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The role of flavonoids in mitigating food originated heterocyclic aromatic amines that concerns human wellness
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作者 Hui Teng Hongting Deng +3 位作者 Chang Zhang Hui Cao Qun Huang Lei Chen 《Food Science and Human Wellness》 SCIE CSCD 2023年第4期975-985,共11页
Meat products are an important part in our daily diet,providing valuable nutrients for the human body.However,heating processes cause the meat to become more appetizing with changes in texture,appearance,flavor,and ch... Meat products are an important part in our daily diet,providing valuable nutrients for the human body.However,heating processes cause the meat to become more appetizing with changes in texture,appearance,flavor,and chemical properties by the altering of protein structure and other ingredients.As one kind of cooking-induced contaminants,heterocyclic aromatic amines(HAAs)are widely present in protein aceous food products with strong carcinogenic and mutagenic properties.In order to promote the safety of traditional meat products,this review focused on the formation,metabolism,biological monitoring and inhibitory mechanism of HAA.An overview of the formation pathways,hazards,and control methods of HAAs during food processing in recent years was studied,aiming to provide some valuable information for exploring effective methods to inhibit the production of associated hazards during food processing.Systematic selection of different types of flavonoids to explore their effects on the formation of HAAs in an actual barbecue system can provide theoretical reference for effectively controlling the formation of HAAs and reducing their harm to human health. 展开更多
关键词 Heterocyclic aromatic amines FLAVONOIDS Hazardous control Precursors
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Ionic liquid based dispersive liquid-liquid microextraction of aromatic amines in water samples 被引量:13
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作者 Yun Chang Fan Zheng Liang Hu +2 位作者 Mei Lan Chen Chao Shen Tu Yan Zhu 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第8期985-987,共3页
In this work, a new microextraction method termed ionic liquid based dispersive liquid-liquid microextraction (IL-DLLME) was demonstrated for the extraction of 2-methylaniline, 4-chloroaniline, 1-naphthylamine and 4... In this work, a new microextraction method termed ionic liquid based dispersive liquid-liquid microextraction (IL-DLLME) was demonstrated for the extraction of 2-methylaniline, 4-chloroaniline, 1-naphthylamine and 4-aminobiphenyl in aqueous matrices. After extraction the ionic liquid (IL) phase was injected directly into the high performance liquid chromatography (HPLC) system for determination. Some parameters that might affect the extraction efficiency were optimized. Under the optimum conditions, good linear relationship, sensitivity and reproducibility were obtained. The limits of detection (LOD, S/N = 3) for the four analytes were in the range of 0.45-2.6 μg L^-1. The relative standard deviations (R.S.D., n = 6) were in the range of 6.2-9.8%. This method was applied for the analysis of the real water samples. The recoveries ranged from 93.4 to 106.4%. The main advantages of the method are high speed, high recovery, good repeatability and volatile organic solvent-free. 展开更多
关键词 Ionic liquid (IL) Dispersive liquid-liquid microextraction (DLLME) High performance liquid chromatography (HPLC) aromatic amines
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Curing Reaction Kinetics of Epoxy Resin Using Dicyandiamide Modified by Aromatic Amines 被引量:7
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作者 CHEN Lianxi TIAN Hua +1 位作者 LIU Quanwen Wang Jun 《Wuhan University Journal of Natural Sciences》 CAS 2007年第6期1105-1108,共4页
The curing reaction and reaction mechanism of epoxy resin E-44, for which aromatic amine modified dicyandiamide was used as a curing reagent, were investigated by means of differential scanning calorimetry (DSC). Th... The curing reaction and reaction mechanism of epoxy resin E-44, for which aromatic amine modified dicyandiamide was used as a curing reagent, were investigated by means of differential scanning calorimetry (DSC). The results showed that the modified dicyandiamide had better curing characteristic than unmodified dicyandiamide for epoxy resin E-44, and the curing reaction could be carried out at moderate temperature. Apparent activation energy of the curing reaction was decreased appreciably from 123.829 kJ/mol to 61.550-64.405 kJ/mol, and reaction order was decreased from 0.941 to 0.896-0.900. Curing reaction mechanism also was discussed. 展开更多
关键词 modified dicyandiamide aromatic amine epoxy resin KINETICS
