Polycyclic Aromatic Compounds最新文献

Herein we report the synthesis and biological evaluation of a new series of thiazolidin-4-one derivatives. The C4 and C5 functionalized, 5-arylidene/alkylidene, 5-bromo, 5-pyridinium, and 4-arylimino analogs of thiazolidine-4-one were prepared efficiently using appropriate synthetic routes and characterized by IR, NMR and Mass spectrometry. Results of antimicrobial evaluation showed that compounds 4 and 8 had significant antibacterial activity comparable to that of the reference drug gentamicin. Compound 5a showed promising antifungal activity compared to amphotericin B as a reference drug. The antitumor activity revealed that compound 4 was the most active analog among the tested series with IC₅₀ values of 28.4 and 12.6 µg/mL against both HCT-116 and HepG-2 cell lines, respectively, compared to standard drug doxorubicin. Results from the biological evaluation, in-silico molecular docking studies, and ADMET analyses confirmed that thiazolidin-4-one is a promising scaffold that can be used to design potential lead compounds for the antibacterial and antitumor agents.

This work highlighted the proficient and naturally safe methodology for the phenol synthesis using biocatalyst lipase. The development of sustainable synthetic protocol for various organic transformations is an important area of research attracts researchers to avoid use of volatile and hazardous organic solvents in reaction for greener and eco-friendly protocols. Lipase is subclass of esterase enzymes and acts as biocatalyst with industrial significance. They carry out biochemical transformation in non-aqueous and aqueous phases quickly. To further make the process more specific Design Expert software was used for the optimization of synthesize phenol for maximum % Yield and % Purity. Effect of temperature, Concentration of Catalyst, and Volume of Water was selected as an independent factor to get the maximum % Yield and % Purity of the phenol. The results confirmed the mathematical model robustness and justify experimental design. Therefore, the current protocol for synthesis of phenols from phenylboronic acid is greenest and environmentally benign alternative. The current convention has many benefits, like phenomenal product yields, reduced time of reaction, simple procedure to work up, and extensive substrate scope, cost-effective and also lipase was recuperated and reused multiple times without significant loss of its catalytic activity.

A porous magnetic multifunctional copper-based metal-organic framework (MOF) was developed through combined covalent and dative post-synthetic modification (PSM) of the CuBDC. In this regard, a novel magnetic metal-organic framework (MMOF) consisting of supported 1,10-phenanthroline-2,9-dicarbaldehyde (Fe₃O₄@Cu(BDC)-NH₂-PHD) has been fabricated by post-synthetic modifications of Fe₃O₄@Cu(BDC)-NH₂. Subsequently, the prepared nanocomposites were modified using palladium chloride ions (Fe₃O₄@Cu(BDC)-NH₂-PdPHD) to impart catalytic sites. As a result, the fabricated magnetic porous catalyst exhibited great catalytic activity in Suzuki-Miyaura cross-coupling reactions. Some of the essential advantages of the synthesized catalyst are; high catalytic activity, short reaction times, mild conditions, high thermal stability, and reusability. Moreover, his porous magnetic nanomaterial can be used as a new support to immobilize other metals in different catalytic reactions.

A new organic nonlinear optical single crystal, 1,4-diamino-2,5-dichlorobenzenium picrate (DADCBP) has been successfully grown by solvent slow evaporation method. DADCBP crystallizes in a triclinic structure with the centrosymmetric space setup, P-1. The molecular structure of the grown crystal has been determined by NMR spectral analysis. The existence of discrete functional branches of the crystal has been identified by FTIR spectral study. The optical property of the title crystal has been measured by UV-Vis-NIR spectral analysis. PL spectra reveal the emission bands of the grown crystal. The thermal stability of the harvested crystal has been examined by the TG/DTA study. The dielectric constant and loss have been taken to locate the arrangement of charges in the grown crystal. The quantum chemical studies have been performed to analyze the HOMO/LUMO, molecular geometry, and mulliken atomic charge by B3LYP at the 6-311++G (d,p) level of theory. H···H, O···H, C···H, C···C various intermolecular interactions of hydrogen bonds in the DADCBP molecule have been visualized by the Hirshfeld surface analysis. The nonlinear optical (NLO) characteristics like nonlinear absorption coefficient (β), nonlinear refractive index (n₂) and susceptibility (χ⁽³⁾) have been examined using the Z-scan technique.

In this study, solid-phase microextraction (SPME) fiber adsorbents were coated with the metal-organic framework ZIF-67 and protected by layered double hydroxides (LDH) nanotubes. The findings unequivocally show that the extraction selectivity is dependent on the surface element composition of coatings produced from ZIF-67. The ZIF-67@NiCo-LDHs coating was chosen for the enrichment and detection of polycyclic aromatic hydrocarbons (PAH) in water samples due to its long-term stability and superior extraction selectivity. The calibration curves were dynamically linear and ranged from 0.00 to 100 g L⁻¹ at the optimum circumstances, with correlation values (R²) above 0.996–0.999. LOD values ranged from 0.07 to 0.5 ng L⁻¹. Under ideal circumstances, the test compounds’’ repeatability for one fiber (n = 3), expressed as relative standard deviation (RSD%), ranged between 7.5 and 9.2%. Additionally, the synthetic fiber displayed 40 cycles of extraction and desorption and perfectly controlled development.

