中国化学快报

Select

Imidazolium ionic liquid-supported sulfonic acids:efficient and recyclable catalysts for esterification of benzoic acid

Yue Qin Cai, Guo Qiang Yu, Chuan Duo Liu, Yuan Yuan Xu, Wei Wang

中国化学快报. 2012, 23(01): 1-4. https://doi.org/10.1016/j.cclet.2011.09.016

摘要 ( )

PDF全文 ( )

可视化

Several imidazolium ionic liquid (IL)-supported sulfonic acids with different anions,[C₃SO₃Hmim]HSO₄,[C₃SO₃Hmim]BF₄,[C₃SO₃Hmim]PF₆, and[C₃SO₃Hmim]CF₃SO₃, were synthesized and applied as catalysts for esterification reaction of benzoic acid. The experimental results indicate that imidazolium IL-supported sulfonic acid containing anion of HSO₄^- shows the best catalytic activity. Only when less[C₃SO₃Hmim]HSO₄ (0.3 equiv.) applied, was the product obtained with high yield of 97%. Furthermore, the produced esters could be separated by decantation, and the catalyst could be reused after the removal of water.

Select

Isoquinoline-mediated S-vinylation and N-vinylation of benzo[d]oxazole-2-thiol and benzo[d]thiazole-2-thiol

Issa Yavari, Samira Nasiri-Gheidari, Anvar Mirzaei

中国化学快报. 2012, 23(01): 5-8. https://doi.org/10.1016/j.cclet.2011.10.001

摘要 ( )

PDF全文 ( )

可视化

An effective route to S-vinylated and N-vinylated benzo[d]oxazole-2(3H)-thiones and benzo[d]thiazole-2(3H)-thiones is described via reaction of acetylenic esters and benzo[d]oxazole-2-thiol and benzo[d]thiazole-2-thiol in the presence of 15 mol% of isoquinoline.

Select

Synthesis and antibacterial activity of pleuromutilin derivatives with novel C(14) side chain

Li Qiang Fu, Chen Yu Ling, Xing Sheng Guo, Hui Li He, Yu She Yang

中国化学快报. 2012, 23(01): 9-12. https://doi.org/10.1016/j.cclet.2011.10.002

摘要 ( )

PDF全文 ( )

可视化

In order to find novel antibacterial agents with superior antibacterial activity and overcoming multidrug resistance, a series of pleuromutilin derivatives with novel C(14) side chains were synthesized and evaluated for their in vitro antibacterial activities. The results of antibacterial acticities indicated that most of the derivatives showed potent activities against Gram-positive organisms. In particular, compound 10d exhibited the most potent inhibitory activity compared with pleuromutilin and linezoid, emerged as potential molecule for further investigation.

Select

Cyclic phosphoric acid catalyzed one-pot, four-component synthesis of 1,2,4,5-tetrasubstituted imidazoles

Xiang Bo Wang, Lin He, Teng Yue Jian, Song Ye

中国化学快报. 2012, 23(01): 13-16. https://doi.org/10.1016/j.cclet.2011.09.018

摘要 ( )

PDF全文 ( )

可视化

Cyclic phosphoric acid catalyzed one-pot, four component reactions of benzil, aldehydes, priminary amines and ammonium acetate in refluxing ethanol were developed, giving highly substituted imidazoles in excellent yield.

Select

An efficient and eco-friendly synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes using H₄[SiW₁₂O₄₀] as a heterogeneous and reusable catalyst under solvent-free conditions

S. Allameh, A. Davoodnia, A. Khojastehnezhad

中国化学快报. 2012, 23(01): 17-20. https://doi.org/10.1016/j.cclet.2011.10.003

摘要 ( )

PDF全文 ( )

可视化

A simple and efficient catalytic protocol for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes via the one-pot condensation of β-naphthol and aryl aldehydes using silicotungstic acid (H₄[SiW₁₂O₄₀]) is reported. The present method offers several advantages such as high to excellent yields, short reaction times, recovery and reusability of catalyst, mild reaction conditions and easy workup procedures.

