International Letters of Chemistry, Physics and Astronomy最新文献_第6页

Photophysics of Caffeic, Ferulic and Sinapic Acids with α- and β-Cyclodextrins: Spectral and Molecular Modeling Studies 咖啡酸、阿魏酸和辛酸与α-和β-环糊精的光物理:光谱和分子模拟研究

International Letters of Chemistry, Physics and Astronomy Pub Date : 2017-01-27 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.72.37

N. Rajendiran, T. Mohandoss, J. Thulasidhasan

{"title":"Photophysics of Caffeic, Ferulic and Sinapic Acids with α- and β-Cyclodextrins: Spectral and Molecular Modeling Studies","authors":"N. Rajendiran, T. Mohandoss, J. Thulasidhasan","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.72.37","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.72.37","url":null,"abstract":"Encapsulation of caffeic acid (CAA), ferulic acid (FEA) and sinapic acid (SIA) molecules with α-CD and β-CD was studied by UV-visible, fluorescence, time-resolved fluorescence and molecular modelling techniques. This analysis reports the probing of cyclodextrin (CD) cavities with the help of dual emission properties of the above hydroxycinnamic acids (HCAs) in aqueous solution. The normal Stokes shifted bands originated from the locally excited state and the large Stokes shifted bands due to the emission from an intramolecular charge transfer (ICT) state were observed. The ratio of the TICT emission to the normal emission increased with α-CD and β-CD concentration. CD studies indicates (i) HCAs forms 1:1 inclusion complex and (ii) acrylic group present in the interior part of the CD cavity and OH/OCH3 groups present in the upper part of the CD cavity. pH studies suggest proton transfer reactions follow the same trend in these molecules. A mechanism is proposed to explain the inclusion process. PM3 optimizations were also carried out to assign the encapsulation of the HCA molecules.","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90728893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Studies of Sorbent Efficiencies of Maize Parts in Fe(II) Removal from Aqueous Solutions 玉米部分对水中铁(II)的吸附效率研究

International Letters of Chemistry, Physics and Astronomy Pub Date : 2017-01-27 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.72.1

C. Duru, I. Duru

引用次数: 6

Retraction Notice: F.O. Alao, T.A. Adebayo, Comparative Efficacy of Tephrosia vogelii and Moringa oleifera against Insect Pests of Watermelon (Citrullus lanatus Thumb), International Letters of Chemistry, Physics and Astronomy, Vol. 51, pp. 5-12, 2015 撤稿通知:F.O. Alao, T.A. Adebayo，辣木对西瓜(Citrullus lanatus Thumb)害虫的防治效果比较，国际化学物理天文学报，Vol. 51, pp. 5-12, 2015

International Letters of Chemistry, Physics and Astronomy Pub Date : 2017-01-27 DOI: 10.18052/www.scipress.com/ilcpa.72.65

T. A. A. F. O. Alao

引用次数: 0

Impact of Etching Time on Ideality Factor and Dynamic Resistance of Porous Silicon Prepared by Electrochemical Etching (ECE) 蚀刻时间对电化学蚀刻多孔硅理想系数和动态电阻的影响

International Letters of Chemistry, Physics and Astronomy Pub Date : 2017-01-27 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.72.28

H. Hadi

引用次数: 5

Molecular Structure, Vibrational Spectra and Docking Studies of Abacavir by Density Functional Theory 用密度泛函理论研究阿巴卡韦的分子结构、振动光谱及对接

International Letters of Chemistry, Physics and Astronomy Pub Date : 2017-01-27 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.72.9

R. Solaichamy, J. Karpagam

引用次数: 7

Synthesis and Bio-Evaluation of Novel N-(4-(8-Methoxy-2-Oxo-2H-Chromen-3-Yl) Thiazol-2-Yl) Amide Derivatives 新型N-(4-(8-甲氧基-2-氧基- 2h -铬-3-基)噻唑-2-基)酰胺衍生物的合成及生物评价

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-11-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.71.19

Nilay Shah, P. N. Patel, D. Rajani, Denish C. Karia

引用次数: 0

Synthesis and Characterization of Ba0.96Sr0.04Ce0.7Zr0.3O3 Solid Oxide Fuel Cell Electrolyte by Citrate EDTA Complexing Sol-Gel Process 柠檬酸EDTA络合溶胶-凝胶法制备Ba0.96Sr0.04Ce0.7Zr0.3O3固体氧化物燃料电池电解质及表征

