a limit of detection (LOD) of 4.68 & micro;M. This sensing system offers ultrafast detection with a micromolar detection limit, outperforming many existing assays. Notably, it demonstrates good selectivity for AA detection in the presence of various biomolecules. As a practical application, the CQDs/Fe complex can detect ascorbic acid in different fruit samples and human plasma samples. Besides, CQDs can be effectively used as a fluorescence ink. The system's applicability is successfully validated in real sample assays, yielding satisfactory results. This CQD-based sensing system holds promise for efficient AA detection in various applications.
An azo-functionalized Rhodamine-B based chemosensor, HL [4-((E)-(3-((Z)-((3',6'-bis(diethylamino)-3-oxospiro[isoindoline-1,9'-xanthen]-2-yl)imino)methyl)-5-ethoxy-4-hydroxyphenyl)diazenyl)benzoic acid], has been developed and spectroscopically characterized. Impressively, among competitive cations, the sensor can detect Al(III) and Fe(III) in a methanol-water (9:1, v/v) medium by changing its optical color and turning on fluorescence response. The low limit of detection (LOD) value (72 µM) and the sensor's reproducibility assure us about its practical applicability. The spirolactam ring opening in the presence of two target cations induces the luminescence character to the chemosensor, and the NMR spectrum validates this fact. The HL-Al(III) complex can selectively detect F- ion among several competing anions via turn-off fluorescence in a methanol-water medium. Coordination of F- to the metal ion frees the bare probe with its ring-closing form, leading to fluorescence quenching. Mass spectral data and Job's plot confirm the 1:1 probe-analyte stoichiometry. As a practical application, the sensor can quantify Al(III) in commercially available pharmaceutical samples, and the Sensor-Al(III) complex can detect F- in locally available water samples.
This study explores the bioinorganic potential of selenium nanoparticles (SeNPs) biosynthesized by Bacillus sp. (AKS_bp1, PQ824612) in mitigating hexavalent chromium [Cr(VI)] toxicity in chickpea (Cicer arietinum L.). SeNPs were produced via microbial reduction of sodium selenite and characterized by nanoscale size ( 100–150 nm), negative surface charge (− 20 mV), and biomolecular capping. Under controlled hydroponic Cr(VI) exposure (0–100 ppm), SeNP treatment significantly reduced Cr accumulation in plant tissues, with decreases of 24
