JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2015
·Vol. 308
·期 2
·573-578
·
IF 1.034
Xie Zong-Bo,Kang Hai-Tao,Chen Zhong-Sheng,Zhang Sui-Hong,Le Zhang-Gao
The extraction behavior of U(VI) from nitric acid medium by a solution of N , N -dimethyl- N , N -diphenylmalonamide (DMPMA) in the ionic liquid, BmimPF 6 , was studied. The extractability was measured as a function of various parameters such as kinetics, phase ratio, the concentration of DMPMA, nitric acid and sodium nitrate, alkyl chain length of ionic liquid. The extractability from 5 M nitric acid by 0.35 M DMPMA/BmimPF 6 was found to be almost 100 %. Slope analysis of the experimental data suggests that the probable molecular structure of the extraction species is [UO 2 NO 3 (DMPMA) 2 ] + , and the mechanism likely occurs by a cation exchange mode.
研究领域:
化学
·
核化学与放射化学
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DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 15
·2825-2835
·
IF 3.756
Peng Yang,Ian Rosbottom,Zhonghua Li,Vivek Verma,Songgu Wu,Junbo Gong,Jerry Y. Y. Heng
The nucleation experiments of pimelic acid were investigated in the absence and presence of a template. The results show that the template, malonamide, can selectively induce the nucleation of metastable form II of pimelic acid, while only stable form I of pimelic acid crystallizes under blank conditions. Furthermore, the nucleation of pimelic acid induced by a single crystal template was carried out and the induced crystals were characterized by Fourier transform infrared and micro-Raman spectroscopy. The lattice parameters and functional groups of the template and pimelic acid were analyzed, and it is inferred that functional groups play a critical role in the selective nucleation of pimelic acid. In addition, the surface structure of the template crystal was analyzed, and the result shows that the amide groups at both ends of the template molecules are exposed on the (111) and (011) faces, making these faces more likely to induce the nucleation of pimelic acid. The interaction energy, adsorption energy and mean square displacement analysis further verified the induction effect of the template faces on the pimelic acid molecules. The simulation results show that the interaction between the (111)/(011) faces and pimelic acid molecules is obviously stronger than that for other crystal faces. This study investigates the mechanism of heterogeneous nucleation at the molecular level, especially from the perspective of the effective faces, which may provide guidance about the control of polymorphs and selection of templates.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 3
·562
·
IF 3.06
Qi-Bo Li,Min Liao,Qing Liu,Tong Feng,Zhi-Yuan Xu,Chang-Hui Rui,Shang-Zhong Liu
New 1,3,5-trimethylpyrazole-containing malonamide derivatives based on pyflubumide were designed, synthesized, and characterized using1H-NMR,13C-NMR, and high-resolution mass spectra (HRMS). The results of preliminary bioassays showed that the target compounds possessed good activities againstTetranychus cinnabarinus,Plutella xylostella, andAphis craccivora. Most of the target compounds exhibited moderate to good acaricidal activity againstTetranychus cinnabarinusat a concentration of 400 µg/mL, and some showed moderate activity at a concentration of 200 µg/mL; in particular, compounds8mand8pexhibited 70.0% mortality. In addition, some of the target compounds exhibited good insecticidal activities againstPlutella xylostellaat a concentration of 200 µg/mL, especially compounds8iand8o,which achieved 100.0% mortality at a concentration of 100 µg/mL. Interestingly, some of the target compounds exhibited potent anti-aphid activity againstAphis craccivoraat a concentration of 200 µg/mL; furthermore, compounds8pand8qdemonstrated 100.0% anti-aphid activity at a concentration of 50 µg/mL. The preliminary analyses of the structure–activity relationships (SAR) indicated that the acaricidal and insecticidal activities varied significantly depending on the type of substituent and substitution pattern, which provides guidance for the further investigation of such structural modifications.Keywords:malonamide;pyflubumide;synthesis;acaricidal and insecticidal activities
研究领域:
农药化学
·
有机合成
·
植物保护
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产品关联
DOI
PubMed
高影响因子
POLYMER TESTING
·
2020
·
IF 3.275
Guang Li,Bo Jin,Zuohu Chai,Ling Liao,Shijin Chu,Rufang Peng
