查找使用阿拉丁产品的科研文献

Homochiral Zn(Ⅱ) coordination polymers with helixes constructed from semirigid lactate deriatives for circular polarization luminescence and fluorescent prober

Zhong-Xuan Xu,Ya-Jia Zheng,Xiao-Ru Liu

In the presence of nitrogen heterocyclic compound 2,5-di(1 H -imidazole-1 -yl)pyridine (2,5-DIP), luminescent chiral synthons ( R )-H 3 CTA and ( S )–H 3 CTA assembled with Zn 2+ ions to obtain enantiomers [Zn(( R )-HCTA) (2,5-DIP)] n ( HU14 -R ) and [Zn(( S )-HCTA) (2,5-DIP)] n ( HU14– S )) under hydrothermal condition, respectively. Partially deprotonated ( R )-HCTA 2- anions were bridged by Zn 2+ ions to form small left-handed ( R )-HCTA-Zn chain in HU14- R , while ( S )-HCTA 2- anions and Zn 2+ ions were connected together resulting in enantiomeric right-handed chain in HU14– S . Moreover, larger left-handed ( R )-HCTA-Zn-2,5-DIP chain and right-handed ( S )-HCTA-Zn-2,5-DIP chain were found in HU14 -R and HU14– S , respectively. These helical building blocks were joined together to create a pair of 3D frameworks with dia net, which show strong fluorescent characteristic and circular dichroism response. Further tests proved that HU14 -R and HU14– S have circularly polarized light (CPL) activity and their luminescence anisotropy factors (g 1um ) at 358 nm are +0.00346 and −0.00157, respectively. Moreover, as fluorescent probes, they have high stability, reliability and interference detection rate, and detection limits are up to 2.80 × 10 −6  M for Cr 2 O 7 2− and 6.19 × 10 −6  M for MnO 4 − .

Syntheses, structures, luminescent and catalytic properties of two 3D metal-organic frameworks

Jun-Xia Xiao,De-Yun Ma

Two new 3D Zn(II)/Pb(II)-based MOFs, {[Zn 9 (mbpdc) 7 (3,3′-dmbpy) 2 ( μ 3 -OH) 4 ]·(H 2 O) 5 } n ( 1 ), and {[Pb 11 (mbpdc) 7 (μ 4 -O) 3 ( μ 3 -OH) 2 ]·(H 2 O)} n ( 2 ) ((H 2 mbpdc = 2-methyl-4,4′-biphenyldicarboxylic acid, 3,3′-dmbpy = 3,3′-dimethyl-4,4′-bipyridine) have been synthesized and were structurally characterized. Complex 1 exhibits 3D network with 10-connected ile topology and is comprised of pentanuclear (Zn 5 N 2 O 18 ) units bridged by mbpdc ligands and further pillared by 3,3′-dmbpy struts. Complex 2 is a new 3D lead(II) MOF constructed by dodecanuclear {Pb 12 (COO) 16 ( μ 3 -OH) 2 ( μ 4 -O) 4 } units and mbpdc ligands. Furthermore, the luminescence and the catalytic activities of 1 – 2 for the degradation of methyl orange in a Fenton-like process have also investigated.

Novel dual-crosslinked antimicrobial hydrogels of oxidized hyaluronic acid/gelatin grafted with curcumin-Zn2+ complexes for preservation of chilled chicken

Xutao Mai,Yuheng Yang,Daoying Wang,Weimin Xu,Zhilan Sun,Fang Liu

To enhance the solubility and stability of curcumin, a novel double-crosslinked antimicrobial hydrogels OHA/GEL/CUR-Zn(II) was prepared. Curcumin, as a ligand, was complexed with Zn 2+ to form a stable complex (CUR-Zn(II)), which was grafted to the hydrogel formed by oxidized hyaluronic acid (OHA) and gelatin (GEL) through Schiff base reaction. Fourier transform infrared spectroscopy analysis was employed to determine the formation of Schiff base (C N) between OHA with GEL, as well as the ester bond between OHA with CUR-Zn(II). X-ray diffraction results showed the presence of amorphous peaks in the composite film. The change in crystal structure was probably due to the formation of new hydrogen bonding or chemical bonding between CUR-Zn(II) and OHA/GEL. The incorporation of CUR-Zn(II) complexes into a hydrogel matrix resulted in a significant enhancement of tensile strength (TS) and elongation at break, accompanied by a reduction in water vapor transmission rate. Meanwhile, the hydrogel achieved a bactericidal rate of over 99 % against the predominant spoilage bacteria Escherichia coli and Staphylococcus aureus in chilled chicken meat, extending the shelf life of the chilled chicken meat to over 8 days. Overall, the composite hydrogel enhanced the stability of curcumin by chelating it with Zn 2+ and increased its solubility by grafting it onto OHA and GEL cross-linked hydrogels, demonstrating significant application potential in food packaging.