Select

A novel and selective oxidation of benzylic alcohols with polymer-supported periodic acid under mild aprotic conditions

Ali Reza Pourali, Mehrosadat Tabaean, S. Mohamad Reza Nazifi

中国化学快报. 2012, 23(01): 21-24. https://doi.org/10.1016/j.cclet.2011.07.022

摘要 ( )

PDF全文 ( )

可视化

A new polymeric oxidizing reagent was prepared by supporting periodic acid on poly(1,4-phenylene-2,5-pyridine dicarboxyamide). This polymeric reagent was used for the selective oxidation of primary benzylic alcohols to the corresponding benzaldehydes in CH₃CN at reflux conditions. Excellent selectivity was observed between primary benzyl alcohols and secondary ones as well as non-benzylic alcohols in the oxidation reactions. Allylic alcohols were also converted to the corresponding aldehydes with good yields.

Select

Prednisolone succinate-glucosamine conjugate:Synthesis, characterization and in vitro cellular uptake by kidney cell lines

Yan Lin, Xun Sun, Tao Gong, Zhi Rong Zhang

中国化学快报. 2012, 23(01): 25-28. https://doi.org/10.1016/j.cclet.2011.07.023

摘要 ( )

PDF全文 ( )

可视化

Prednisolone succinate-glucosamine conjugate (PSG), a prodrug for prednisolone, was synthesized and confirmed by NMR and MS spectrum. The stabilities of the prodrug in PBS (pH 2.50, 5.00, 7.20, and 7.89) were studied. Cytotoxicity and uptake assay of the prodrug were perfomed on HK-2 and MDCK cell lines. The results showed that compared with prednisolone, the PSG not only did not increase the cytotoxicity but also improved the uptake to 2.2 times of prednisolone by the cells. Thus, it indicated that glucosamine might be a potential carrier for kidney-targeting delivery of prednisolone.

Select

The carbonylation of phenyl bromide and its derivatives under visible light irradiation

Wen Hui Zhong, Ying Na Cui, Shen Min Li, Ying Ping Jia, Jing Mei Yin

中国化学快报. 2012, 23(01): 29-32. https://doi.org/10.1016/j.cclet.2011.09.024

摘要 ( )

PDF全文 ( )

可视化

The carbonylation of phenyl bromide catalyzed by Co(OAc)₂ has been investigated with PhCOPh as a sensitizer under visible light in the presence of basic additive. With strong base CH₃ONa, PhCOOCH₃ is produced in 70% yield with 100% selectivity, the similar results are also obtained with a stronger base (CH₃)₃CONa. However, with another strong base NaOH, the yield of the ester is only 40%. On the other hand, with weak base NaOAc or (n-C₄H₉)₃N, phenyl bromide cannot be carbonylated. The results of carbonylation of the six substituted phenyl bromides suggest that the activities of o, m, p-BrC₆H₄CH₃ are similar to phenyl bromide, while the activities of o, m, p-BrC₆H₄Cl are higher with the high yields (≥ 93%) of the corresponding chloro-esters. In addition, the relative position of bromine and chlorine or methyl on phenyl ring has little effect on the activity of the carbonylation.

Select

A highly efficient transacetalization of 2-formylpyrrole acetals in alkaline media

Zhao Hua Yan, Run Hua Kang, Yong Jie Liu, Sen Lin

中国化学快报. 2012, 23(01): 33-36. https://doi.org/10.1016/j.cclet.2011.10.004

摘要 ( )

PDF全文 ( )

可视化

The reaction of 2-formylpyrrole acetals with sodium alkoxide in alcohols at reflux temperature smoothly proceeded to generate corresponding transacetalization products in nearly quantitative yields. A plausible mechanism involving the formation of a highly reactive intermediate azafulvene species was proposed to explain the observed transformation.

