INORGANICA CHIMICA ACTA
·
2026
·
IF 3.3
Jia-Qi Shang,Wenya Jiang,Jingzhe Li,Yimin Wang,ShuaiQi Wang,Kuan-Guan Liu
Two distinct compounds containing the identical new Ag(II) complex cation ([Ag(cyclam)(MeCN)₂] 2+ ) (paired with PF₆ − and OTf − counteranions, respectively) were prepared via reaction of the macrocyclic ligand cyclam (1,4,8,11-tetraazacyclotetradecane) with non-explosive Ag(I) salts (AgPF₆, AgOTf) under ambient room-temperature conditions, with isolated yields of 33% and 31%. Single-crystal X-ray diffraction, electron paramagnetic resonance (EPR, g-tensor = 2.04 in solid state, 2.03 in low-temperature solution), X-ray photoelectron spectroscopy, and mass spectrometry confirmed the formation and stabilization of the Ag(II) center in both compounds. The two compounds exhibit high stability in solid and solution phases and favorable photothermal conversion performance, achieving conversion efficiencies of 50% ([Ag(Cyclam)(MeCN) 2 ](PF 6 ) 2 ) and 74% ([Ag(Cyclam)(MeCN) 2 ](OTf) 2 ).
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MOLECULES
·
2023
·Vol. 28
·期 4
·1930
·
IF 4.6
Yanqi Ban,Hui Wang,Zixuan Xiao,Lishui Sun,Qingyan Pan,Yingjie Zhao
A carbon–carbon-linked, ultrathin, two-dimensional (2D) polymer film was prepared at the air/water interface through photochemically triggered [2 + 2] cycloaddition. The preorganization of the monomers on the water surface and the subsequent photo-polymerization led to the successful preparation of the ultrathin 2D polymer film. The obtained film is continuous, free standing, and has a large area (over 50 μm2). Transmission electron microscopy (TEM) and atomic force microscopy (AFM) give clear evidence of the ultrathin film morphology. Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) indicate successful photo-induced [2 + 2] polymerization.Keywords:two-dimensional polymers;covalent organic frameworks;porous materials;interfacial synthesis;[2 + 2] cycloaddition;photochemistry
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2014
·
IF 2.045
Chao Guo,Shaoyun Chen,Yongchun Zhang,Guangbo Wang
A mixture of 2-(2-aminoethylamine)ethanol (AEEA) with benzyl alcohol (BP) as absorbent was developed to reduce energy consumption in an amine-based CO2 capture process. The solubility of CO2 in the AEEA + BP solution was compared with AEEA + diethylene glycol (DEG), AEEA + triethylene glycol (TEG), and AEEA + H2O. The CO2 loading (mol CO2/kg amine) at the same CO2 partial pressure was in the order AEEA + H2O > AEEA + BP > AEEA + TEG > AEEA + DEG, and CO2 loading of all these solutions increased with increasing vapor pressure of CO2. Besides, the CO2 loading in AEEA + BP solution significantly decreased with increasing reaction temperature. The desorption rate of AEEA + BP solution was about 1.3 times faster than that of aqueous AEEA solution at the same desorption temperature, and AEEA + BP solution needed 30% time less than AEEA + H2O solution to reach reaction end point. The AEEA + BP solution showed stable repeatability in four cycles of absorption–desorption tests.
