BULLETIN OF THE CHEMICAL SOCIETY OF ETHIOPIA
·
2014
·Vol. 28
·期 3
·409-414
·
IF 0.491
G-H. Sheng,Z-L. You,H-L. Zhu
Reaction of [MoO2(acac)2] (where acac = acetylacetonate) with N’-(2-hydroxy-4-diethaylaminobenzylidene)-4-hydroxybenzohydrazide (H2L) in methanol afforded a methanol-coordinated mononuclear molybdenum(VI) oxo complex, [MoO2L(MeOH)]. Crystal and molecular structure of the complex were determined by single crystal X-ray diffraction method. The complex was further characterized by elemental analysis and FT-IR spectra. Single crystal X-ray structural studies indicate that the hydrazone ligand coordinates to the MoO2 core through enolate oxygen, phenolate oxygen and azomethine nitrogen. The Mo atom in the complex is in octahedral coordination. Thermal stability of the complex has also been studied. KEY WORDS: Molybdenum complex, Hydrazone ligand, Crystal structure, X-ray diffraction, Thermal property Bull. Chem. Soc. Ethiop. 2014, 28(3), 409-414.DOI: http://dx.doi.org/10.4314/bcse.v28i3.10
研究领域:
无机化学
·
材料科学
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 3
·1256-1267
·
IF 3.925
Lei Yin,Hui Yang Li,Tingting Ge,Yuchao Li,Cuncun Zuo,Ming Wang,GuangJun Cui,Haofei Huang,Lin Guo
A series of acid–base-loaded γ-Al2O3 catalysts was applied as the catalysts for the isomerization of 3/4-methyl-tetrahydro phthalic anhydride. With a basic metal (K or Na) as the basic source and phosphorus (P) as the acid source, γ-Al2O3 was modified by equal volume immersion. NH3/CO2-TPD, XRD, TEM/EDS, BET, and TGA were used to analyze the catalysts, and 15%-K/Al2O3 and 10%-P/Al2O3 were determined as the most appropriate catalysts. The isomers were qualitatively and quantitatively analyzed using nuclear magnetic resonance (1H-NMR) and infrared spectroscopy (IR), and the reaction mechanism for the isomer formation was proposed. With 3-MTHPA as the substrate, the acid/base reaction temperature was 165/150 °C, the reaction time was 3 h and the amount of the catalyst added was 3%. A new type of continuous isomeric fixed-bed reactor was designed. The stability of the catalyst was tested, and the activity loss was 4.6–6.6% after 10 hours of operation.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 31
·10874-10879
·
IF 4.174
Runqing Liu,Hongping Wu,Hongwei Yu,Zhanggui Hu,Jiyang Wang,Yicheng Wu
Three rare-earth orthoborates Ba2MgY2(BO3)4, Ba2CdY2(BO3)4, and Ba2CdSc(BO3)3 were synthesized via a high-temperature solution method and their structures were determined by single crystal X-ray diffraction for the first time. Ba2MgY2(BO3)4 and Ba2CdY2(BO3)4 are isostructural and both crystallize in the monoclinic crystal system, P21/c, while Ba2CdSc(BO3)3 crystallizes in the triclinic crystal system, P. The structures of Ba2MgY2(BO3)4 and Ba2CdY2(BO3)4 can be described as the three-dimensional (3D) frameworks composed of MO5 (M = Mg, Cd), YOn (n = 6, 7) polyhedra with isolated BO3 and Ba2+ cations residing in the space of the frameworks. The structure of Ba2CdSc(BO3)3 is composed of 2D [CdSc(BO3)3]∞ layers separated by Ba2+ cations. In addition, structural comparisons, thermal behaviors, UV-vis-NIR diffuse reflectance spectra, and infrared spectroscopy results are also reported.