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Predicting the Acute Toxicity of Aromatic Amines by Linear and Nonlinear Regression Methods 被引量:4
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作者 张晓龙 周志祥 +3 位作者 刘阳华 范雪兰 李捍东 王建涛 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2014年第2期244-252,共9页
In current paper, a quantitative structure-activity relationship (QSAR) study was performed for the prediction of acute toxicity of aromatic amines. A set of 56 compounds was randomly divided into a training set of ... In current paper, a quantitative structure-activity relationship (QSAR) study was performed for the prediction of acute toxicity of aromatic amines. A set of 56 compounds was randomly divided into a training set of 46 compounds and a test set of 10 compounds. The electronic and topological descriptors computed by the Scigress package and Dragon software were used as predictor variables. Multiple linear regression (MLR) and support vector machine (SVM) were utilized to build the linear and nonlinear QSAR models, respectively. The obtained models with five descriptors show strong predictive ability. The linear model fits the training set with R2 = 0.71, with higher SVM values of R2 = 0.77. The validation results obtained from the test set indicate that the SVM model is comparable or superior to that obtained by MLR, both in terms of prediction ability and robustness. 展开更多
关键词 aromatic amines acute toxicity quantitative structure-activity relationship(QSAR) support vector machine (SVM) multiple linear regression (MLR)
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A Novel Synthesis of N-Methyl-N-aryl Carbamates from Aromatic Amines and Dimethyl Carbonate Catalyzed by K_2CO_3/Bu_4NBr 被引量:1
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作者 ZhenLuSHEN XuanZhenJIANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第8期889-891,共3页
A facile synthesis of N-methyl-N-aryl carbamates from aromatic amines and dimethyl carbonate (DMC) has been achieved with high yields in the presence of potassium carbonate (K2CO3)and tetrabutylammonium bromide (Bu4NB... A facile synthesis of N-methyl-N-aryl carbamates from aromatic amines and dimethyl carbonate (DMC) has been achieved with high yields in the presence of potassium carbonate (K2CO3)and tetrabutylammonium bromide (Bu4NBr) under solvent-free conditions. 展开更多
关键词 CARBAMATE aromatic amines dimethyl carbonate tetrabutylammonium bromide.
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Ce(SO_4)_2-mediated Oxidative Coupling of Primary Aromatic Amines in Water 被引量:1
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作者 LU Wen-chao XI Chan-juan 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2009年第5期638-643,共6页
The oxidative coupling of primary aromatic amines was investigated. Ce(SO4)2 can mediate the oxidative coupling of primary aromatic amines in water to dimers, trimers and/or tetramers, which depended on the substitu... The oxidative coupling of primary aromatic amines was investigated. Ce(SO4)2 can mediate the oxidative coupling of primary aromatic amines in water to dimers, trimers and/or tetramers, which depended on the substituents of primary aromatic amines. When 2,6-dimethylaniline or 2,6-diethylaniline was used as substrate, dimer, and tetramer were formed as major products. When 2,6-diisopropylaniline or 2,6-dihaloanilines was used as substrate, dimer, and trimer were formed. The mechanistic aspect was also investigated. 展开更多
关键词 Primary aromatic amine Oxidative coupling Cerium sulfate
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Inhibition of Heterocyclic Aromatic Amines in Pork Chops Using Complex Marinades with Natural Antioxidants 被引量:2
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作者 Margit D. Aaslyng Birgitte Winther Lund Kirsten Jensen 《Food and Nutrition Sciences》 2016年第14期1315-1329,共15页
Five marinades were developed using natural antioxidants. Based on a consumer test of the appearance, three marinades were chosen for further investigation: an oregano, an acerola and a Dijon marinade, the Dijon marin... Five marinades were developed using natural antioxidants. Based on a consumer test of the appearance, three marinades were chosen for further investigation: an oregano, an acerola and a Dijon marinade, the Dijon marinade containing acerola, sumac and oregano. A barbecue and a sumac marinade were not included in the further study. In a home use test, consumers barbecued pork chops with the three marinades. Most of the consumers preferred the oregano and the Dijon marinade, while the acerola marinade was less liked. After controlled cooking using both direct and indirect heat to a core temperature of 65°C and 80°C, the content of the heterocyclic aromatic amines (HCA) PhiP, MeIQx, DiMeIQx, Harman and Norharman was analysed. All of the marinades reduced the content of MeIQx and DiMeIQx, although only with indirect heat, while PhiP was reduced using both grilling methods. Surprisingly, in particular the content of Harman—and to a lesser extent Norhaman—was very high in the Dijon-marinated chops. The results demonstrated that it was possible to develop well-liked marinades that can reduce the formation of selected HCAs. 展开更多