研究领域:
化学工程
·
碳捕集与封存
·
温室气体减排
·
分离过程
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 9
·49925
·
IF 2.52
Lei Ding,Yi Fan Chen,Zhengxiang Zhong,Fei Lu,Yunzhe Du,Li Liu,Yudong Huang
Polymers with high flexibility and high content renewable biomass materials have attracted particular attention. Plant-derived trans-cinnamic acid (CA) was introduced into the structure of epoxidized soybean oil to form trans-cinnamated epoxidized soybean oil (ESOCA). ESOCA with multi-cinnamate groups was cured via [2 + 2] cycloaddition photo-polymerization that with no need of photoinitiator, while acrylated epoxidized soybean oil (ESOAA) was photocured via free radical photopolymerization for comparison. The successful synthesis of ESOCA and ESOAA resin was proved by Fourier transform infrared, proton nuclear magnetic resonance, and gel permeation chromatography results. ESOCA is more environmentally friendly than ESOAA for that trans-CA volatility is much lower than acrylic acid during synthesis process. Notably, UV-cured ESOCA samples had a higher tensile strength at break and a 14.75 times elongation at break of that of UV-cured ESOAA samples, showing that [2 + 2] cycloaddition photo-polymerization is a good strategy to prepare flexible materials. Performances of ESOCA as coating on flexible PET film were also better than those of ESOAA, especially the flexibility, adhesion, and UV shielding performance. This study may open up a new way for design and synthesize flexible high performance polymer from renewable biomass materials.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Hefei Wang,Zeming Wang,Jibao Deng,Jian Wang,Yanzheng Gao
With low bioaccessbility, persistence of the undissolved organic pollutants in soil and sediments poses threat to health of the resident. Although ubiquitous black carbon catalyzes a wide range of biogeochemical reactions in nature, its role in biotransformation of the compounds in non-aqueous phase like 2, 2′-nitrobiphenyl remains unclear. Reduction rate constants of 2, 2′-dinitrobiphenyl by Shewanella oneidensis MR-1 increased from 0.0044 h −1 by 7-fold to 0.035 h −1 in the presence of black carbons produced at pyrolysis temperature of 250–900 °C. Accordingly, electrical conductivity of black carbon was enhanced from 0 to 5.56 S∙cm −1 . The reactivity of black carbon for catalyzing the biotransformation positively correlated with its electrical conductivity ( R 2 > 0.89), which was strongly associated with conductive graphitic clusters in it. The surface oxygenated groups in black carbon were likely not involved in the bioreduction. This work attaches importance to role of the ubiquitous black carbon in natural biotransformation of the undissolved pollutants, and elucidates new mechanism for the biotransformation.
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MOLECULES
·
2016
·Vol. 21
·期 5
·555
·
IF 2.465
Zhongxiu Zhang,Xiaohui Wang,Wanqing Yang,Juan Wang,Cong Su,Xiao Liu,Jun Li,Yunfang Zhao,Shepo Shi,Pengfei Tu
Five 2-(2-phenylethyl)chromones including a new one, (5S,6R,7S,8R)-5,8-dichloro-6,7-dihydroxy-2-phenylethyl-5,6,7,8-tetrahydro-4H-chromen-4-one (1), and four known ones (2–5), were isolated from 150 mM NaCl-elicitedAquilaria sinensiscell suspension cultures. In addition, three feruloyl amides (6–8), six nucleosides (9–14), (+)-syringaresinol (15), indole-3-carboxaldehyde (16), and two glycosides (17–18) were also obtained. The structures were unambiguously identified by analysis of their UV, IR, NMR, and HRESIMS data. The absolute configuration of the new 2-(2-phenylethyl)chromone (1) was established by a dimolybdenum tetraacetate-induced circular dichroism experiment. Compared to un-elicited cell lines, the appearance of 2-(2-phenylethyl)chromones in NaCl-treated cells occurred on the 3rd and 5th days of their treatment. 2-(2-Phenylethyl)chromones, feruloyl amides, nucleosides, and lignins have been reported to be closely related to plant defense; therefore, the identification of these compounds from NaCl-elicitedA. sinensiscell suspension cultures would be useful for further exploring the mechanism of agarwood formation.Keywords:2-(2-phenylethyl)chromone;induced circular dichroism;Aquilaria sinensis;agarwood;cell suspension cultures;sodium chloride elicitation
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Yumei Shu,Jinxiu Hu,Lin Yang,Tehreem yaqub,Minhua Ai,Yang Liu,Dandan Shi,Kang Xue,Chengxiang Shi,Xiangwen Zhang,Ji-Jun Zou,Lun Pan
Intramolecular [2+2] photocycloaddition is a reliable way to synthesize high-strained cyclobutyl-containing structures for high-value chemicals. Here we propose a photosensitized dimer of methyl cyclopentadiene (DMCPD) intramolecular [2+2] cycloaddition to synthesize an intriguing liquid caged fuel, namely 3, 8-dimethylpentacyclic [5.3.0.0 2,5 .0 3,9 .0 4.8 ] decane (MPCD), with two four-membered rings, four five-membered rings and two methyl branched chains. The reaction conditions are optimized to obtain a high DMCPD conversion of 80.95% as well as a high MPCD selectivity of 74.19%. Based on the quenching experiment and low-temperature phosphorescence test, intramolecular [2+2] photocycloaddition complies with the Dexter triplet-energy-transfer mechanism, which is essentially double electron exchange between excited photosensitizer and DMCPD. Through kinetic studies, the reaction order ( α =1) and the reaction kinetic equation related to light intensity and DMCPD concentration are obtained. MPCD has excellent physicochemical properties, with a high density of 0.964 g·cm -3 , high net heat of combustion of 42.63 MJ·kg -1 , relatively low kinetic viscosity of 25.03 mm 2 ·s -1 at (20°C), and high specific impulse of 328.19 s.
