Acenaphthimidazole derivatives are promising materials for optoelectronic and sensing applications owing to their structural rigidity and tunable photophysical properties; however, low fluorescence efficiency limits their practical utility. Herein, we report the synthesis of a fused imidazole-acenaphthimidazole derivative, 8-(2,4-difluorophenyl)-7-(3,5-dimethoxyphenyl)-7H-acenaphtho[1,2-d]imidazole, via a high-yield multicomponent approach. Structural characterization was performed using FTIR, 1 H NMR, 13 C NMR, and GC-MS. Optical and thermal properties were evaluated by UV-visible, photoluminescence, and TGA-DSC analyses. DFT calculations (B3LYP/6-31G(d,p), Gaussian 09) yielded a HOMO-LUMO gap of 3.47 eV, consistent with experimental estimates (Eg = 1240/λ_onset), and indicated a high dipole moment and first hyperpolarizability. These results highlight the compound's potential for non-linear optical and photonic applications.
This study reports a facile and ecofriendly synthesis of europium sesquioxide (Eu 2 O 3 ) nanoparticles using Dragon Blood Resin (Daemonorops draco Blume) extract as a natural agent. The nanoparticles were characterized by FTIR, XRD, FE-SEM with EDS, UV-Vis, diffuse reflectance spectroscopy (DRS), and photoluminescence spectroscopy. FTIR confirmed Eu-O vibrational modes (528-858 cm −1 ), while XRD of the 800℃ product revealed a cubic structure with an average crystallite size of 28 nm (the 500℃ product was only partially amorphous). FE-SEM showed spherical morphology, and EDS composition was consistent with Eu 2 O 3 . Optical bandgap analysis using Tauc plots derived from UV-Vis and DRS measurements yielded bandgap values of approximately 4.1 and 3.85 eV, respectively, consistent with the wide-bandgap semiconducting nature of Eu 2 O 3 nanoparticles. Photoluminescence spectra showed features near 504 nm (255 nm excitation) and 786 nm (395 nm excitation); as these wavelengths lie close to twice the respective excitation wavelengths, second-order diffraction or scattered-excitation artefacts cannot currently be excluded, and confirmatory measurements (order-sorting filters, excitation-wavelength dependence, fluorescence lifetime) are needed before these features can be attributed to genuine Eu 2 O 3 photoluminescence. Preliminary confocal imaging of treated cells in the blue-green-red range showed luminescence signals consistent with cellular association, though cytotoxicity, vehicle controls, biological replicates, and internalization-specific imaging remain to be established before a bioimaging application can be considered validated.
Nano Al 2 O 3 /reduced graphene oxide (rGO) composites were directly synthesized by a simple low-temperature heat treatment using nano Al 2 O 3 and GO powders as raw materials. The degradation capability of the samples toward methylene blue (MB) was tested under simulated sunlight. Results show that low-temperature heating can induce a reduction reaction in GO and facilitate its transformation into rGO. Simultaneously, rGO may be fully composited with nano Al 2 O 3 to obtain Al 2 O 3 /rGO composites. The addition of GO markedly enhances the light absorption capacity of the samples in the entire light region. The fluorescence intensity of the sample can be reduced by adding a proper amount of GO. The obtained sample exhibited the best simulated solar photocatalytic activity when the amount of GO added was 15[Formula: see text]wt.%, and MB was degraded within 60 min.
Zinc oxide plays an important role in current industry due to its special characteristics such as low electron conductivity, anti-corrosion, anti-bacteria, and excellent optical and sensing properties. Therefore, thick films of undoped ZnO and Hf/In-doped ZnO were synthesized by screen-printing method. The microstructural and optical properties of prepared films were studied in order to study the effects of variation in dopant ions, dopant concentration, and annealing temperature. Microstructural studies carried out by X-ray diffraction analysis revealed the hexagonal ZnO formation at 300 ∘ C. Enhancement in annealing temperature from 300 ∘ C to 500 ∘ C significantly increased the crystallite size and affected the lattice strains. The doping of Hf as well as In both induced microstructural changes by improving the preferential orientation of crystallinity. The increase in doping concentration enhanced the crystallite size of ZnO, which in turn induced the band-gap narrowing.