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PubMed
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2019
·Vol. 2019
·期 9
·1212-1219
·
IF 2.578
Xin Yu Deng,Kai Chen,Ming-Dong Chen,Li Bin Lü,Zhu Tao
Graphical The probe responds to Cs + cations in alkali metal systems, Ba 2+ and Sr 2+ cations in alkaline earth metal systems; Eu 3+ , Tm 3+ , and Yb 3+ cations in lanthanide systems, and Cr 3+ , Fe 3+ , and Hg 2+ cations in systems containing transition and other metal cations, by obvious fluorescence quenching. Based on the study of a known host–guest inclusion complex comprising cucurbit[6]uril (Q[6]) and a hemicyanine dye, trans -4-[4-(dimethylamino)styryl]-1-pyridinium iodide ( t -DSMI), a water-soluble symmetric tetramethylcucurbit[6]uril (TMeQ[6]), was selected to construct a t -DSMI-based probe to test the response to various metal cations in neutral water. The experimental results revealed that the probe responded to Cs + cations in alkali metal systems, Ba 2+ and Sr 2+ cations in alkaline earth metal systems, Eu 3+ , Tm 3+ and Yb 3+ cations in lanthanide systems, and Cr 3+ , Fe 3+ and Hg 2+ cations in systems containing transition and other metal cations, via obvious fluorescence quenching.
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ACS Omega
·
2020
·
IF 2.87
Chunmei Xiao,Jianming Lin
The contamination of water systems by heavy metals greatly threatens human health and ecological safety. An efficient adsorbent is critical for the removal of these contaminants. In this work, magnetic Ni3Si2O5(OH)4 nanotubes (NTs) have been synthesized via in situ hydrothermal reduction and further functionalized by grafting poly(4-vinyl pyridine) (P4VP) brushes on its surface via atom transfer radical polymerization. Characterizations by Fourier transform infrared, X-ray diffraction, thermogravimetric analysis, transmission electron microscopy, and X-ray photoelectron spectroscopy proved that P4VP was successfully grafted on the surface of magnetic Ni3Si2O5(OH)4 NTs. The resultant Ni3Si2O5(OH)4-g-P4VP NTs are efficient nanosorbents for removing Cr(VI) anions from water. The Cr(VI) adsorption capacity of Ni3Si2O5(OH)4-g-P4VP NTs reaches 1.49 mmol/g at a pH of 3. The pseudo-second-order kinetic model and the Freundlich isothermal model are suitable to describe the adsorption process. The analysis using Weber–Morris and Boyd models indicates that both intraparticle diffusion and external film diffusion affect the Cr(VI) adsorption process. The adsorption enthalpy is estimated to be 18.37 kJ/mol. More than 90% of the Cr(VI) adsorption capacity of the Ni3Si2O5(OH)4-g-P4VP NTs remains after eight adsorption and desorption cycles.
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高影响因子
Acta Crystallographica Section C-Structural Chemistry
·
2025
·Vol. 81
·期 8
·462-466
·
IF 0.9
Li T.,Fu H.-R.
Exploring blue emission lead-free halides with high photoluminescence quantum yields (PLQYs) is a significant and challenging issue for luminescent materials. Herein, a zero-dimensional (0D) organic–inorganic hybrid halide, namely, bis[4-(4-chlorophenyl)pyridinium] tetrabromidozincate, (C11H9ClN)2[ZnBr4] or [HCPP]2[ZnBr4] [CPP is 4-(4-chlorophenyl)pyridine], was synthesized through acid solution evaporation. The compound crystallizes in the monoclinic space group C2/c. The asymmetric unit consists of a [ZnBr4]2− dianion cluster and two monoprotonated [HCPP]+ cations. The [ZnBr4]2− unit presents an almost undistorted tetrahedral geometry. The [HCPP]+ cations adopt nearly coplanar conformations with small dihedral angles of 5.05 (3)°; there are relatively strong π–π interactions between adjacent [HCPP]+ cations due to slipped parallel packing, with a distance of 3.81 (1) Å. Significantly, this halide exhibits highly efficient blue-light emission (385–500 nm) with a PLQY of 56.35%.
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 316
·期 1
·363-368
·
IF 1.181
Song Hu,Wang Guanquan,Wang Jing,Wang Yunhan,Wei Hongyuan,He Jiaheng,Luo Shunzhong
Porphyrin derivatives are usually used for photodynamic therapy (PDT) and labeled with raidonuclide for radiopharmaceuticals. In this work, 5,10,15,20-tetrakis (4-hydroxyphenyl) porphyrin (TPPOH) and 5,10,15,20-tetrakis (4-aminophenyl) porphyrin (TPPNH 2 ) were labeled by 131 I. 131 I-TPPOH and 131 I-TPPNH 2 were cultured with SMMC-7721 and HL-7702 cells for affinity test. The results show high uptake ratios of SMMC-7721 than HL-7702. 131 I-TPPOH and 131 I-TPPNH 2 were performed radionuclide therapy (RNT) and PDT via tumor in situ injection. At 14 days post injection, the volumes of tumors injected 131 I-TPPOH and 131 I-TPPNH 2 diminished 64 ± 11 and 54 ± 10%, respectively. The therapeutic effect is better than either single PDT or single RNT. The combination therapy of PDT and RNT could be a more effectual method for cancer therapy.