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MOLECULAR PHYSICS
·
2024
·
IF 1.6
Gang Wang,Lina Ding,Yang Liu,Yonggang Yang,Yufang Liu
2-(2'-Hydroxyphenyl) benzimidazole (HBI) and its derivatives are widely used in fluorescent probes, luminescent materials, and other sensing materials. In this study, the time-resolved fluorescence behaviour, and excited-state dynamics of HBI and 2-phenyl-1H-benzo[d]imidazole (BI) were studied using femtosecond transient absorption (fs-TA) spectroscopy. The stimulated emission (SE) and excited-state absorption signals of the BI molecule were located at 355 and 437 nm, respectively. For HBI, these signals were located at 475 and 384 nm, respectively. The SE signals of the BI and HBI molecules in their fs-TA spectra were consistent with the experimental short-wave fluorescence at 340 and 460 nm, respectively, in the steady-state spectra. The long-wave signal of HBI at 475 nm indicates its dual fluorescence, which may be caused by proton transfer or conformational torsion after photoexcitation. The large theoretical energy barrier of 40.97 kcal/mol in first excited (S1) state of HBI excludes the latter hypothesis. Additionally, the small energy barrier (1.88 kcal/mol) in the S1 state confirmed the excited-state intramolecular proton transfer (ESIPT). This indicates that ESIPT induces dual fluorescence behaviour of the HBI molecule, which was also demonstrated by the infrared spectra, theoretical fluorescence peaks, and molecular orbitals.
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CHEMISTRY & BIODIVERSITY
·
2025
·
IF 2.5
Qian Luo,Chen Sun,Xue Zhao,Er-Wei Li,Yu-Qing Yi,Yang Zhang,Shuai-Ming Zhu,Yu Yang,Rui Xu,Li-Xia Chen,You-Zhi Zhang,Chang-Wei Li
Two new cytochalasins ( 1 and 2 ) were isolated from the fermentation products of the fungus Xylaria necrophora SZSS1-2-2, along with nine known compounds: compound 3 , arbuschalasin B ( 4 ), cytochalasin C ( 5 ), cytochalasin D ( 6 ), 19,20-epoxycytochalasin C ( 7 ), 19,20-epoxycytochalasin D ( 8 ), cytochalasin R ( 9 ), cytochalasin D 13,14-epoxide ( 10 ), and arbuschalasin A ( 11 ). The structures and absolute configurations of these compounds were elucidated by spectroscopic analyses, electronic circular dichroism, and GIAO 13 C NMR computational methods. All isolated compounds were evaluated for their biological activities, and the results indicated that compounds 5 – 10 exhibited notable cytotoxic effects against the tested cell lines. However, none of the compounds showed antibacterial activity. Graphical
研究领域:
天然产物化学
·
植物化学
·
微生物化学
·
药物化学
·
真菌学
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ENERGY & FUELS
·
2026
·Vol. 40
·期 33
·18043-18052
·
IF 6
Pang Bo,Pu Baian,Peng Hao,Xue Kang,Shi Chengxiang,Gao Ruijie,Ai Minhua,Huang Zhen-Feng,Zhang Xiangwen,Zou Ji-Jun,Pan Lun
Conventional
high-energy-density hydrocarbon fuels face an intrinsic
trade-off between increasing ring number and decreasing net heat of
combustion. To address this limitation, we propose a synthetic strategy
based on tandem [4 + 2]/[2 + 1] cycloaddition. Norbornadiene and methyl
dicyclopentadiene were employed as feedstocks to develop a coupled
synthetic approach that combines Diels–Alder [4 + 2] cycloaddition
for constructing a polycyclic framework with Simmons–Smith
[2 + 1] cyclopropanation for energy enhancement. By optimizing the
reaction parameters, the Diels–Alder and Simmons–Smith
