INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Xiaoqi Liu,Yanyun Zhang,Yan Liu,Ting'an Zhang
In this paper, a novel grafted zeolite/Fe 3 O 4 /chitosan (ZMC-MAH-TEPA) adsorbent was greenly synthesized and evaluated for the removal of Cr(VI) and Ag(I) in single and bi-component solutions. The characterization data of XRF , XRD, FT-IR, VSM, TGA , BET and SEM showed the successful fabrication of the adsorbent with abundant -NH 2 and -NH- as well as great recovery properties (11.70 emu/g). The effects of experimental parameters, including pH value, initial concentration, temperature, time, and coexisting ions on single and bi-component adsorption, were investigated. The results demonstrated that the adsorption capacities increased with the enhanced shaking time and concentration until equilibrium was reached. The optimum pH value was 3 for Cr(VI) adsorption and 5 for Ag(I) adsorption. The maximum adsorption capacities for Cr(VI) and Ag(I) ions, obtained by the Langmuir model, were 50.75 and 70.12 mg·g −1 in single metal solutions and 45.45 and 58.94 mg·g −1 in bi-component metal solutions (Cr(VI)/Ag(I) = 1:1), respectively. Additionally, the adsorption mechanism of Cr(VI) and Ag(I) was explained in terms of electrostatic interaction and hydrogen bonding between metal ions and -NH 2 and -NH- in ZMC-MAH-TEPA. Taken together, this study provides a clean approach to synthesizing chitosan-based adsorbents for the efficient removal of Cr(VI) and Ag(I) ions.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SYNTHETIC METALS
·
2015
·
IF 2.252
Jie Zhao,Yu Xie,Dongsheng Hu,Dongsheng Guan,Junhong Chen,Jian Yu,Shuai He,Ying Lü,Huilong Liu,Shaokui Bao,Lei Wang
The graphene (GN)/phenylenediamine–benzaldehyde (PD–BD) Schiff base Ag(I) complexes were synthesized by the Schiff-base reaction. The morphology and phase structure of the samples were characterized by electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction techniques. Their conductive properties were measured by a four-probe conductivity tester at room temperature. And their magnetic properties were tested by a vibrating sample magnetometer. These results show that the PD–BD Schiff base Ag(I) complexes are chemically bonded onto the GN framework to form an intercalated structure. The conductivity, saturation magnetization, residual magnetization and coercive force of the final complex are found to be 5.07 S cm −1 , 2.93 emu g −1 , 0.69 emu g −1 and 104.68 Oe, respectively. Finally, a possible formation and magnetic mechanism of the composites has also been proposed.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Chao-Ying Gao,Lin Ding,Yang Li,Ning Xu,Yakun Wu,Wenbo Wang,Jinghai Liu,Yang Yang
In the era of global warming, the conversion of carbon dioxide into high-value products has become a widely scrutinized emerging mitigation strategy. Metalation of bpy-containing MOF-253 led to the synthesis of MOF-253–0.5Ag, which acts as an efficient catalyst for the carbonylative cyclization of CO2 with alkyne molecules (such as propynyl alcohols and propynyl amines) at room temperature and ambient CO2 pressure, yielding the corresponding α-alkyl cyclic carbonates and oxazolidinones, thus endowing the catalytic system with bifunctional characteristics. Additionally, the MOF-253–0.5Ag catalyst demonstrated stability, high activity, and recyclability. The mechanisms were further elucidated through experimental results and NMR analysis, demonstrating that Ag(I) can effectively activate the C≡C bonds and hydroxy/amino groups of the substrates.
研究领域:
材料化学
·
环境科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
POLYHEDRON
·
2014
·
IF 2.047
Xue-Jie Tan,Hai-Zhen Liu,Chong-Zhao Ye,Jian-Fang Lou,Yun Liu,Dian-Xiang Xing,Sen-Peng Li,Shu-Lian Liu,Lai-Zhou Song
Two new ethylenediamine Schiff bases of 2-acetylthiazole and 2-acetylpyrazine (abbreviated as Th-Th and Py-Py respectively), as well as their silver(I) complexes [Ag(Th-Th)] 2 ·2(NO 3 ) and [Ag(Py-Py)] 2 ·2(NO 3 ) , have been prepared and characterized by a variety of physico-chemical techniques including elemental analyses, m.p., 1 H NMR, 13 C NMR, ESI-QTOF-MS, FT/IR, UV–Vis and theoretical calculations including density functional theory (DFT) and time dependent density functional theory (TD-DFT) methods. All structures were solved from single crystal X-ray diffraction (SXRD) data, except [Ag(Py-Py)] 2 ·2(NO 3 ) , whose crystal is not good enough for SXRD. Hence, conventional powder X-ray diffraction (PXRD) has to be used. As a first step, the stoichiometric formula of [Ag(Py-Py)] 2 ·2(NO 3 ) was ascertained by elemental analyses and ESI-QTOF-MS. IR and UV–Vis indicated the existence of coordinated Py-Py and charge-balancing NO 3 - . On the basis of symmetry character proved by NMR, three possible symmetrical Ag(I) coordination structures were designed and optimized by DFT method. Then, relative binding free energies were calculated to find the most appropriate molecule structure. DFT results suggest that four imine-N and four ortho-ring-N atoms from two Py-Py ligands are coordinated to two Ag(I) ions, resulting in a similar dimer structure as that of [Ag(Th-Th)] 2 ·2(NO 3 ) . The molecule structure was further confirmed by PXRD based crystal structure, which was solved following direct space method and refined by the Rietveld method. The antitumor activities of the Schiff bases and their silver(I) complexes have been evaluated against human lung cancer cell line A549. Both silver(I) complexes were found to display cytotoxicity (IC 50 = 3.15 ± 0.5 and 9.73 ± 1.1 μM) that is similar to or better than that of cisplatin, while metal-free Schiff bases show very low activity.