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高影响因子
ACS Omega
·
2018
·
IF 0
Xiao Tian,Li Xia Chen,Yu Qing Yao,Kai Chen,Min-Dong Chen,Xi Zeng,Zhu Tao
Upon mixing of aqueous solutions of the freely soluble building blocks cucurbit[7]uril (Q[7]) and 4-sulfocalix[4]arene (SC[4]A), white microcrystals instantly separate in near-quantitative yield. The driving force for this assembly is suggested to be the outer-surface interaction of the Q[n]. Dynamic light scattering, scanning electron microscopy, and NMR (diffusion-ordered NMR spectroscopy) analyses have confirmed the supramolecular aggregation of Q[7] and SC[4]A. Titration 1H NMR spectroscopy and isothermal titration calorimetry have shown that the interaction ratio of Q[7] and SC[4]A is close to 3:1. Moreover, the Q[7]/SC[4]A-based supramolecular assembly can accommodate molecules of some volatile compounds or luminescent dyes. Thus, this work offers a simple and highly efficient means of preparing adsorbent or solid fluorescent materials.
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PubMed
CHINESE CHEMICAL LETTERS
·
2013
·Vol. 24
·期 12
·1091-1094
·
IF 1.21
Xin-Ping Ouyang,Chun-Lei Liu,Yu-Xia Pang,Xue-Qing Qiu
A trimeric lignin model compound composed of α - O -4 and β - O -4 linkages was prepared by the microwave-assisted synthesis, which consisted of three steps: (a) the synthesis of 3-methoxy-4-benzyloxyacetophenone ( 2 ) from acetovanillone ( 1 ), (b) the bromination of compound 2 to produce 3-methoxy-4-benzyloxy- α -bromoacetophenone ( 3 ), and (c) followed by a nucleophilic substitution of compound ( 3 ) to obtain 3-methoxy-4-benzyloxy- α -(3-methoxy-4-(1-propenyl)phenol)-acetophenone ( 4 ). The target product was characterized by MS, 1 H NMR and 13 C NMR spectroscopy. It was found that the trimeric compound synthesized can be used as a preferable lignin model compound because it contains guaiacyl structural unit (3-methoxy-4-hydroxy phenyl propane) linked by α - O -4 and β - O -4 linkages. In addition, under the conditions of microwave irradiation, the reaction time of each step is significantly reduced, and the selectivity of target product is greatly improved. The yields of each step and the overall sequence are 95.31%, 87.3%, 90.6% and 75.4% (95.31% × 87.3% × 90.6%), respectively.