Polymer-Zn(II) sunscreens for protection against harmful blue ray

Rui Yuan,Sa Du,Jieyao Cheng,Zeyu Ma,Ruoxi Wang,Xiue Yan,Yonghui Huang,Yuwei Wu,Lei Tao

Harmful blue rays (HBRs, 400-450 nm) originating from the sun and numerous electronic devices are similar to ultraviolet rays (UVRs) and can induce skin photoaging. Ordinary sunscreens exhibit poor HBR-blocking capability, and traditional anti-HBR materials are unsuitable for skin protection. Herein, we develop a polymer-metal complex that can be applied to the skin to effectively block HBRs. Hydroxyquinoline is introduced into the polymer backbone via the Biginelli reaction. This polymer (P) exhibits strong coordination with Zn(II). The resulting P-Zn(II) complex undergoes a spectral redshift through metal-ligand orbital transitions, enabling effective shielding of both UVRs and HBRs. The P-Zn(II) complex protects fibroblasts from HBR-induced cell death, oxidative stress, and cellular aging by preventing HBR-triggered dysregulation of multiple photoaging-related signaling pathways and genes. In mouse experiments, the P-Zn(II) complex exhibits minimal skin irritation and low hepatic and renal toxicity. It can be applied to the skin in a manner similar to sunscreens and effectively prevents HBR-induced skin damage, which fills the gap in HBR protection left by current commercial products. This study highlights the potential of polymer-metal ion complexes as advanced photoprotective materials and provides valuable insights into the development of anti-HBR biomaterials.

Enhanced photolysis of tetracycline by Zn(II): Role of complexation

Chang Xu,Shan Zhao,Shu-Guang Wang,Chao Song

Zn(II) is a necessary additive during antibiotic production and aquaculture, leading to the coexistence of Zn(II) and antibiotics in aquatic environment, especially in receiving waters of pharmaceutical and aquaculture wastewater. However, the roles of Zn(II) in the photochemical behavior of antibiotics are still not clear, which limits the understanding of the fate of antibiotic in nature. In this study, tetracycline (TC) was selected as typical antibiotic to evaluate the effect of Zn(II) on antibiotic photolysis. The removal of TC was accelerated by 22.75 % with TC:Zn(II) molar ratio at 1:5. The mechanism of Zn(II)-induced TC photolysis was explored via reactive oxygen species (ROS) analysis and density functional theory (DFT) calculation for the first time. Zn(II) could enhance the formation of TC excited states and further produce more singlet oxygen (12.54 % higher than control group) to promote indirect photolysis. Besides, Zn(II) could react with TC via complexation, and the complex was more vulnerable to attack by reactive oxygen species due to more active sites. Furthermore, the structure and toxicity of intermediates were identified with mass spectrometer , T.E.S.T. and ECOSAR software. Zn(II) hardly changed the degradation path of TC, and TC was mainly degraded via ring opening, demethylation, deamidation, and hydrogen abstraction with more toxic intermediates than the parent molecule. This work is significant to better understand the environmental fate of antibiotics, and also provides new insight into wastewater treatment in the pharmaceutical and aquaculture industry .

Rapid Electrochemical Sensing of Zn(II) Using MesoporousMnO2@N-Graphene Composites

Xiangle Meng,Xiuxiu Dong,Dong Liu,Qijian Niu,Shun Lu,Tianyan You

Enhanced performance of inverted CsPbBr3 nanocrystal LEDs via Zn(II) doping

Xiaowen Zhou,Yu Zhao,Wenzhe Huang,Yuanyuan Wu,Zhongen Wu,Gufeng He

Perovskite lighting-emitting diodes (PeLEDs) with inverted structure have been considered as promising display technology due to their suitable driving schemes with n-type thin-film transistors. However, the defects and imbalanced charge carriers in the CsPbBr 3 nanocrystal (NC) PeLED are key hurdles, limiting the performance. Herein, we have successfully doped Zn 2+ ions into CsPbBr 3 NCs by ligand-assisted reprecipitation method, exhibiting an 85% enhancement of the photoluminescence quantum yield (PLQY). In addition, the optimized energy level alignment via Zn doping facilitates the carrier balance in the devices, improving the efficiencies. The obtained CsPbBr 3 :Zn-based PeLED reaches a high luminance of 3124 cd/m 2 and a maximum external quantum efficiency (EQE) of 0.85%, which are superior to those of CsPbBr 3 -based PeLED (luminance = 564 cd/m 2 , EQE = 0.09%). The results demonstrate that Zn doping significantly enhances the performance of PeLED, which increases the potential of these inverted PeLEDs connected with n-type TFTs towards practical applications.

Synthesis, characterization, and biological evaluation of a novel Zn(II)-Naproxen complex

Yi-Chun Chu,Tian-Tian Wang,Lin-Jian Wang,Qing-Yang Luo,Ru Jia,Tao-Cheng Hong,Xiao-Ming Wang,Hai-Liang Zhu

A novel Zn(II)-Naproxen complex [Zn(nap) 2 (dap)] containing 1,3-diaminopropane ligand was synthesized and characterized by FT-IR, UV–Vis, elemental analysis and 1 H NMR spectroscopy, its single crystal structure was confirmed by X-ray crystallography. The new Zn(II)-Naproxen complex was evaluated in vivo for its anti-inflammatory, ulcerogenic and analgesic activities, in vitro for antibacterial and antioxidant activities, which showed superior biological properties compared with Naproxen. The edema inhibition rate for the complex reached 57.8% after 3 h, pain inhibition value was 71%, and ulcer index was 8 ± 1. Furthermore, the antibacterial and antioxidant activities of Zn(II)-Naproxen complex were tested showing better effects than Naproxen.

