Phosphotungstic acid grafted zeolite imidazolate framework as an effective heterogeneous nanocatalyst for the one‐pot solvent‐free synthesis of 3,4‐dihydropyrimidinones

MXene-encapsulated ZIF-8@Liposomes for NIR-enhanced photothermal therapy in hepatocellular carcinoma treatment: In vitro, in vivo, and in silico study

Photothermal therapy (PTT) utilizes near-infrared (NIR) light to enhance localized, non-invasive cancer treatments and drug delivery systems (DDS). Combination chemotherapy with PTT (chemo-PTT) offers multiple therapeutic advantages, involving synergistic effects, reduced side effects, and decreased drug toxicity. In this study, 2D titanium carbide (Ti3C2Tx) MXene nanosheets were encapsulated in a zeolitic imidazolate framework-8 (ZIF-8) to form (MX-ZIF-8) nanoparticles (NPs) for PTT applications. Sorafenib (SB), an anticancer drug was loaded onto MX-ZIF-8 and further modified with a liposomes (LPs) lipid bilayer to create (SB-MX-ZIF-8@LPs) nanocomposites. TEM imaging revealed that SB-MX-ZIF-8@LPs had a lamellar structure and spherical shape, with an average diameter of 75.2 nm and a zeta potential (ZP) of -8.4 ± 4.5 mV. Additionally, the PT stability, drug encapsulation, and in-vitro release kinetics of SB-MX-ZIF-8@LPs were assessed. These nanocomposites exhibited an impressive PT conversion efficiency of 55 % at 50 μg/mL under NIR irradiation. The cumulative release of SB from SB-MX-ZIF-8@LPs reached 86.15 % at pH 7.4 and 89.3 % at pH 4.8 under NIR over a period of 72 h, with an encapsulation efficiency of 87.34 %. MTT assays revealed strong cytotoxicity against HepG2 cells, with SB-MX-ZIF-8@LPs showing an IC50 value of 2.7 μg/mL and inducing approximately 96 % total apoptosis. The SB-MX-ZIF-8@lip nanocomposite demonstrated excellent biological stability in a serum environment, retaining over 98 % of sorafenib and maintaining consistent particle size (∼347 nm) over 30 days. An in vivo xenograft study in BALB/c mice further demonstrated the efficacy of SB-MX-ZIF-8@LPs, with this treatment group showing the smallest tumor volume compared to other groups and a significantly higher tumor volume reduction than SB alone. Molecular docking studies indicated that SB exhibited strong binding affinities particularly with ABL1 (-8.7 kcal/mol) and EGFR (-9.3 kcal/mol). Docking interactions between MXene and SB, conducted using the Hdock Server, resulted in a docking score of -10.53, with one bond forming at a distance of 4 Å. These findings were consistent with experimental results, highlighting the favorable interaction between MXene and SB. ADMET analysis confirmed that MX-ZIF-8@LPs possessed favorable drug carrier properties, including high intestinal absorption (96.6 %), and low toxicity supporting its potential as an effective DDS for cancer therapy.

Magnetic BiFeO3 nanoparticles: a robust and efficient nanocatalyst for the green one-pot three-component synthesis of highly substituted 3,4-dihydropyrimidine-2(1H)-one/thione derivatives

In this research, magnetic bismuth ferrite nanoparticles (BFO MNPs) were prepared through a convenient method and characterized. The structure and morphological characteristics of the prepared nanomaterial were confirmed through analyses using Fourier-transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), elemental mapping, powder X-ray diffraction (XRD), N2 adsorption-desorption isotherms and vibrating sample magnetometry (VSM) techniques. The obtained magnetic BFO nanomaterial was investigated, as a heterogeneous Lewis acid, in three component synthesis of 3,4-dihydropyrimidin-2 (1H)-ones/thiones (DHPMs/DHPMTs). It was found that the BFO MNPs exhibit remarkable efficacy in the synthesis of various DHPMs as well as their thione analogues. It is noteworthy that this research features low catalyst loading, good to excellent yields, environmentally friendly conditions, short reaction time, simple and straightforward work-up, and the reusability of the catalyst, distinguishing it from other recently reported protocols. Additionally, the structure of the DHPMs/DHPMTs was confirmed through 1H NMR, FTIR, and melting point analyses. This environmentally-benign methodology demonstrates the potential of the catalyst for more sustainable and efficient practices in green chemistry.

ZIF-67 MOF-Derived Mn3O4 @ N-Doped C as a Supercapacitor Electrode in Different Alkaline Media

Transition-metal oxide has been identified as an auspicious material for supercapacitors due to its exceptional capacity. The inadequate electrochemical characteristics, such as prolonged cycle stability, can be ascribed to factors, such as low electrical conductivity, sluggish reaction kinetics, and a deficiency of active sites. The transition-metal oxides derived from the MOF materials offer a larger surface area with enriched active sites and a faster reaction rate along with good electrical conductivity. The manganese (Mn)-based metal-organic framework (MOF)-derived materials were produced using the pyrolysis method. Zeolitic imidazolate frameworks (ZIF-67) were fabricated in water at ambient temperature with the aid of triethylamine. Multiple techniques were used to examine the characteristics of the fabricated electrode materials. The influence of the electrolyte on the electrochemical activity of the Mn3O4@N-doped C electrode materials was determined in KOH, NaOH, and LiOH. For manufacturing of "Mn3O4@N-doped C", ZIF-67 was used as a precursor. The capacitive performance of the Mn3O4@N-doped C electrode increased as a result of nitrogen-doped carbon; after 5000th cycles, the electrode retained an excellent rate capability and a high specific capacitance (Cs) of 980 F g-1 at 1 A g-1 under 2.0 KOH electrolyte in a three electrode system. The carbonized manganese oxide displays also had a high Cs of 686 F g-1 in two electrode systems in 2.0 M KOH. Materials made from MOFs show promise as capacitive materials for applications in energy conversion storage owing to their straightforward synthesis and strong electrochemical performance.