Nitrocellulose (NC)-based propellants require stabilizers to avoid early decomposition or even explosion during storage. A series of novel fullerene-malonamide derivatives with different carbon chain lengths on the p -position of the benzene ring was synthesized as stabilizers for NC-based propellants through the Bingel reaction because of the excellent thermal stability and strong ability of these derivatives to eliminate free radicals . The molecular structures of these fullerene-malonamide derivatives were verified via 1 H nuclear magnetic resonance (NMR) spectroscopy, 13 C NMR spectroscopy, Fourier-transform infrared (FT-IR) spectroscopy, ultraviolet–visible spectroscopy, and high-resolution mass spectrometry. Meanwhile, their stability was investigated using methyl violet, vacuum stability, and weight loss tests. Results indicated that the stability of the novel fullerene-malonamide derivatives was considerably better than that of traditional stabilizers, such as N,N′ -dimethyl- N,N′ -diphenylurea and diphenylamine . Moreover, these derivatives exhibited excellent thermal stability at high temperatures. The stability of the fullerene-malonamide derivatives also improved as the carbon chain length on the p -position of the benzene ring on C 60 increased. In addition, the stability mechanism of the fullerene-malonamide derivatives was studied through electron paramagnetic resonance spectroscopy , FT-IR spectroscopy, and liquid chromatography-mass spectrometry. Results turned out that the fullerene-malonamide derivatives could react with nitroxide radicals released from the pyrolysis of NC. Hence, these novel fullerene-malonamide derivatives can be used as promising stabilizers for NC-based propellants.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2015
·
IF 3.163
Miao Li,Yao-dong Liang,Xiao-bin Wang,Kan-she Li,Xiang-rong Liu
The complex (LaL 3 ) of lanthanum (III) with N-(2-amino ethyl) maleamic acid radical (L − ) was synthesized and characterized by Fourier infrared spectrum (FT-IR), elemental analysis and melting point measurements. The complex LaL 3 was a chelate, in which lanthanum (III) ion was coordinated with the carboxylate oxygen and amide nitrogen atoms of N-(2-amino ethyl) maleamic acid radical (L − ). The stabilization effect of LaL 3 as a thermal stabilizer on polyvinyl chloride (PVC) was evaluated by static thermal stability test, ultraviolet–visible spectrum (UV–vis), FT-IR and thermogravimetric analysis (TGA). The results showed that the addition of LaL 3 as thermal stabilizer could significantly enhance static stability time of PVC. Compared with the TG of pure PVC and LaL 3 /PVC, within the range of 200–300 °C, the degradation rate of pure PVC was significantly accelerated, whereas the degradation rate of the PVC added LaL 3 stabilizer decreased obviously. The stabilizing efficiency of PVC improved by the addition of LaL 3 is partially attributed by the formation of coordinate bonds between lanthanum (III) and chloride atoms in PVC main chain.
研究领域:
材料化学
·
高分子科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Qi Ren,Hongtao Xia,Yang Wang,Jianqi Lv,Dingzhong Yuan,Yan Liu,Limin Zhou,Yang Li,Yun Wang
Developing the best electrode and exploring its electrosorption process are key to promoting the industrialization of uranium(VI) electrosorption. Herein, malonamide-amidoxime bifunctional polymers (MAFP) was incorporated into graphene oxide/chitosan (GO/CS) to prepare a high-performance composite electrode (MAFP/GO/CS) for U(VI) electrosorption. The as-prepared MAFP/GO/CS electrode displayed a more obvious porous structure, a larger specific surface area, an abundant amide and amidoxime group, as well as better hydrophilicity and electrochemical characteristics. This electrosorption experiment systematically examined the effects of voltage, electrosorption time, pH, and initial U(VI) concentration. According to the results, MAFP/GO/CS electrode had the maximum U(VI) electrosorption capacity of 260.58 mg/g at pH 6 and −1.2 V. It was found that Langmuir’s and pseudo-second-order kinetic models of electrosorption were well suitable for simulating the U(VI) electrosorption kinetics and isotherms. A major contribution to enhanced electrosorptive U(VI) by MAFP/GO/CS electrode could be attributed to the synergetic coordination of U(VI) by amide and amidoxime groups in MAFP moieties. This work served as a good guideline for incorporating MAFP with GO/CS to fabricate a novel electrode for U(VI) electrosorption.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
·
2021
·
IF 4.32
Yang Mu,Fuyin Zhang,Ning Li,Shanshan Pi,Ang Li,Qing Hong,Jian He,Jiguo Qiu,Jiandong Jiang
Dipicolinic acid (DPA) is a widely distributed pyridine derivative containing two carboxylate groups. However, the catabolism of DPA mediated by microorganisms are rarely reported. Alcaligenes faecalis strain JQ135, previously isolated in our lab, was able to degrade various pyridine derivatives, including nicotinic acid (NA). In this study, it was found that strain JQ135 could utilize DPA as the sole carbon and nitrogen source for growth and degrade 1.8 mM (300 mg/L) DPA to a non-detectable level within 12 h. The catabolism of DPA by strain JQ135 extracted two intermediates, i.e., 3-hydroxy-2,6-dipicolinic acid and 4-imino-pent-2-enedioic acid. Moreover, deletion of the key genes essential for NA catabolism (such as moaCDEBmoeA and maiA ) did not affect DPA catabolism, indicating that the maleamate pathway and molybdenum cofactor are not involved in the DPA catabolism by strain JQ135. This study will provide insights into the bacterial catabolism of DPA.
研究领域:
微生物学
·
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）