Select

Tuning the helical twisting power of nematic liquid crystals induced by chiral 1, 2-propanediol derivatives using varied substituents

Hai Quan Zhang, An Lei Qin

中国化学快报. 2012, 23(01): 37-40. https://doi.org/10.1016/j.cclet.2011.09.019

摘要 ( )

PDF全文 ( )

可视化

In this study, a novel series of chiral 1, 2-propanediol derivatives with different electron-donating and electron-withdrawing groups were synthesized and characterized by FT-IR, ¹H NMR. The helical twisting properties of all the chiral dopants were investigated by doping the chiral dopants into a nematic liquid crystal host (SLC-1717). The results indicate that the donor-acceptor electron effect have a prominent influence on helical twisting property of the chiral nematic phase induced by the chiral dopants. Introducing electron-withdrawing groups into the terminal ends of chiral 1, 2-propanediol can decrease the absolute values of the helical twisting power. In addition, the helix inversion temperatures of the induced chiral nematic phase are variational with the change of terminal groups.

Select

Facile synthesis and excellent catalytic activity of gold nanoparticles on graphene oxide

Yong Qiang He, Na Na Zhang, Yu Liu, Jian Ping Gao, Mao Cong Yi, Qiao Juan Gong, Hai Xia Qiu

中国化学快报. 2012, 23(01): 41-44. https://doi.org/10.1016/j.cclet.2011.10.005

摘要 ( )

PDF全文 ( )

可视化

For the first time, Au nanoparticles on graphene oxide (GO-AuNPs) were successfully fabricated without applying any additional reductants, just by the redox reaction between AuCl₄^-1 and GO. Their structure was characterized by transmission electron microscopy and x-ray powder diffraction. The results show that flower-like AuNPs were successfully dispersed on GO surface. Importantly, they showed a high catalytic activity for the Suzuki-Miyaura coupling reaction in an aqueous medium.

Select

Facile synthesis of N-(arylsulfonyl)-4-ethoxy-5-oxo-2, 5-dihydro-1H-pyrolle-2, 3-dicarboxylates by one-pot three-component reaction

Hossein Anaraki-Ardakani, Maziar Noei, Afrooz Tabarzad

中国化学快报. 2012, 23(01): 45-48. https://doi.org/10.1016/j.cclet.2011.09.010

摘要 ( )

PDF全文 ( )

可视化

Three-component reaction of arylsulfonamides, dialkyl acetylenedicarboxylates, and ethyl chlorooxoacetate promoted by triphenylphosphine and triethylamine provides a sufficient route for the synthesis of dialkyl N-(arylsulfonyl)-4-ethoxy-5-oxo-2,5-dihydro-1H-pyrolle-2,3-dicarboxylates in good yields.

Select

Synthesis of functionalized azadienes from aminobenzothiazole, acetylenic esters and isocyanides

Issa Yavari, Samira Arab-Salmanabadi, Ali Aminkhani

中国化学快报. 2012, 23(01): 49-52. https://doi.org/10.1016/j.cclet.2011.10.006

摘要 ( )

PDF全文 ( )

可视化

The reaction between 2-aminobenzothiazole with dialkyl acetylenedicarboxylates in the presence of isocyanides, leads to functionalized azadienes in good yields.

Select

Liquid-phase epoxidation of styrene with O₂ over alkali metal salt impregnated CoAPO-5

Xiu Feng Shi, Bao Ping Shi, Bin Bin Fan, Rui Feng Li

中国化学快报. 2012, 23(01): 53-56. https://doi.org/10.1016/j.cclet.2011.09.027

摘要 ( )

PDF全文 ( )

可视化

Liquid-phase epoxidation of styrene with atmospheric O₂ was conducted over CoAPO-5 molecular sieves. The catalytic performance of CoAPO-5 can be significantly improved by alkali metal salt impregnated on it, and styrene conversion and selectivity to styrene oxide reached 85% and 69% respectively when CsCl was impregnated on it. The catalyst was recyclable and exhibited similar catalytic activity and selectivity even after three catalytic reaction cycles.

Select

Synthesis and in vitro antimicrobial screening of new pyrano[4,3-b]pyrane derivatives of 1H-pyrazole

Chetan B. Sangani, Divyesh C. Mungra, Manish P. Patel, Ranjan G. Patel

中国化学快报. 2012, 23(01): 57-60. https://doi.org/10.1016/j.cclet.2011.09.012

摘要 ( )

PDF全文 ( )

可视化

A new series of pyrano[4,3-b]pyrane 4a-l bearing 1H-pyrazole has been synthesized by one pot base catalyzed cyclocondensation reaction of 1H-pyrazole-4-carbaldehyde 1a-l, malononitrile 2 and 4-hydroxy-6-methylpyrone 3. All the synthesized compounds were screened against six bacterial pathogens, namely B. subtilis, C. tetani, S. pneumoniae, S. typhi, V. cholerae, E. coli and antifungal activity against, two fungal pathogens, A. fumigatus and C. albicans using broth microdilution MIC method. Some of the compounds are found to be equipotent or more potent than that of commercial drugs, against most of employed strains.