关键词 PORK Marinades Heterocyclic aromatic amines
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ALLYLATION OF AROMATIC AMINES VIA ALLYLDIALKYLTELLURONIUM SALTS
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作者 Cai Ding XU Xian HUANG Department of Chemistry,Hangzhou University,Hangzhou 310028.Shou Mao LU Department of Chemistry,Xianning Normal College,Hubei 437005. 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第10期869-870,共2页
Allyldialkyltelluronium bromides were treated with aromatic amines in 1,2-dichloroethane,readily giving allyl aryl amines in excel- lent yields.This method provides a convenient one-pot reaction for the synthesis of a... Allyldialkyltelluronium bromides were treated with aromatic amines in 1,2-dichloroethane,readily giving allyl aryl amines in excel- lent yields.This method provides a convenient one-pot reaction for the synthesis of allylic amines. 展开更多
关键词 ZC HZ ALLYLATION OF aromatic amineS VIA ALLYLDIALKYLTELLURONIUM SALTS CIC Res Cl VIA
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Unexpected Exposure Risks to Emerging Aromatic Amine Antioxidants and p‑Phenylenediamine Quinones to Residents:Evidence from External and Internal Exposure as Well as Hepatotoxicity Evaluation 被引量:1
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作者 Zijin Guo Zhipeng Cheng +5 位作者 Shaohan Zhang Hongkai Zhu Leicheng Zhao Mujtaba Baqar Lei Wang Hongwen Sun 《Environment & Health》 2024年第5期278-289,共12页
Aromatic amine antioxidants(AAs),extensively used in rubber products,and their ozone-photolyzed product pphenylenediamine quinones(PPD-Qs)were found to be pervasive in various environments and with potential ecologica... Aromatic amine antioxidants(AAs),extensively used in rubber products,and their ozone-photolyzed product pphenylenediamine quinones(PPD-Qs)were found to be pervasive in various environments and with potential ecological and health risks.The relationship between external and internal exposure to these contaminants and their exposure risks to the general population remain poorly explored.Herein,dust−handwipe−urine samples(n=97 pairs)from families in Tianjin,China was collected for analyzing 20 AAs and 6 PPD-Qs(including self-synthesized emerging PPD-Qs).The median concentration ofΣ_(20)AAs(1310 ng/g,354 ng/m^(2),and 18.5 ng/mL,respectively)andΣ_(6)PPD-Qs(1645 ng/g,3913 ng/m^(2)and 3.76 ng/mL,respectively)in dust,handwipe,and urine samples indicated a non-negligible contamination of AAs and PPD-Qs in indoor environment.Notably,emerging DPPD-Q and DNPD-Q(oxidation products of DPPD and DNPD,respectively)were prominent,accounting for>90%of PPD-Qs.The correlation analysis and estimated daily intake(EDI)assessments indicated that neither dust ingestion nor dermal exposure may be the primary source of internal exposure to AAs and PPD-Qs in the general population,and other exposure pathways(e.g.,diet and inhalation)may exist.In vitro HepG2 cell experiments demonstrated that both PPD-Qs and PPDs may have potential exposure risk of hepatotoxicity. 展开更多
关键词 aromatic amine antioxidants P-PHENYLENEDIamine human exposure risk assessment cytotoxicity
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“On Water”Effect for Green Click Reaction:Spontaneous Polymerization of Activated Alkyne with“Inert”Aromatic Amine in Aqueous Media 被引量:1
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作者 Xinyue Liu Chen Zhang +6 位作者 Lianrui Hu Jinghan Wang Kai Li Hai-Tao Feng Jacky WYLam Benzhao He Ben Zhong Tang 《CCS Chemistry》 CAS CSCD 2023年第2期385-396,共12页
Organic reactions in water have attracted great attention due to their advantages such as unique reaction performance and environmental friendliness.Organic reactions as well as polymerizations in aqueous media have b... Organic reactions in water have attracted great attention due to their advantages such as unique reaction performance and environmental friendliness.Organic reactions as well as polymerizations in aqueous media have been extensively investigated,and so far,there has been a massive amount of reporting about polymerizations in water.However,reports about click polymerization in water have been rare.Herein,click polymerization of activated alkyne and aromatic amine in aqueous media is developed.The“on water”effect facilitates polymerization in aqueous media better than in organic solvents,and its mechanism is deciphered through experimental data and theoretical calculations.Water participates in the reaction and reduces the energy barrier to some extent.Besides,polymerization makes it possible for aromatic amine with low reactivity to be linked.By using this strategy,polymers with high molecular weights can be obtained in high yields(up to 95.4%).They show good thermal stability and high refractivity.They can be photodegraded.The polymers with tetraphenylethylene moieties show aggregation-induced emission and can be used as materials for generating photopatterns and visualizing agents for specific staining of lysosome in living cells. 展开更多