A Pyridyl Zn (II) Chelate for the Sensitive Detection of Aβ Fibrils

Yusi Yao,Wenhui Li,Qiuqin Han,Guanglei Lv,Chunxia Li,Anyang Sun

Amyloid-β (Aβ) fibrils play a pivotal role in driving neuroinflammation and the progression of tau pathology in Alzheimer's disease (AD). In addition, Aβ oligomers are presumed to be closely associated with pathogenesis of AD. Currently, although a few Aβ antibodies are available, fluorescent probes still play an important role in detecting Aβ pathology. Herein, we designed and synthesized a pyridyl zinc chelate KZ and tested its potential specificity to Aβ species. The probe KZ showed a good binding to fibrillar Aβ aggregates and an excellent anti-interference feature in vitro. Importantly, KZ could display a subset of Aβ deposits recognized by OC antibody in brain sections of AD mouse models. Thus, this probe KZ could be used as a sensitive tracer for detecting Aβ fibrils or/and fibrillar oligomers.

A blue fluorescent waterborne polyurethane-based Zn(ii) complex with antibacterial activity

Xiang Luo,Yuqing Yang,Mingdi Yang,Kehua Zhang,Yuxi Xian,Ping Wang,Hongliang Xu,Xianhai Hu

Polymer-based transition metal complexes have attracted much attention in many fields of application. In this article, a fluorescent polymer-based transition metal complex was prepared by bonding the transition metal complex with the polymer. First, Schiff base salicylaldehyde ethanolamine (HL) as a ligand was prepared by the reaction of salicylaldehyde with ethanolamine. Then, salicylaldehyde glycolamine Zn( ii ) transition metal complexes (ZnL 2 ) were synthesized with HL and Zn 2+ as the central ion. Finally, a blue fluorescent waterborne-based polyurethane Zn( ii ) complex (ZnL 2 -WPU) with an antibacterial function was prepared with ZnL 2 as a chain extender by modified acetone method. The characteristics of fluorescence, heat stability, and bacteriostasis were characterized. Compared with ZnL 2 , the UV–vis absorption peak of ZnL 2 -WPU shows a blue shift of about 20 nm. ZnL 2 -WPU has a strong blue fluorescence emission at 450 nm, and the intensity increases significantly with ZnL 2 content. Surprisingly, the fluorescence lifetime of ZnL 2 -WPU is obviously increased, reaching more than one time that of ZnL 2 . Interestingly, the antibacterial efficiency of ZnL 2 -WPU against E. coli reached an incredible 99%. More importantly, ZnL 2 -WPU uses water as the dispersing medium, which is more environmentally friendly.

A novel polymer probe for Zn(II) detection with ratiometric fluorescence signal

Haipeng Diao,Lixia Guo,Wen Liu,Liheng Feng

A conjugated polymer probe comprised of fluorene , quinolone and benzothiazole units was designed and synthesized by the Suzuki coupling reaction. Through the studies of photophysical and thermal properties, the polymer displays blue-emitting feature and good thermal stability. A ratiometric fluorescence signal of the probe for Zn(II) was observed in ethanol with a new emission peak at 555 nm. The probe possesses a high selectivity and sensitivity for Zn(II) during familiar metal ions in ethanol. The detection limit of the probe for Zn (II) is up to 10 −8  mol/L. The electron distributions of the polymer before and after bonding with Zn (II) were investigated by the Gaussian 09 software, which agreed with the experimental results. Noticeably, based on the color property of the probe with Zn(II), a series of color test paper were developed for visual detecting Zn(II) ions. This work helps to provide a platform or pattern for the development of polymer fluorescence probe in the chemosensor field.

Ionothermal synthesis and crystal structure of a luminescent bipyridine bridged Zn(II) complex

Wei Xiong,Wentao Xu,Youfu Zhou,Decai Huang,Jinyun Wang,Maochun Hong,Chunrong Xiong

A luminescent complex, [Bmim] 2 [(ZnBr 3 ) 2 (bpy)] ( 1 ) (bpy   =   4,4′-bipyridine, bmim   =   1-butyl-3-methyl imidazolium), has been synthesized through ionothermal reaction and characterized systematically. Complex 1 exhibits isolated structure of bipyridine bridged zinc bromide units, stacked with 1-butyl-3-methyl imidazolium layers. The luminescent property of 1 has been investigated and supported by density functional theory (DFT) calculations, where the emissions are assigned to the halide-to-ligand charge transfer (XLCT) mixed with some metal-to-ligand charge transfer (MLCT) and intraligand-charge-transfer (ILCT).