Applied Organometallic Chemistry最新文献

Cu NPs are utilized in medicine to improve the central nervous system's physiological function. In addition, green tea is a neuroprotective ingredient in several traditional medications. As a novel neuroprotective supplement, we chose to create Cu NPs in an aqueous medium with green tea leaf extract in the most recent work. Cu NPs were characterized using the standard characterization procedures, which include FE-SEM, EDX, XRD, and FTIR spectroscopy. The creation of Cu NPs is approved by the presence of signals in the EDX diagram for C Lα, O Lα, and Cu Lα. The size range of the produced Cu NPs was usually 10–30 nm. The nanoparticles showed crystalline shape and homogeneity. The hydrogen-bonded phenolic O-H group stretching vibrations are related to a wide peak seen at 3422 cm⁻¹. The trypan blue test was applied to determine PC12 cell viability in the biological portion of the current investigation. Rhodamine123 fluorescent dye was applied to examine the MMP, and the caspase activity colorimetric test kit was used to measure caspase-3 activity. Apoptosis and DNA fragmentation were demonstrated using terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay. The inflammatory cytokines concentrations were measured using the ELISA. Additionally, in the high concentration of nicotine-treated PC12, Cu NPs-treated cell cutlers dramatically (p ≤ 0.01) increased the MMP and cell survival while lowering the levels of DNA fragmentation. Our study's key conclusion showed that green tea-containing copper nanoparticles inhibited the cell death caused by nicotine in PC12 neuron-like cells. According to the clinical trial, Cu NPs may be used as a neuroprotective supplement to treat illnesses of the central nervous system.

A series of diruthenium(I) aminocarbyne complexes of general formula [Ru₂Cp₂(CO)(L)(μ-CO){μ-CNMe (Cy)}]⁺ (L = NH₃, [2]⁺; Py, [3]⁺, PPh₃, [4]⁺; DMSO, [5]⁺; thiourea, [6]⁺) and [Ru₂Cp₂(μ-H)(CO)₂{μ-CNMe (Cy)}], 7, were prepared from the tricarbonyl precursor [Ru₂Cp₂(CO)₂(μ-CO){μ-CNMe (Cy)}]⁺. The reactivity of the diruthenium(I) vinyliminium complex [Ru₂Cp₂(CO)(μ-CO){μ-η¹:η³-C (Ph)CHCNMe (Cy)}]⁺, was also investigated, providing access to piano stool Ru (II) cyclopentadienyl complexes with a five-membered metallacyclic ligand containing sulfur. The new compounds were characterized by IR and multinuclear NMR spectroscopy and X-ray diffraction (in three cases). The solubility in water, lipophilicity, and the speciation of [2–6]CF₃SO₃ in water/DMSO and cell culture medium are regulated by different monodentate ligands. Subsequently, [1,3–6]⁺ were tested in vitro against human ovarian cancer cells (A2780 and A2780cis) and embryonic kidney cells (HEK293), demonstrating moderate to potent cytotoxicity.

Herein, Three Salamo-type Zn (II) complexes [Zn₂(L)(μ-OAc)]·CH₃OH (1), [Zn₄(L)₂]Cl₂ (2), [Zn₄(L)₂](NO₃)₂ (3) is synthesized as the fluorescence probe for ultrasensitive detection of MnO₄⁻ in aqueous solution. The structure analysis shows that complex 1 is a binuclear structure, while complexes 2 and 3 is a symmetric tetranuclear structure. Three complexes exhibited high stability of fluorescence intensity in aqueous solvent. The detection limit is 8.8, 12.8 and 13.8 μM. The anions involved in coordination in complex 1 undergo structural changes due to their different coordination modes compared with complexes 2 and 3, resulting in better detection performance than the other two complexes. Zn (II) complexes have good selectivity and applicability for the determination of MnO₄⁻ in aqueous solutions. At the same time, the sensing effect in the real water samples was also detected. In addition, the fluorescence recognition mechanisms of three complexes for the detection of the above analytes were explored in detail.

A novel and efficient strategy for dye adsorption is provided by unlocking the temperature-dependent breathing behaviour of aluminium-based metal–organic frameworks (Al-MOF). Distinct from conventional MOF adsorption studies, this research uniquely elucidates the dynamic structural adaptations of Al-MOFs that enable the accommodation of large dye molecules, specifically Congo red (CR). Hydrothermally synthesised Al-MOFs—extensively characterised to confirm exceptional crystallinity, high porosity (BET surface area of 173 m² g⁻¹), and thermal stability—exhibit a remarkable temperature-responsive ‘breathing’ mechanism. Elevated temperatures induce reversible phase transitions from narrow to large pores, resulting in a significant expansion of pore volume that dramatically enhances CR adsorption, achieving a maximum capacity of 223.8 mg g⁻¹. The adsorption behaviour conforms to the Langmuir model (R² > 0.990) and follows pseudo–second-order kinetics (R² = 0.993), confirming homogeneous chemisorption. Thermodynamic analysis indicates that the adsorption process is both spontaneous (ΔG° < 0 at ≥ 303 K) and endothermic (ΔH° = +82.06 kJ mol⁻¹, ΔS° = +271.7 J mol⁻¹ K⁻¹), further substantiating the role of the breathing mechanism. Importantly, the Al-MOF demonstrates outstanding reusability, retaining over 90% adsorption efficiency after five cycles. These findings firmly establish temperature-responsive breathing Al-MOFs as transformative, thermodynamically favourable, and highly reusable adsorbents, offering a promising solution for the advanced environmental remediation of hazardous dye pollutants.