关键词 “on water”effect click polymerization aromatic amine PHOTODEGRADATION specific lysosome-staining
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Critical steps in the production of oil from oilseed to reduce heterocyclic aromatic amines
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作者 张晨霞 李梦乐 +3 位作者 马玮玮 马宇翔 汪学德 刘华敏 《Food Quality and Safety》 SCIE CAS CSCD 2023年第4期588-596,共9页
Contamination by the heterocyclic aromatic amines(HAAs)norharman and harman is one of the risks in vegetable oil production,so oil producers strive to decrease their content in the end products.In this study,the effec... Contamination by the heterocyclic aromatic amines(HAAs)norharman and harman is one of the risks in vegetable oil production,so oil producers strive to decrease their content in the end products.In this study,the effects of production conditions—specifically,two pretreatment methods(roasting and microwaving),four extraction methods(two pressing and two solvent extraction)and adsorption refining(four absorbents)—of five oils(flaxseed,peanut,rapeseed,sesame,and sunflower seed)were evaluated.The results showed that microwaving as a pretreatment produced significantly fewer HAAs than roasting(P<0.05).After two pretreatments,the HAA content of oils was ranked from high to low as follows:sunflower oil,sesame oil,flaxseed oil,rapeseed oil,and peanut oil.Solvent-extracted oils(9.16–316.73μg/kg)had fewer HAAs than pressed oils(26.61–633.93μg/kg).Using adsorbents reduced HAAs in oils from the initial 21.77–484.22 to 0.31–41.58μg/kg,and the removal rate reached 99.28%.This study provides critical HAA reduction strategies for application in the oil production process to obtain safe final products. 展开更多
关键词 Heterocyclic aromatic amines NORHARMAN HARMAN OILS reduction strategies
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Copper-Promoted Conversion of Aromatic Amines into Trifluoromethylated Arenes: One-Pot Sandmeyer Trifluoromethylation 被引量:5
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作者 Jianquan Hong Guifu Wang +1 位作者 Lianguang Huo Changge Zheng 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2017年第11期1761-1767,共7页
A simple copper-promoted one-pot Sandmeyer trifluoromethylation of aromatic amines with Langlois' reagent has been demonstrated. The reaction is performed in mild reaction conditions under an air atmosphere with good... A simple copper-promoted one-pot Sandmeyer trifluoromethylation of aromatic amines with Langlois' reagent has been demonstrated. The reaction is performed in mild reaction conditions under an air atmosphere with good substrate scope and functional group compatibility. It provides an alternative and straightforward synthetic approach to access a variety of trifluoromethylated arenes. 展开更多
关键词 COPPER sandmeyer trifluoromethylation aromatic amine langlois' reagent trifluoromethylated arene
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Catalytic Thiourea Promoted Electrophilic Thiocyanation of Indoles and Aromatic Amines with NCS/NH4SCN 被引量:1
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作者 Cancan Wang Zhonghao Wang +2 位作者 Liang Wang Qun Chen Mingyang He 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2016年第11期1081-1085,共5页
A simple and efficient protocol for the electrophilic thiocyanation of indoles and aromatic amines with thiourea/NCS/NH4SCN system has been developed. The major features of the present procedure are the mild condition... A simple and efficient protocol for the electrophilic thiocyanation of indoles and aromatic amines with thiourea/NCS/NH4SCN system has been developed. The major features of the present procedure are the mild conditions, good yields, short reaction times, and the use of inexpensive and readily available organocatalyst. Moreover, N-chlorosueeinimide (NCS) was found to be indispensable, and thiourea could greatly promote the reaction. 展开更多
关键词 THIOCYANATION INDOLES aromatic amines catalytic thiourea N-chlorosuccinimide
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Regiospecific oxidation of an alkyl group of aromatic amine to carbonyl group by DDQ in aq.medium 被引量:1