Select

Synthesis of 2-arylbenzimidazoles and 2-arylbenzothiazoles in both room temperature and microwave condition catalyzed by hexamethylenetetramine-bromine complex

Kaveh Khosravi, Samira Kazemi

中国化学快报. 2012, 23(01): 61-64. https://doi.org/10.1016/j.cclet.2011.09.028

摘要 ( )

PDF全文 ( )

可视化

One-pot condensation of 2-aminothiophenol or 1,2-phenylenediamine with different aldehydes has been catalyzed by hexamethylenetetramine-bromine (HMTA-Bromine) as new, available and effective catalyst. 2-Arylbenzo-thiazoles and 2-aryl-benzimidazoles have been achieved in excellent yield and good purity.

Select

Three-component synthesis of amidoalkyl naphthols catalyzed by bismuth (III) nitrate pentahydrate

Min Wang, Yan Liang, Ting Ting Zhang, Jing Jing Gao

中国化学快报. 2012, 23(01): 65-68. https://doi.org/10.1016/j.cclet.2011.10.008

摘要 ( )

PDF全文 ( )

可视化

Bismuth(Ⅲ) nitrate pentahydrate catalyzed the three-component condensation of β-naphthol, aldehydes and amines/urea under solvent-free conditions to afford the corresponding amidoalkyl naphthols in excellent yields.

Select

Synthesis and crystal structure of polyaryl substituted diene derivatives based on the reduction of diphenylacetylene with lithium naphthalenide

Shu Hong Li, Liang Chun Li, Cai Hong Xu

中国化学快报. 2012, 23(01): 69-72. https://doi.org/10.1016/j.cclet.2011.10.009

摘要 ( )

PDF全文 ( )

可视化

The reduction of diphenylacetylene with lithium naphthalenide produced two kinds of intermediates, 1 or 2, depending on the ratio of diphenylacetylene to lithium naphthalenide. A series of polyaryl substituted ethylene/diene derivatives were synthesized by reaction of electrophiles with the corresponding intermediates produced in-situ. All new compounds were fully characterized, and their single crystal structures were determined.

Select

Rare earth metal triflates catalyzed electrophilic nitration using N₂O₅

Xiao Ming Ma, Bin Dong Li, Ming Lu, Chun Xu Lv

中国化学快报. 2012, 23(01): 73-76. https://doi.org/10.1016/j.cclet.2011.09.021

摘要 ( )

PDF全文 ( )

可视化

A mild, efficient and eco-friendly process for the electrophilic nitration is described using N₂O₅ as a green nitrating agent in the presence of rare earth metal triflates[RE(OTf)₃] under mild conditions.

Select

Phosphine-free conversion of alcohols into alkyl thiocyanates using trichloroisocyanuric acid/NH₄SCN

Roya Azadi, Babak Mokhtari, Mohamad-Ali Makaremi

中国化学快报. 2012, 23(01): 77-80. https://doi.org/10.1016/j.cclet.2011.09.022

摘要 ( )

PDF全文 ( )

可视化

A convenient and efficient phosphine-free procedure for the one-pot conversion of primary, secondary and tertiary alcohols into the corresponding alkyl thiocyanates or alkyl isothiocyanates is described using trichloroisocyanuric acid/NH₄SCN.

Select

A novel approach towards dethioacetalization reactions with H₂O₂-SOCl₂ system

Kiumars Bahrami, Mohammad Mehdi Khodaei, Maryam Tajik, Vida Shakibaian

中国化学快报. 2012, 23(01): 81-85. https://doi.org/10.1016/j.cclet.2011.09.011

摘要 ( )

PDF全文 ( )

可视化

A simple and efficient protocol for the deprotection of dithioacetal, 1,3-dithianes and 1,3-dithiolanes has been developed using H₂O₂-SOCl₂ reagent system. In addition to the absence of overoxidation products for oxidation-prone substrates, high chemoselectivity, the low cost and availability of the reagents, simplicity of the method, short reaction times, and excellent yields can also be considered as strong points for this method.