Dual interfacing with metallic cobalt boosts the electron shuttle of CdS-carbide nanoassemblies

Harnessing accelerated interfacial redox, thus boosting charge separation, is of great importance in photocatalytic solar hydrogen generation. In effect, nanoassembling non-noble metallic phases in CdS-based systems and elucidating their role in photocatalysis hold the key to eventually boosting electron shuttle in the field. Here we combine an efficient in-situ exsoluted metallic Co0 nanoparticles on a carbides matrix (CMG) with CdS (CdS@CoCMG) for photogeneration of hydrogen. The metallic cobalt phase exhibits strong binding at the CdS-carbide dual interfaces, forming the accelerated "electron converter" mechanism validated by charge transfer kinetics and achieving two orders of magnitude faster hydrogen production (44.42 mmol g-1 h-1) relative to CdS (0.43 mmol g-1 h-1). We propose that the unique catalyst configuration enable the directional electron-relay photocatalysis via harnessing interfaces between Co0 phase, carbides, and CdS clusters, which eventually boosts the redox process and charge separation of the integrated system, leading to high H2 production rates in the suspension.

Eco-friendly synthesis of chromeno[4,3-b]chromenes with a new photosensitized WO3/ZnO@NH2-EY nanocatalyst

A new heterogeneous photoredox nanocatalyst WO₃/ZnO@NH₂-EY (EY: eosin Y) was fabricated and characterized employing some instrumental techniques such as XRD, FT-IR, ICP, TGA, and SEM. The photocatalytic efficiency of the prepared material was investigated in the preparation of various chromeno[4,3-b]chromenes via a simple and practical method. The chromene derivatives were prepared through the condensation of aromatic aldehydes, dimedone, and coumarin under an open-air atmosphere in the presence of a green LED under solventless conditions. The significant advantages of this new method include low reaction time, easy work-up, cost-effective, wide substrate scope, excellent yield, and complete atom economy of the final products. Moreover, the prepared photocatalyst could be frequently recovered up to four times with only a little decrease in the catalytic activity. Furthermore, the progress of the condensation reaction is demonstrated to occur via a radical mechanism, which shows that reactive species such as ˙O₂⁻ and OH˙ together with h⁺ would be involved in the photocatalytic process. Stability and reusability studies also warranty good reproducibility of the nanocatalyst for at least 4 runs. Eventually, a hot filtration test ensured that the nanohybrid catalyst is stable in the reaction medium and its catalytic activity originates from the whole undecomposed conjugated composite.

WO₃/ZnO@NH₂-EY is disclosed in the preparation of chromenes under air in the presence of a green LED. ˙O₂⁻, OH˙, and h⁺ are proposed as reactive species and hot filtration test assured stability and reusability of the nanocatalyst.

L, Durrani A. Environmentally benign PEG-OSO3H catalysed Ultrasound promoted cascade synthesis of furocoumarins in water

Background:

Green synthesis of furocoumarins in water, PEG-OSO3H used as a recyclable catalyst for the one-pot syntheis in water. avoid used of toxic, lachrymatric and unstablephenacyl bromides instead of that we prepared it in-situ and directly condence with 4-hydroxycoumarins.

Objective:

PEG-OSO3H found to be an efficient and reusable catalyst for the microwave irradiated one-pot synthesis of 3- Aryl-furo[3,2-c]coumarins in PEG-water as a greener reaction medium. This method found to be rapid, simple, ecofriendly and yield obtained relatively higher than other reported methods.

Methods:

Aromatic ketones (5 mmol), NBS (5mmol) was added in solution of PEG-OSO3H (10 mol%) in 10 ml water and irradiated under ultrasound at 80-85°C. then solution of 4-hydroxycoumarin (5 mmol) and solution of acetic acid and ammonium acetate (1 ml) were added into it. Reaction mass was further irradiated for 3 min. The reaction mixture was extracted with ethyl acetate (3 x 10ml) and the combined ethyl acetate phase was concentrated under reduced pressure to obtain corresponding 3-Aryl-furo[3,2-c]coumarins. Aqueous layer was reused for the next reactions.

Results:

It was observed that electrons withdrawing groups (-NO2,-F etc.) on benzene ring of aromatic ketones increases the rate of reactions as well as yield of the products. The IR spectrum of compound 4a showed prominent peaks at 1737cm-1C=O stretching for lactone, 1H NMR of compound 4c showed characteristic singlets for –CH3 of methoxy group of at 3.94 ppm, The above spectral data confirmed the structure of compound. The 13C NMR spectrum of 4b also shows the peaks of CH3, at 23.25 ppm.

Conclusion:

PEG-OSO3H found to be an efficient and reusable catalyst for the microwave irradiated one-pot synthesis of 3-Aryl-furo[3,2-c]coumarins in PEG-water as a greener reaction medium. This method found to be rapid, simple, ecofriendly and yield obtained relatively higher than other reported methods.