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作者 Madhav S.Mane Ravi S.Balaskar +3 位作者 Sandip N.Gavade Pramod N.Pabrekar Murlidhar S.Shingare Dhananjay V.Mane 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第9期1039-1042,共4页
The regiospecific oxidation of alkyl group of both sterically hindered and unhindered aromatic amine to corresponding carbonyl compound was done in aq. medium by using DDQ. The optimized reaction protocol was found to... The regiospecific oxidation of alkyl group of both sterically hindered and unhindered aromatic amine to corresponding carbonyl compound was done in aq. medium by using DDQ. The optimized reaction protocol was found to be most simple, high yielding and novel method for oxidation of alkyl group of aromatic amine in to its carbonyl compound. 展开更多
关键词 DDQ Aq. medium Regiospecific oxidation aromatic amine
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Porous boronate affinity monolith for on-line extraction coupled to high-performance liquid chromatography for sensitive analysis of heterocyclic aromatic amines in food samples 被引量:4
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作者 Qian-Chun Zhang Ying-Yi Cheng +1 位作者 Gong-Ke Li Xiao-Hua Xiao 《Chinese Chemical Letters》 SCIE CAS CSCD 2015年第12期1470-1477,共8页
A novel on-line solid-phase microextraction–high-performance liquid chromatography(SPME–HPLC)system was developed for the determination of heterocyclic aromatic amines(HAAs) in food samples. A poly(vinylphenylb... A novel on-line solid-phase microextraction–high-performance liquid chromatography(SPME–HPLC)system was developed for the determination of heterocyclic aromatic amines(HAAs) in food samples. A poly(vinylphenylboronic acid-co-ethylene glycol dimethacrylate) polymer monolith was prepared for on-line efficient extraction and large-volume injection was used to increase the sensitivity of detection.The polymermonolith, based on a ternary porogen, was prepared by in situ polymerization of vinylphenylboronic acid(VPBA) and ethylene glycol dimethacrylate(EGDMA) in a fused-silica capillary column. It showed good permeability, high extraction capacity, and high selectivity. The column-tocolumn reproducibility was satisfactory, and the enrichment factors for HAAs were 3746–7414.Conditions influencing the on-line extraction efficiency, including p H of sample solutions, flow rate of extraction and desorption, and desorption volume, were investigated. The proposed method had low limit of detection(0.10–0.15 ng/L) and good linearity. Trace HAAs in roast beef and lamb samples were determined, and the amounts of 2-amino-3-methylimidazo[4,5-f]quinoline, 2-amino-3,4-dimethylimidazo[4,5-f]quinoline, 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline, 2-amino-3,4,8-trimethylimidazo[4,5-f]quinoxaline, and 2-amino-3,4,7,8-tetramethyl-3H-imidazo[4,5-f]quinoxaline in these samples were 0.235–2.08 ng/g. The recoveries for the five HAAs ranged from74.3% to 119%, and the relative standard deviation(RSDs) were less than 8.2%. The results showed that the proposed on-line method was highly sensitive for monitoring HAAs in different food samples. 展开更多
关键词 heterocyclic aromatic amines polymerization glycol tetramethyl selectivity desorption permeability silica
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Effect of woodchip types on heterocyclic aromatic amine formation and quality characteristics of smoked bacon 被引量:1
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作者 Hongzhen Du Qian Liu +3 位作者 Qian Chen Xiufang Xia Ming Xu Baohua Kong 《Food Bioscience》 SCIE 2022年第3期938-946,共9页
The impact of different woodchips(beech,oak,pear,and apple)on the contents of heterocyclic aromatic amines(HAAs)and quality characteristics of smoked bacon was investigated.The results indicated that the contents of t... The impact of different woodchips(beech,oak,pear,and apple)on the contents of heterocyclic aromatic amines(HAAs)and quality characteristics of smoked bacon was investigated.The results indicated that the contents of total HAAs and non-polar HAAs in beech-and oak-smoked bacon were lower than that in pear-and apple-smoked bacon(P<0.05).There were no HAAs detectable in control(non-smoking)sample.The smoking process promoted the formation of free amino acids(FAA)in the smoked bacon.The total contents of FAA in beech-and oak-smoked bacon were higher than these in the pear-and apple-smoked bacons(P<0.05).The beech-smoked bacon had the highest L^(*)-value(P<0.05),and oak-smoked bacon had the lowest thiobarbituric acid-reactive substance(TBARS)value and carbonyl content(P<0.05).Additionally,woodchip types had no significant influence on a^(*)-value,b^(*)-value,moisture content,aw,T_(20),T_(21) and T_(22)(P>0.05).PCA of the HAA contents and quality characteristics could effectively differentiate that were unsmoked and smoked bacon.Therefore,woodchip types had a great influence on HAA contents and quality of smoked bacon. 展开更多