研究领域:
无机化学
·
生物化学
·
药物化学
✓ 已验证
DOI
高影响因子
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2020
·
IF 0.512
Chanchan Xu,Lu Lu,Le Lv,Jiandong Guo,Chaoyun Luo,Dawei Luo,Wei Liu
A new zero-dimensional (0D) silver (I) chloride based coordination complex 0 D-Ag2Cl2(L) (1, L = (oxybis(2,1-phenylene))bis(diphenylphosphine)) has been prepared by mixing the silver(I) salt and a bidentate P-ligand at room temperature in solution. 1exhibits a band gap of 3.5 eV and a decomposition temperature (Td) of 280 °C. Such a high Td for molecular complex is a result of the strong Ag-P bonding and the “chelating effect” of the metal of the bidentate P-ligand. It has been used as an efficient photocatalyst for the degradation of organic dyes in water.
研究领域:
材料化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2023
·
IF 2.3
Yi-Fan Tan,Guang-Min Liang,Kun Zhou,Jiu-Yu Ji,Li-Ping Zhao
A new three-dimensional (3D) supramolecular compound, [Ag(dppe)(CF 3 COO)] n ( 1 ), was prepared by using Ag(I) as the silver source and dppe as the organic ligand through the self-assembly approach. The bridging dppe ligand makes compound 1 appear as a one-dimensional (1D) wavy chain consolidated by the intramolecular hydrogen bonds. Two adjacent 1D chains are expanded to a two-dimensional (2D) layer passing through the intermolecular C H···π interaction between the dppe ligands, and the 2D layers further weave into a 3D supramolecular structure via another intermolecular C H···π interactions between the dppe ligands. The precise structure of 1 was determined by single crystal X-ray diffractometer (SCXRD), and it was well-characterized by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) spectroscopy, powder X-ray diffraction (PXRD), thermogravimetric analysis (TG) and differential thermogravimetry analysis (DTG), and UV–vis diffuse reflectance spectrum. In addition, the photocurrent response, electrochemistry characteristic and photodegradation of 1 were investigated. The degradation efficiency (82 %) of 1 as catalyst to degrade methylene blue (MB) was significantly higher than that without catalyst.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2022
·
IF 3.118
Xin Yan,Jia-Qian Chen,Mao-Lin Hu,Hiroshi Sakiyama,Mohd. Muddassir,Jian-Qiang Liu
Two different silver(I) complexes with diphenylphosphonic acid as peripheral ligand were designed and synthesized by using different solvents. The complexes were characterized by X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (IR), elemental analysis (EA), thermogravimetric analysis (TG). Single crystal X-ray analysis established the final structure of both complexes. The interaction modes of the two clusters with DNA were investigated by fluorescence and electrochemical analysis. The theoretical result was justified with the help of theoretical data. The results established that the cluster with methanol solvent was more stable binding with the DNA and protein than the cluster with DMF molecule.
研究领域:
生物无机化学
·
配位化学
·
生物物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
·
2015
·
IF 2.012
Xi-He Huang,Zu-Ping Xiao,Feng-Lan Wang,Ting Li,Meng Wen,Shu-Ting Wu
Two silver(I) compounds, [Ag(H2mbpz)(Hchda)]n (1) and [Ag2(H2mbpz)2(oba)]n (2) (where H2mbpz = 3,3′,5,5′-tetramethyl-4,4′-bipyrazole, H2chda = trans-cyclohexane-dicarboxylic acid and H2oba = 4,4′-oxy-bis-benzoic acid), have been synthesized and characterized by single-crystal X-ray diffraction analyses. In both cases, the Ag(I) centers are linked by H2mbpz ligands to form 1-D Ag(I)-H2mbpz chains; then, the Ag(I)-H2mbpz chains connect with two neighboring congeners through Ag⋯Ag interactions, forming 2-D supramolecular layers. In 1, the dicarboxylate is monodeprotonated and linked to form an anion chain through strong hydrogen bonding interaction. Such anion chains attach on two sides of the supramolecular layers via Ag–O bonds to form a neutral sandwich-like layered network. In 2, the dicarboxylate is fully deprotonated and adopts a μ2-η1:η1 mode to link two adjacent supramolecular layers to form a twofold interpenetrating 3-D supramolecular network. The thermal stability and luminescence of 1 were also studied.