reactions achieved optimal conversions of 77.89% and 90.96%, respectively,
with selectivities of 43.54% and 85.82%. The resulting fuel fraction
exhibits a high density of 1.060 g cm –3 , a volumetric
net heat of combustion of 44.85 MJ L –1 , and a freezing
point below −60 ° C. This study demonstrates an effective
strategy for simultaneously achieving high density, high volumetric
energy content, and excellent low-temperature performance, providing
useful guidance for the molecular design and synthesis of next-generation
high-energy-density fuels.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2015
·
IF 2.912
Rong Wang,Xiaoyan Zhi,Jie Li,Hui Xu
To discover novel natural-product-based pesticidal agents, we prepared a series of oxime sulfonate derivatives of 2′(2′,6′)-(Di)chloropicropodophyllotoxins by structural modification of podophyllotoxin. Their structures were well-characterized by proton nuclear magnetic resonance (1H NMR), high-resolution mass spectrometry (HRMS), optical rotation, and melting point. Moreover, the key steric structure of compound 5f was unambiguously determined by single-crystal X-ray diffraction. Additionally, their insecticidal activity was evaluated at 1 mg/mL against the pre-third-instar larvae of oriental armyworm (Mythimna separata Walker), a typical lepidopteran pest. Among all derivatives, compounds 4c, 5c, and 5d exhibited more promising insecticidal activity, with the final mortality rates greater than 60%, when compared to their precursor podophyllotoxin and the positive control, toosendanin. It demonstrated that introduction of the chlorine atom at the C-2′ or C-2′,6′ position on the E ring of picropodophyllotoxin or oxime sulfonate derivatives of picropodophyllotoxin was important for the insecticidal activity and introduction of a halogen (e.g., fluorine, chlorine, or bromine) atom-substituted phenylsulfonyl group on the oxime fragment of 2′(2′,6′)-(di)chloropicropodophyllones could lead to more promising compounds.
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RSC Advances
·
2022
·Vol. 12
·期 15
·9342-9350
·
IF 4.036
Yuyi Zhang,Wei Zhang,Yajie Bian,Yiting Liu,Xiaolei Zhang,Mengdi Chen,Bingwen Hu,Qingyuan Jin
Zeolitic imidazolate framework-8 (ZIF-8) is one of the most promising metal–organic frameworks because of its excellent high porosity, stability and geometrically well-defined structure. However, the application of ZIF-8 in the field of fluorescent molecular sensing has not been intensively explored. Our work demonstrates the versatility of ZIF-8 as a carrier material, which can be used for small molecule [2-(2-hydroxyphenyl)-1H-benzimidazole (HPBI)] capture and fluorescence enhancement. ZIF-8 displays luminescent behavior changes when combined with HPBI, as the emission peaks of ZIF-8 and HPBI are located in the same range for resonance enhancement of fluorescence. The results of the experiment indicate that the fluorescence enhancement effect will change in the presence of different concentrations of HPBI. We propose that the pore structure of ZIF-8 could provide an opportunity for the adsorption of HPBI molecules, and eventually the adsorption would saturate. The high porosity of ZIF-8 provides the path to HPBI aggregation or entrance into the ZIF-8 internal structure. Our results suggest that ZIF-8 may offer great promise for molecular fluorescence sensing.
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