关键词 Heterocyclic aromatic amine BACON Woodchips Quality SMOKING
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Enantioselective and a-Regioselective Allylic Amination of Morita-Baylis-Hillman Acetates with Simple Aromatic Amines Catalyzed by Planarly Chiral Ligand/Palladium Catalyst 被引量:1
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作者 王炎 张涛 +2 位作者 刘利 王东 陈拥军 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2012年第11期2641-2646,共6页
An asymmetric allylic amination of Morita-Baylis-Hillman acetates with simple aromatic amines catalyzed by planarly chiral ligand/palladium-catalyst was developed in good yield with excellent a-regioselectivity (a/γ... An asymmetric allylic amination of Morita-Baylis-Hillman acetates with simple aromatic amines catalyzed by planarly chiral ligand/palladium-catalyst was developed in good yield with excellent a-regioselectivity (a/γ up to 30 : 1) and moderate enantioselectivity (up to 70% ee). 展开更多
关键词 asymmetric allylic amination Morita-Baylis-Hillman adducts aromatic amines palladium catalysis diphosphine ligands
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Determination of primary aromatic amines using immobilized nanoparticles based surface-enhanced Raman spectroscopy 被引量:2
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作者 Ting Wu Hai-Ting Wang +5 位作者 Bo Shen Yi-Ping Du Xuan Wang Zhen-Ping Wang Chuan-Jing Zhang Wen-Bin Miu 《Chinese Chemical Letters》 SCIE CAS CSCD 2016年第5期745-748,共4页
Primary aromatic amines (PAAs) are substances with toxicity and suspected human carcinogenicity. A facile method for highly sensitive detection of PAAs using surface-enhanced Raman spectroscopy (SERS) is reported.... Primary aromatic amines (PAAs) are substances with toxicity and suspected human carcinogenicity. A facile method for highly sensitive detection of PAAs using surface-enhanced Raman spectroscopy (SERS) is reported. The immobilization of Au nanoparticles (AuNPs) on the glycidyl methacrylate-ethylene dimethacrylate (GMA-EDMA) materials makes the suhstrate a closely packed but not aggregated Au NP arrays which provides a prominent SERS enhancement. Four PAAs with different substituent groups, namely, p-toluidine, p-nitroaniline, benzidine and 4,4-methylene-bis-(2-chloroaniline) have been successfully identified and quantified. High sensitivity and good linear relationship between SERS signals and concentrations of PAAs are obtained for all four PAAs. 展开更多
关键词 aromatic amines Surface-enhanced Raman spectroscopy(SERS) Immobilization Au nanoparticles
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Crystallization-induced phosphorescence, remarkable mechanochromism, and grinding enhanced emission of benzophenone-aromatic amine conjugates
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作者 Weijian Luo Yiren Zhang +3 位作者 Yongyang Gong Qing Zhou Yongming Zhang Wangzhang Yuan 《Chinese Chemical Letters》 SCIE CAS CSCD 2018年第10期1533-1536,共4页
Pure organic luminogens with efficient room temperature phosphorescence(RTP) and remarkable mechanochromism are highly desired in view of their fundamental significance and technical applications. Herein, four twist... Pure organic luminogens with efficient room temperature phosphorescence(RTP) and remarkable mechanochromism are highly desired in view of their fundamental significance and technical applications. Herein, four twisted pure organic luminogens based on benzophenone and aromatic amines were synthesized and their photophysical properties were thoroughly investigated. They exhibit crystallization-induced phosphorescence(CIP), giving bright fluorescence and phosphorescence dual emission in crystals. Upon grinding, they become amorphous and emit predominantly red-shifted fluorescence, demonstrating remarkable mechanochromism. Furthermore, three of them even demonstrate greatly enhanced emission upon grinding, which is rarely observed in twisted D-A structured luminogens. 展开更多
关键词 Crystallization-induced phosphorescence Room temperature phosphorescence Mechanochromism BENZOPHENONE aromatic amines
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The Oxirane Ring Opening of 2,3-endo-epoxybicyclo[3. 2 .0] hept-6-one by Amines at Alumina Surface
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作者 Yan Mei HE Guo Hao XIE +1 位作者 Ai Lian ZHENG Yuan Liu WU(Institute of Materia Medica, Chinese Academy of Medical Sciences, Bejing 100050) 《Chinese Chemical Letters》 SCIE CAS CSCD 1998年第6期513-514,共2页
Stereospecific (trans) and regioselective nucleophilic opening of the title epoxide (I) by different amines at the alumina surface are described.
关键词 Oxirane Ring Opening aliphatic amines aromatic amines
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