Schiff bases with pyrene, anthracene or naphthalene groups can act as simple, sensitive, and selective sensors for the detection of trace explosives. We have prepared three new types of Schiff bases with fluorescent properties as fluorescent probes for use in the fluorescence detection of explosives. The detection properties of the synthesized compounds of photophysical and fluorescent explosives were investigated. Spectroscopic methods were used for the structural characterization of the compounds. Within the scope of the study, compounds (A, B and C) were used as fluorescent probes in the detection of some explosives and the data obtained were recorded. Instead of the quenching effect expected by the explosives on the emissions of the compounds, it was observed in some experiments that the emission intensity due to aggregation increased. In addition, the color measurements (CIE standards) and Color temperature (CCT) of the compounds were calculated.

The geometry optimization, natural bond orbital analysis, and vibrational analysis of Cadmium Nicotinate (CdN) were performed using the density functional B3LYP level with a LANL2DZ basis set. Transfer of electrons from the lone pair oxygen in COO⁻ to the antibonding orbital of the O-H bond results in the formation of hydrogen bonds, which results in the most interesting biological properties, according to natural bond orbital analysis. The red shift in wavenumber has been confirmed by intramolecular O-H…O hydrogen bonding interactions and the water group coordinated to the central metal cadmium via oxygen atoms. UV spectral analysis, on the other hand, reveals the n→π* transition due to its strong peak in absorption spectra, demonstrating its biological activity. The MEP and Fukui Functions are used to represent the molecule’s reactive region, which remains more electrophilic around the oxygen atoms. DOS spectral analysis is used to investigate the molecular orbital contributions. The Electron Localization Function (ELF) and the Local orbital locator (LOL) were used to conduct topological studies on CdN. To investigate distinct covalent and non-covalent interactions, Hirshfeld surface analysis and reduced density gradient analysis were used. Molecular docking studies were used to investigate ligand-protein interactions and ADME parameter analysis and the Lipinski rule for the CdN molecule confirmed that the compound has good drug-like properties and could be developed as an antifungal drug in the future.

Piperine (a naturally occurring alkaloid), is a biologically active natural product belonging to the alkaloid series of compounds. In this study, the spectral characterization of piperine isolated from black pepper has been performed using FT-IR, ¹H-NMR, and ¹³C-NMR. To explain spectral features, we have calculated the vibrational frequencies of the optimized structure of piperine using the B3LYP/6-311 + G(d,p) level of theory and NMR spectra using the GIAO method. All vibrational modes of the title molecule have been assigned based on potential energy distribution. The calculated scaled wavenumbers and NMR chemical shifts show good agreement with the experimental FT-IR and NMR data, respectively. To assess the bioactivity of piperine, we have first performed molecular docking using the ITK receptor and subsequently, the molecular dynamics simulation of the resulting complex for 100 ns. The results suggest the potential of piperine for possible anti-inflammatory action.

Novel benzidine bis azo (BBA) complexes with Fe(III), Co(III), Ni(II), Cu(II), and Zn(II) were created and analyzed using a variety of analytical methods. The B3LYP/6-311G(d,p) and LANL2DZ basis sets were used in quantum chemical simulations with the DFT approach to analyze the structures of the BBA and its complexes. The compounds’ strong NLO properties can be easily polarized, as indicated by the narrow HOMO-LUMO energy gap. The polarizability and hyperpolarizabilities of the chelates indicate that they are good candidates for NLO materials. The electronic spectra were computed using the polarizable continuous solvation method PCM, TD-DFT/PCM. Additionally, the infrared spectra obtained were compared to the anticipated harmonic vibrations of the azo dye ligand and its complexes. Utilizing molecular docking and virtual screening technologies, binding energy studies of the bis azo dye ligand and its complexes with the human coronavirus Nl63 nucleocapsid protein (PDB ID: 5epw) and SARS-CoV spike protein (PDB ID: 5wrg) were anticipated. The results demonstrated promising binding. The outcomes demonstrated the efficiency of the ligand and its complexes as COVID-19 and SARS virus inhibitors. Zn was shown to be the only metal that connected to the 5epw-Viral protein.

In order to create Pyrrolo pyrimidine derivatives, multicomponent reactions involving butanoates, aldehydes, guanidine, activated acetylenic compounds, and ethyl bromopyruvate were carried out in water at room temperature with catalytic amounts of Cu@KF/CP NPs as a high-performance catalyst. Additionally, experiments involving the reducing power of ferric ions and radical trapping by DPPH were conducted to investigate the antioxidant capacity. As a result, the produced compounds exhibit excellent DPPH radical trapping and good ferric ion reduction capacity. The current method offers advantages including good reaction yield, green media, and simple product and catalyst separation.