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 12
·e5978
·
IF 3.14
Ying Hou,Yinxu Pan,Chunhong Dong,Bei Nie
We observed the unusual crystal transformation from solid AgNO 3 to Ag(I)-encapsulated fullerene (C 60 ) microcrystal by a coordination-driven crystallization, when casting C 60 solution on AgNO 3 crystal. The strong binding of Ag + -C 60 ruptures electrostatic interactions within AgNO 3 lattice, forming a binary hybrid material, which was characterized by XRD, Raman spectroscopy and mass spectrometry. Our results support the fact that AgNO 3 crystal can directly interact with fullerene C 60 molecules, other than through solvated metal cations. Two major factors, namely sturdy Ag + -olefin interaction and an enclosed cage effect play the dominating roles in crystal transformation. Adding to the regular solution-based crystallization, this facial protocol is expected to render an additional dimension in fabrication of exohedral metallofullerene architecture, regardless of solubility of metal cation in anti-solvent.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
POLYHEDRON
·
2017
·
IF 1.926
Ling-Dong Chen,Lin-Xia Zhou,Yue-Qing Zheng,Hong-Lin Zhu
Two new supramolecular complexes [Ag 2 (MA) 2 (2-nbd)]·2.5H 2 O ( 1 ) and [Ag 2 (MA) 2 (3-npa)]·2H 2 O ( 2 ) (2-H 2 nbd = 2-nitroterephthalic acid; MA = melamine; 3-H 2 npa = 3-nitrophthalic acid) have been synthesized under ultrasound conditions and characterized by infrared spectra (IR), thermogravimetric analysis (TGA), elemental analyses (EA) and X-ray diffraction (XRD). Complex 1 exhibits 2D framework through the bridging of carboxylic acid ligand and melamine ligand. Complex 2 presents a binuclear silver structural unit, which was further construct to three-dimension structure via hydrogen-bond interaction. The photocatalytic performance and photoluminescent properties of them were also investigated. And the results show that complex 1 and 2 exhibited good photocatalytic activity towards the degradation of Rhodamine B (RhB) and Methylene Blue (MB) under visible light irradiation. Moreover, it is verified that the degradation rate fits the first-order kinetics.
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SYNLETT
·
2021
·Vol. 32
·期 14
·1437-1446
·
IF 2.454
Haifei Wang,Chuliang Gong,Chen Zhang,Xiaojun Zheng,Qinglin Hou,Qingxia Zhou,Guiyin Zhou,Yao Chen
In this work, we introduced a multifunctional Ag(I)/CAAA-amidphos complex catalyzed asymmetric 1,3-dipolar cycloaddition of acrylates with α-imino esters, affording a series of 2,4,5-trisubstituted endo-pyrrolidines in good yields (up to 97%) with high enantioselectivities (up to 98% ee). Meanwhile, the catalytic system was also applied in the three-component one-pot reaction of α-imino esters formed in situ under the action of N,N′-diisopropylcarbodiimide. In addition, the gram-scale reaction was realized for the formal synthesis of (+)-ibophyllidine in eight steps.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 9
·3325-3332
·
IF 4.58
Ji Danyang,Meng Hongmin,Ge Jia,Zhang Lin,Wang Hongqi,Bai Dongmei,Li Jianjun,Qu Lingbo,Li Zhaohui
The authors describe a silver(I) mediated fluorescent assay for glutathione (GSH). An allosteric oligonucleotide strand containing a G-rich sequence is used to produce a G-quadruplex, and N-methylmesoporphyrin IX (NMM) is chosen as the fluorescent probe. In the absence of Ag(I), the DNA strand is partially intramolecularly hybridized to form a hairpin structure wherein the G-rich sequence is partially caged. On addition of Ag(I), the hairpin is disrupted by forming C-Ag(I)-C base pairs. As a result, the G-rich sequence is released and folds into a G-quadruplex structure, which is able to bind NMM to generate strong fluorescence at 612 nm. However, in the presence of GSH, due to the strong binding ability between GSH and Ag(I), the C-Ag(I)-C structure is not formed. Hence, the DNA probe reverts back to its original structure and fluorescence is not increased. Based on these findings, a method was worked out that has a detection limit as low as 3.5 nM. Due to the inherent selectivity of the interaction between GSH and Ag(I), the method is highly selective over common potential interfering species. It was successfully applied to the fluorometric determination of GSH in cell extracts.
Schematic of a highly sensitive fluorometric glutathione (GSH) assay based on a conformational switch of a G-quadruplex mediated by silver(I) and N-methylmesoporphyrin IX (NMM) as a signal reporter.
研究领域:
分析化学
·
生物化学
·
分子生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）