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-11-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.71.1

J. Sailaja, N. Murali, K. Samatha, V. Veeraiah

{"title":"Synthesis and Characterization of Ba0.96Sr0.04Ce0.7Zr0.3O3 Solid Oxide Fuel Cell Electrolyte by Citrate EDTA Complexing Sol-Gel Process","authors":"J. Sailaja, N. Murali, K. Samatha, V. Veeraiah","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.71.1","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.71.1","url":null,"abstract":"This paper reports on the effect of Strontium doping on BaCe0.7Zr0.3O3 electrolyte prepared using the citrate-EDTA complexing sol-gel process at temperature T=1000°C. The phase formation and evolution with the temperature has been studied by X-ray diffraction (XRD), thermal analysis (TG-DTA).The morphology of the sintered powder at T=1300°C are examined by SEM - Scanning Electron MicroscopyEDAX - Energy-dispersive X-ray spectroscopy analysisFTIR - Fourier transforms infrared spectrometer FTRS-Raman measurementsThe crystallite size of the ceramic powders calculated from Scherrer equation is 28nm and the diffraction peak shifted to higher angles. Microstructure of the sintered powder revealed that the average grain size is in the range of 2mm. The incorporation of Sr is found to suppress the formation of CeO2 like second phase and enhance the grain growth in sintered oxides. Dense ceramic materials were obtained at 1300°C and the relative density is 80% of the theoretical density. FTIR and Raman measurements reveal the complete single phase formation of the orthorhombic perovskite structure. The ionic conductivity of the pellet is investigated from room temperature to 400°C and is found to be 1.1x10-4S/cm (400°C). The conductivity increased as temperature increases and the activation energies is 0.48eV and hence this composition qualifies to be a promising electrolyte.","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72785898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Study of the Properties of the Porous Silicon Synthesized by Ag Assisted Chemical Etching 银辅助化学蚀刻合成多孔硅的性能研究

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-11-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.71.40

Madhavi Karanam, G. M. Rao, S. Habibuddin, R. Padmasuvarna

引用次数: 3

Purification of Nitrate Contaminated Aqueous Solution Using Modified and Unmodified Palmkernel Shell 改性和未改性棕榈仁壳净化硝酸盐污染水溶液的研究

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-11-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.71.11

O. L. Adebayo, A. A. Adaramodu, M. G. Ajayi, F. E. Olasehinde, J. Oyetunde

{"title":"Purification of Nitrate Contaminated Aqueous Solution Using Modified and Unmodified Palmkernel Shell","authors":"O. L. Adebayo, A. A. Adaramodu, M. G. Ajayi, F. E. Olasehinde, J. Oyetunde","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.71.11","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.71.11","url":null,"abstract":"The adsorption capacity of Palmkernel shell (PKS) which was used as an adsorbent in this study were boosted by acid thermoactivation. The nitrate sorption potential, point zero charge (PZC) and surface area of the PKS were enhanced by the acid thermoactivation process. The process of sorption of nitrate from solution was analyzed using five different isotherm models [Langmuir, Freundlich, Temkin, Harkins-Jura, and Halsey isotherm equations]. The value of the Langmuir monolayer sorption capacity qm [mg/g] increased from 60.12 to 85.73, PZC values increased from 5.50 to 8.40, and the surface area [m2/g] value increased from 29 m2/g to 98 m2/g after the activation process. The effect of pH on the sorption of the nitrate on both sorbents was also considered and it was discovered that the adsorption of nitrate decreases with increase in nitrate solution pH. The effects of the sorbents dose on the sorption process was also studied and the results showed that the amount of nitrate sorbed by both sorbent decreases with increase in sorbent dose.","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"103 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81759882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

A Novel Use of 3-Methyl-2-Benzothiazolinone Hydrazone Hydrochloride Monohydrate for Kinetic Spectrophotometric Determination of Captopril in Pharmaceutical Formulations 3-甲基-2-苯并噻唑啉酮盐酸盐一水合物动力学光度法测定卡托普利

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-11-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.71.29

Mouhammed Khateeb, Bashir Elias, Shahama Adi

引用次数: 1