研究领域:
有机化学
·
高分子化学
·
绿色化学
·
生物质转化
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JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2023
·Vol. 70
·期 4
·848-856
·
IF 1.8
Xiqiang Tian,Yanping Dong,Muhammad Zahid
The excellent photocatalytic hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with NaBH 4 in the aqueous medium is still a big challenge. Herein, we report a facile one-pot evaporation-induced self-assembly (EISA) method to synthesize a series of CuO/TiO 2 nanocomposites. The as-synthesized CuO/TiO 2 photocatalysts exhibit remarkable catalytic activity under direct sunlight in selective hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) due to the synergistic interaction of guest copper nanoparticles with host titanium dioxide (TiO 2 ) species. Especially, 5 wt% CuO/TiO 2 nanocomposite revealed superior reaction rate constant (k) value (0.306 min −1 ) when compared to 3 wt% CuO/TiO 2 (0.192 min −1 ) and 7 wt% CuO/TiO 2 (0.240 min −1 ). Moreover, several characterization techniques (XRD, TEM, N 2 adsorption–desorption isotherm, DRS, and XPS) were executed to deeply investigate the effect of copper content on the bulk and interfacial properties of the catalysts. The characterization results proved that the superior photocatalytic hydrogenation over 5 wt% CuO/TiO 2 catalyst can be ascribed to moderate CuO loading as well as even dispersion of CuO species on the surface of active TiO 2 host, which can largely improve the light absorption ability within visible light region. Besides, the 5 wt% CuO/TiO 2 catalyst exhibits remarkable recyclability and durability, retaining its superior activity (above 95%) up to several repeating cycles, proving its practical applicability for hydrogenation reactions at domestic and industrial levels.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 11
·10651-10659
·
IF 2.195
Huang Xuechen,Liu Bang,Wang Shuanghu,Liu Yuxi,Wu Gang
Bi 2 O 3 - and MgO-doped BaTiO 3 –(Na 1/4 Bi 3/4 )(Mg 1/4 Ti 3/4 )O 3 (BT–NBMT) ceramics were synthesized from a solid-state approach, and then the impacts of Bi 2 O 3 and MgO dosages on the structures and dielectric characteristics were studied. Obvious dual peaks were observed with Bi 2 O 3 dosage to 0.04 and MgO dosage to 0.02. The low-temperature dielectric stability and grain size of the Bi 2 O 3 dopant were improved, while those of the MgO dopant hardly changed with MgO dosage to 0.02, indicating the core/shell microstructure of BT–NBMT was formed following the dissolving-precipitating mechanism of BT systems doped with low-melting-point substances. The low-temperature dielectric stability of the Bi 2 O 3 - or MgO-doped BT–NBMT ceramics first improved and then deteriorated with the increase of doping concentrations. High-temperature stability and diffuse-state transition were found in the optimal ceramics. The second phases of Bi 2 O 3 and MgO, magnesium titanium compounds were observed in Bi 2 O 3 and MgO dopants, respectively. Bi 2 O 3 -doped and MgO-doped ceramics exhibited a fine-grained microstructure and significant grain growth, respectively, and the core/shell microstructure was responsible for the dielectric temperature stability for Bi 2 O 3 dopants and collapsed to a homogeneous one with remarkable grain growth and the second phases for MgO dopants.
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EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
·
2019
·Vol. 121
·期 7
·1900040
·
IF 1.852
Lukai Ma,Guoqin Liu,Xinqi Liu
The formation of three toxic reactive aldehydes, malondialdehyde (MDA), 4-hydroxy-hexenal (HHE), and 4-hydroxy-2-nonenal (HNE), is investigated in five commonly consumed vegetable oils using a method based on the Schaal oven test. HHE is only detected in linseed oil (LO) and rapeseed oil (RO), while MDA and HNE are found to be present in all tested oils. The formation potential of MDA, HHE, and HNE in the tested oils is closely related to the initial polyunsaturated fatty acid (PUFA) content in the oil. Correlation analyses reveal low correlation coefficients for MDA, determining its unsuitability to evaluate the oxidation of oils with low PUFA content, such as palm oil and camellia oil; in contrast, HHE and HNE show sufficient correlations with other oxidation indices in all tested oils. Furthermore, regression analysis indicates that HHE content can predict the oxidation of ω-3 type oil, while HNE content can estimate oxidative deterioration of ω-6 type oils. Particularly, HNE content can also evaluate the oxidation of ω-9 type oils such as PO and CLO with relatively low PUFA level for the high correlations (>0.991, P < 0.01) toward the total oxidation value (TOTOX). Practical Applications : Edible oil consumption continues to increase worldwide. Therefore, it is very important to understand the conditions under which potentially health-damaging compounds are formed in these oils and to develop methods to inhibit their formation or eliminate them from the oils. This study investigates the formation of three toxically reactive aldehydes, namely MDA, HHE, and HNE, through lipid oxidation, specifically PUFA peroxidation. The application of these aldehydes as oxidation indicators for different vegetable oils is also explored. This work could prove beneficial for the quality control of vegetable oils in the edible oil industry. The formation of three toxic aldehydes, MDA, HHE, and HNE in different types of vegetable oils is investigated. Considerable amounts of MDA, HHE, and HNE is found in all the tested oils. The results show the formation of these three aldehydes is competitive. Besides, MDA content is not appropriate to evaluate the oxidation of oils with low PUFA content, such as PO and CLO; while HHE and HNE can characteristically depict the oxidation of ω-3 and ω-6 type oil.
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危险品化学品经营许可证（带存储）