Six bioactive Cu(II) complexes (1-6) derived from iodine containing nitrogen-rich ligands, bis(3,5diiodosalicylidene) carbohydrazone (H4L1), bis(3,5-diiodosalicylidene) thiocarbohydrazone (H4L2) and 1,3-bis (2-hydroxy-3,5-diiodophenyl-methylideneamino) guanidine (H5L3) were synthesized and characterized using spectral and analytical methods. The ligands displayed versatile coordination behavior and form mono- and binuclear Cu(II) complexes, utilizing different coordination modes. Band gap values, calculated experimentally for all the complexes, were substantiated with DFT calculations. The in vitro and in silico evaluations of the compounds revealed their highly promising antifungal properties. Notably, the three ligands as well as the complex 3 showed superior antifungal effectiveness than the standard drug amphotericin B. MIC values confirm higher antifungal abilities of the ligands and complex 3, establishing their status as a more appealing candidate compared to amphotericin B. The in vitro and in silico antibacterial studies of the compounds reveal the significant activity relative to the standard drug ciprofloxacin. Furthermore, in silico studies emphasize the remarkable binding affinity of Cu(II) complexes towards DNA (1BNA) and SARS-CoV-2 main protease (Mpro). These complexes demonstrate improved binding interactions compared to established repurposed drugs for covid-19, suggesting their potential as highly effective agent for targeting these crucial biological macromolecules.
The impact of color on consumer perception of meat quality, market, and value continues to play an important role. This work discusses the recent progress of meat color measurement of meat color with emphasis on the technological advancements and issues related to its objective measurement using instrumental, digital, and spectroscopic approaches. Tools of colorimetry such as HunterLab and Minolta with CIE Lab* system are colorimeters with high repeatability and precision of lab results, even achieving standard deviations of L* values as low as ± 0.5. Their performance is severely restricted by the heterogeneous nature of meat surfaces, not to mention the lack of real-time applicability. The latest developments in hyperspectral imaging (HSI) and portable spectrometers have further increased spatial resolution to 0.01 mm squared, resulting in over 90
A mononuclear, bis(3,5-dimethyl-IH-pyrazole) bis{2-(phenylamino) benzoate} zinc(II)] (1) and a trinuclear zinc complex, bis(3,5-dimethyl-IH-pyrazole){hexa[mu (2)-2-(phenylamino)benzoate]}trizinc(II)] (2), using fenamic acid (Hfa) and 2,5-dimethylpyrazole (Hdpz) have been successfully synthesized and comprehensively characterized. The structural elucidation was carried out using IR, UV-Vis, H-1 NMR, and mass spectrometry, with single-crystal X-ray diffraction (SCXRD) confirming the supramolecular architectures. Photoluminescence properties were investigated using fluorescence spectroscopy. Thermal stability was evaluated via thermogravimetric analysis. Hirshfeld surface analysis and 2D fingerprint plots revealed detailed insights into intermolecular interactions and packing efficiency, contributing to the understanding of crystal stability. Furthermore, molecular docking studies were performed to assess interactions with human serum albumin and B-DNA dodecamer, highlighting the influence of molecular size on docking affinity and structural compatibility in biological systems. In vitro antibacterial activity was evaluated against Staphylococcus aureus, Klebsiella pneumoniae, Proteus mirabilis, and Escherichia coli, where both complexes demonstrated significant antimicrobial efficacy. These findings underscore the potential of the synthesized zinc complexes as multifunctional agents in supramolecular chemistry and pharmacological applications.
As aerospace technology rapidly progresses and space environments become more sophisticated, the need for aircraft components made of lightweight, thermally insulating, and advanced thermal conductive materials has soared. The research of triply periodic minimal surface (TPMS) structures has grown into a research hotspot due to their unique thermal and mechanical properties. However, research on the thermal conductivity of TPMS structures featuring varying cell sizes is quite limited. Therefore, this research proposes a new method for gradient adjustment of TPMS cell sizes. A constant temperature heating experiment at 300 °C was conducted on four TPMS wings with different cell size gradients using an active cooling experimental platform, and comparisons were made with two TPMS wing structures with uniform cell sizes. The results showed that within the inlet velocity range of 1.06–12.72 m/s, the wing with a cell size of 10–12–10 mm exhibited the highest overall convective heat transfer coefficient. Compared to wings with cell sizes of 10 mm, 12 mm, 10–12 mm, 12–10 mm, and 12–10–12 mm, the overall convective heat transfer coefficient of the 10–12–10 mm wing increased by 1.3–6.2%, 28.8–63.2%,15.1–44.6%,7.5–33.5%, and 21.2–49.6%, respectively. Additionally, in accordance with the experimental measurements, the relationships between the Nusselt number, friction coefficient, convective heat transfer coefficient, overall heat transfer coefficient, and Reynolds number were geometrically defined. The results of this study offer a strong theoretical foundation and actionable insights for effective thermal regulation of aircraft surface configurations in the production of the lightweight aviation manufacturing industry.
The present study explores the synthesis, characterization and detailed analysis of a copper(II) chelate [Cu(bsde)NCS], derived from the in-situ condensation of 3,5-dibromosalicylaldehyde and N,N-dimethylethylenediamine, incorporating a pseudohalide, thiocyanate (NCS-). The characterization techniques combined single crystal X-ray diffraction, electronic, FT-IR and EPR spectroscopy. SCXRD analysis reveals that the complex crystallized in the monoclinic space group P2(1)/n, with a slightly distorted square planar geometry around the copper(II). The EPR spectroscopy revealed an axial spectrum with g(||) > g(perpendicular to), suggesting a distorted square planar geometry. Further insights into crystal packing and intermolecular interactions were gained through Hirshfeld surface analysis. In addition, the antioxidant activity of the complex using the DPPH radical scavenging assay, revealed promising free radical quenching efficiency.