Select

Generation/collection mode of SECMwith combined probe

Wei Wang, Jie Zhang, LianHuan Han, DeZhi Yang, Dong Ping Zhan

中国化学快报. 2012, 23(01): 86-88. https://doi.org/10.1016/j.cclet.2011.09.015

摘要 ( )

PDF全文 ( )

可视化

Here we report a novel generation/collection operation mode of scanning electrochemical microscopy, in which a theta micropipette was employed to support two adjacent water/1,2-dichloroethane interfaces separated by the thin central glass wall:one acts as the generator while the other as the collector. The generation current, collection current andcollection efficiencywere enhanced significantly when the tip approached to an insulate substrate.

Select

NMR identification of anti-influenza lead compound targeting at PA_C subunit of H5N1 polymerase

Lin Li, Sheng Hai Chang, Jun Feng Xiang, Qian Li, Huan Huan Liang, Ya Lin Tang, Ying Fang Liu

中国化学快报. 2012, 23(01): 89-92. https://doi.org/10.1016/j.cclet.2011.09.006

摘要 ( )

PDF全文 ( )

可视化

PA_C subunit from avian influenza (H5N1) viral RNA polymerase was used in this work as a target in the screening for anti-influenza agents from licorice-derived compounds. As a result, 18β-glycyrrhetinic acid was suggested to be PA_C ligand by flexible docking, and was then confirmed by relaxation-edited NMR. The result of ApG primer extension assay indicated that this PA_C ligand can inhibit the polymerase activity, and thus may potentially be valuable as anti-influenza lead compound. This work validated the possibility of screening polymerase inhibitors by using PA_C as a target, and provided a starting point for the further discovery of new anti-influenza drugs.

Select

A novel dithiourea and its response to metal ions

Lu Yuan, Hong Zhong, Li Qing Li, Jing Jing Xiao

中国化学快报. 2012, 23(01): 93-96. https://doi.org/10.1016/j.cclet.2011.09.009

摘要 ( )

PDF全文 ( )

可视化

The synthesis, characterization, and its response to metal ions of a novel thiourea N, N'-diethoxycarbonyl-N'', N'''-(1, 2-ethylidene) dithiourea was reported. The results show that this dithiourea with new structure can react with Cu²⁺ and Ni²⁺ separately, and has a best selectivity to Fe³⁺ ions. Bench-scale flotation tests were also carried out, verifying it has higher copper flotation recovery and better selectivity to sulfide ores containing Cu compared with universal collectors.

Select

A novel positively thermo-sensitive hydrogel based on ethylenediaminetetraacetic dianhydride and piperazine:Design, synthesis and characterization

Jiao Xia Sun, Yuan Liang Wang, Shu Hua Dou

中国化学快报. 2012, 23(01): 97-100. https://doi.org/10.1016/j.cclet.2011.09.023

摘要 ( )

PDF全文 ( )

可视化

A new positively thermo-sensitive hydrogel was designed and synthesized by a condensation polymerization reaction of ethylenediaminetetraacetic dianhydride (EDTAD) and piperazine (PA) to give poly (ethylenediaminetetraacetic dianhydride-co-piperazine) (PEP). The obtained polymers' structure was characterized by FTIR and ¹³C NMR. The backbone of the polymer linked by amide bond and abundant of carboxyl groups as pendant group could form strong intermolecular and intramolecular hydrogen bond at lower temperature and dissociate at higher temperature, resulting in the polymer with thermo-sensitivity. The aqueous solution of PEP at lower temperature (< 20℃) showed micro-gel formation and transformed to transparent solution at higher temperature (> 40℃). Transition temperature shifted to higher value with the increasing of concentration. The hydrogel exhibited reversible phase transition and the transmittance change was not weakened by multiple temperature changes.