This research introduces a simple method for sequential modification of ferrite nanoparticles. A novel, reusable, and green nanomagnetic heterogeneous catalyst was synthesized by immobilizing copper onto Fe₃O₄@THAM@PCH. Finally, it was used as a powerful and new catalyst in the synthesis of derivatives 2-amino-3-cyanopyridine and pyrano[2,3-d] pyrimidine. In the fabrication of Fe₃O₄@THAM@PCH-CuⅡ magnetic nanoparticles, the incorporation of tris (hydroxymethyl)aminomethane (THAM) demonstrated its efficacy as a cost-effective and easily accessible coating for Fe₃O₄ in comparison to materials previously documented in the literature. The catalyst underwent comprehensive characterization through energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared (FT-IR), vibrating sample magnetometer (VSM), X-ray diffraction (XRD), transmission electron microscopy (TEM), inductively coupled plasma (ICP), field emission scanning electron microscopy (FE-SEM), thermogravimetric (TGA), and map analysis. The present method, known as the green method, has advantages such as a simple operational approach, high product efficiency, mild reaction conditions, minimal chemical side products, and short reaction time. The synthesized nanocatalyst can be recycled up to 5 steps without a noticeable decrease in its activity.

In this research, GO/Ni/Y-MOFs were successfully prepared using a microwave-assisted ball milling (MABM) technique. 1,3,5-Benzenetricarboxylic acid was utilized as the organic linker, while nickel(II) acetate tetrahydrate and yttrium(III) acetate hydrate acted as the metal sources. The structural and morphological properties of the synthesized materials were examined using Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and nitrogen adsorption–desorption measurements. These materials were subsequently employed to evaluate their efficiency in removing tetracycline hydrochloride from solution. Experimental findings revealed that adding 200 mg of GO/Ni/Y-MOFs to a solution with an initial concentration of 50 mg/L tetracycline hydrochloride resulted in a remarkable removal efficiency of 87.3% within 2 h. To better understand the kinetic behavior of this process, both pseudo-first-order and pseudo-second-order kinetic models were investigated. It was observed that the experimental data correlated more closely with the pseudo-second-order model predictions. Furthermore, Langmuir, and Freundlich isotherm models were applied to analyze the adsorption characteristics under isothermal conditions. Notably, the experimental results showed a better fit with the Freundlich isotherm compared with the Langmuir isotherm. Based on these experiments, it was concluded that GO/Ni/Y-MOFs exhibit a maximum adsorption capacity for tetracycline hydrochloride at pH 8, reaching up to 375.8 mg/g within 5 h. Overall, our results demonstrate that GO/Ni/Y-MOFs are highly effective for the removal of tetracycline hydrochloride, both theoretically and experimentally.

The multiple metal sulfides with closely contacted interface demonstrate superior photocatalytic activity due to the efficient charge transfer, excellent visible light response ability, and the ideal photocatalytic stability. In this paper, a ternary metal–organic frameworks (MOFs) (ZIF-8@MIL-68(In)@Ag-MOF) was designed as the precursor to precisely construct the multiple metal sulfides of Ag₂S/ZnS/ZIS/In₂S₃ through an in situ one-step sulfurization strategy. The sulfurization process was controlled to preserve the three-dimensional porous architecture of MIL-68(In), and the hollow hierarchical tubes were readily produced due to the sulfurization occurred inner and outer ternary MOFs simultaneously. In the process, the In₂S₃ was generated; firstly, then, the ZnS and Ag₂S was formed; meanwhile, the ZnIn₂S₄ (ZIS) was readily produced at the interface of ZnS and In₂S₃ because of the naturally metal ions exchange. The as-synthesized multiple metal sulfides (named as Z@M@A-t, where t represents the sulfurization time) were used in visible light–induced photocatalytic hydrogen generation. It is shown that the best hydrogen evolution rate is 794.83 μmol g⁻¹ h⁻¹ by Z@M@A-24, which values are evidently higher than that of the ternary MOF precursor. The electrochemical analyses were conducted to clarify the charge transfer route and the enhanced photocatalytic mechanism. It is proven that the closely contacted junction works well in the interface electron transfer. And, the good reusability of Z@M@A-24 heterostructure was also presented. The work highlights the prospect applications of multi-MOF-derived heterostructure for efficient hydrogen production under visible light irradiation.

Two new mononuclear heteroleptic complexes (a) Cu (II) complex using 3,5-dihydroxybenzoic acid and tetramethylethylenediamine and (b) Ni (II) complex with benzoic acid and tetramethylethylenediamine were synthesized and characterized spectroscopically. Moreover, the compounds were characterized by single-crystal X-ray diffraction (SC-XRD), which showed that the benzoate group chelated the metal center in the Cu (II) complex, whereas the non-chelating response of the benzoate group was observed in the Ni (II) complex. A disordered octahedron geometry was found in both complexes according to SC-XRD results. Furthermore, the supramolecular assembly was investigated by Hirshfeld surface analysis. DFT analysis was employed to investigate the electronic characteristics, assess charge transfer processes and examine the NLO properties of the synthesized Cu (II) and Ni (II) complexes. A band gap of 5.083 and 5.116 eV was observed for complexes of copper and nickel, respectively. The global reactivity results indicated that all complexes exhibited positive electron affinity values, implying their participation in charge transfer reactions. Notably, complex Cu (II) was identified as more reactive, while complex Ni (II) was found to be more stable. Both complexes showed absorption peaks in the UV region of the spectrum. Remarkably, the obtained compound Cu (II) demonstrated exceptional NLO characteristics, with a maximum linear polarizability <α> of 4.312 × 10⁻²³ esu and a second hyperpolarizability (γ_total) of 2.482 × 10⁻³⁵ a.u. when in an acetonitrile solution. These synthesized chromophores displayed remarkable NLO properties, primarily attributed to their reduced charge transport resistance. The findings from this NLO study could pave the way for researchers to explore novel NLO materials that hold promise for cutting-edge applications in the modern era.