Select

Stripping dispersion hollow fiber liquid membrane containing carrier PC-88A and HNO₃ for the extraction of Sm³⁺

Liang Pei, Li Ming Wang, Wei Guo

中国化学快报. 2012, 23(01): 101-104. https://doi.org/10.1016/j.cclet.2011.09.013

摘要 ( )

PDF全文 ( )

可视化

Stripping dispersion hollow fiber liquid membrane system (SDHFLM) containing feed phase adding acetate buffer solution and dispersion solution with HNO₃ solution as the stripping solution and membrane solution of 2-ethyl hexyl phosphoric acid-mono-2-ethylhexyl ester (PC-88A) dissolved in kerosene, has been studied for the extraction of Sm³⁺. Many factors including pH value, volume ratio of membrane solution to stripping solution (O/W) and carrier concentration on Sm³⁺ extraction were investigated. Experimental results indicate that the optimum extraction conditions of Sm³⁺ were obtained as that PC-88A concentration was 0.120 mol/L, and O/W was 1.00 in the dispersion phase, and pH value was 4.80 in the feed phase. When initial Sm³⁺ concentration was 1.20×10^-4 mol/L, the extraction percentage of Sm³⁺ was up to 92.8% in 160 min.

Select

Fast removal of heavy metal ions and phytic acids from water using new modified chelating fiber

Li Xu, Jin Nan Wang, Ying Meng, Ai Min Li

中国化学快报. 2012, 23(01): 105-108. https://doi.org/10.1016/j.cclet.2011.09.029

摘要 ( )

PDF全文 ( )

可视化

The graft copolymerization of acrylic acid (AA) onto polyethylene glycol terephthalate (PET) fiber initiated by benzoy peroxide (BPO) was carried out in heterogeneous media. Moreover, modification of the grafted PET fiber (PET-AA) was done by changing the carboxyl group into acylamino group through the reaction with dimethylamine. The modified chelating fiber (NDWJN1) was characterized using elementary analysis, SEM and FT-IR spectroscopy. Adsorption kinetic curves indicated that NDWJN1 could fast remove heavy metal ions and phytic acids from water effectively. Furthermore, batch kinetic studies indicated that heavy metal ions adsorbed to NDWJN1 could be fitted well by both pseudo-first-order and pseudo-second-order adsorption equations, but the intra-particle diffusion played a dominant role in the adsorption of phytic acids.

Select

A novel infrared spectrophotometric method for the rapid determination of petroleum hydrocarbons, and animal and vegetable oils in water

Song Lin Tang, Yong Zhang, Sheng Zhong, Ai Min Li

中国化学快报. 2012, 23(01): 109-112. https://doi.org/10.1016/j.cclet.2011.10.010

摘要 ( )

PDF全文 ( )

可视化

To determine the concentrations of total oils, petroleum hydrocarbons, and animal and vegetable oils in water, the conventional analytical methods involve two scans as well as a step of magnesium silicate adsorption to remove the animal and vegetable oils in water samples. In this study, a novel analytical method was developed to determine the above oils in wastewater samples through just one scan-the concentration of animal and vegetable oils, and that of total oils were determined by measuring the absorbance of the > C=O bond in the peak area between 1750 cm^-1 and 1735 cm^-1, and of the C-H bond at 2930 ^-1, 2960 cm^-1, and 3030 cm^-1, respectively. The concentration of petroleum hydrocarbons was then calculated by subtracting the concentration of animal and vegetable oils from that of total oils. Compared with the well-known analytical method GB/T 16488-1996, the novel approach displayed similar accuracy in the quantitative determination of oils in wastewater samples, but significantly reduced material cost and operation time.

Select

Activation in the initial stage of oxygen permeation in SrCo_0.9Ta_0.1O_3-δ

Yan Ying Wei, Ling Yi Zhou, Jun Tang, Zhong Li, Hai Hui Wang

中国化学快报. 2012, 23(01): 113-116. https://doi.org/10.1016/j.cclet.2011.09.020

摘要 ( )

PDF全文 ( )

可视化

Mixed conducting perovskite oxide SrCo_0.9Ta_0.1O_3-δ (SCT) is synthesized by solid-state reaction method. The activation in the initial stage of oxygen permeation through the SCT membrane is investigated. The results show that the activation in the initial stage of oxygen permeation has activate-memory, the first activation can only help to reduce active time of the next cycles, but it is helpless to increase the final oxygen permeation flux. XRD characterization shows that the imperfect perovskite phase structure is gradually improved and the crystal lattice has made some self-adjustment under the permeation conditions, therefore, the oxygen permeation flux of SCT disk membrane increases gradually and till it reaches a steady state.

Select

Visible to ultraviolet up-conversion in a novel rare earth-free up-converting phosphor

En Zhou Liu, Jun Fan, Xiao Yun Hu, Wen Qian Hou, Hong Zhe Dai

中国化学快报. 2012, 23(01): 117-120. https://doi.org/10.1016/j.cclet.2011.09.026

摘要 ( )

PDF全文 ( )

可视化

A novel up-converting phosphor, Na_xAl,_yF_x+3y/CaF₂ (0.3 < x < 0.5, 0 < y < 0.1) composite, is prepared by a hydrothermal process at 180℃ and an annealing treatment at 500℃. X-ray diffraction (XRD) pattern indicates that Na_xAl_yF_x+3y/CaF₂ is a composite consisting of NaF, Na₃AlF₆, and CaF₂. The up-conversion luminescence properties of this phosphor are investigated by fluorescence spectrometer. Results show that Na_xAl_yF_x+3y/CaF₂ exhibits visible-to-ultraviolet up-conversion luminescence properties. The emission peaks at 316 and 336 nm are observed when excited by 610 nm, the luminescence lifetime of the emissions is great than 18 ms, and the internal fluorescence quantum yield is 4.2%. Additionally, the luminescent mechanism of this phosphor is also mentioned.

Select

Novel organosoluble polyimide based on an asymmetric bis(ether amine):3, 4'-Bis(4-aminophenoxy)-benzophenone

Qian Qian Bu, Shu Jiang Zhang, Hui Li, Yan Feng Li

中国化学快报. 2012, 23(01): 121-122. https://doi.org/10.1016/j.cclet.2011.09.014

摘要 ( )

PDF全文 ( )

可视化

A new kind of asymmetrical ether diamine, 3, 4'-bis(4-aminophenoxy)benzophenone (BABP), was synthesized from the nucleophilic substitution reaction of 4-chloronitrobenzene and 3, 4'-dihydroxybenzophenone in the presence of potassium carbonate, followed by catalytic reduction with SnCl2·6H₂O and concentrated hydrochloric acid. The prepared diamine was employed in the preparation of a novel polyimide containing asymmetrical diaryl ether segments via the polycondensation of it with BTDA by a two-step method. The resulting polyimide exhibits excellent solubility, film-forming capability and high thermal resistance.

Select

Synthesis of the water-compatible p-acetaminophen resin and its adsorption performances for vanillin in aqueous solution

Gu Qing Xiao, Li Ping Long, Jiao Liang Wang

中国化学快报. 2012, 23(01): 123-126. https://doi.org/10.1016/j.cclet.2011.10.007

摘要 ( )

PDF全文 ( )

可视化

A novel p-acetaminophen resin (named as GQ-1) was synthesized with chloromethylated polystyrene and p-acetaminophen. It can be used without any wetting process. The objective of this work was to study the adsorption performances for vanillin onto GQ-1 with two kinds of the hydrogen bond site of acetamino group and hydroxyl group. The results showed that the adsorption property of vanillin onto GQ-1 was superior to XAD-4, H103, NDA150, and NDA88. The adsorption capacity of vanillin onto GQ-1 is not greatly discrepant until the solution pH is higher than 5.31. The saturated adsorption quantity of vanillin was up to 141.32 mg/mL (wet resin) according to the dynamic adsorption and desorption experiments at 293 K. The resin could be regenerated by 7 BV ethanol.

选择文件类型/文献管理软件名称

选择包含的内容

本期目录

2012年, 第23卷, 第01期　刊出日期：2012-01-20

选择文件类型/文献管理软件名称

选择包含的内容

本期目录

2012年, 第23卷, 第01期 刊出日期：2012-01-20

2012年, 第23卷, 第01期　刊出日期：2012-01-20