Advances in Physical Chemistry最新文献_第4页

Effect of Concentration on Isomerization of Rhodanine Derivatives of Merocyanine Dyes in Polar Solvents 浓度对甲基蓝染料罗丹宁衍生物极性溶剂异构化的影响

Advances in Physical Chemistry Pub Date : 2014-08-27 DOI: 10.1155/2014/468910

O. Dimitriev, K. Grytsenko, O. I. Tolmachev, Y. Slominskii, M. Kudinova, S. Schrader

{"title":"Effect of Concentration on Isomerization of Rhodanine Derivatives of Merocyanine Dyes in Polar Solvents","authors":"O. Dimitriev, K. Grytsenko, O. I. Tolmachev, Y. Slominskii, M. Kudinova, S. Schrader","doi":"10.1155/2014/468910","DOIUrl":"https://doi.org/10.1155/2014/468910","url":null,"abstract":"Rhodanine derivatives of merocyanine dyes with residues of 1,3,3-trimethyl-3H-indole and 3-ethylbenzothiazoline have been found to possess two molecular forms in diluted solutions of polar solvents such as dimethylformamide, dimethyl sulfoxide, and N-methylpyrrolidinone. The first molecular form was observed to prevail at low concentrations of the dyes, normally up to 10−5 M. The second one prevails at higher concentrations and is displayed through a new band in the electronic absorption spectrum, which is red-shifted with respect to the absorption band of the first form. No similar effect was found for these dyes by use of nonpolar solvents or upon alkyl-substitution of the molecules at nitrogen atom in the rhodanine moiety. We assign the above two forms to different molecular isomers and the analogous spectral changes were shown to take place by light or heat influence which correspond to a typical isomerization effect for the related merocyanine dyes. It is discussed that the isomer transformation is facilitated by the increased mobility of the proton bonded to the nitrogen atom of the rhodanine moiety in the polar environment and the increased amount of dye-dye collisions.","PeriodicalId":7371,"journal":{"name":"Advances in Physical Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90535529","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: 1

Ruthenium(III) Catalysis in Perborate Oxidation of 5-Oxoacids 钌(III)在5-氧酸过硼酸盐氧化中的催化作用

Advances in Physical Chemistry Pub Date : 2014-08-24 DOI: 10.1155/2014/879608

S. Devi, P. Krishnamoorthy, B. Muthukumaran

引用次数: 1

Full Kinetics and a Mechanistic Investigation of the Green Protocol for Synthesis of β-Aminoketone in the Presence of Saccharose as a Catalyst by a One-Pot Three-Component Reaction 一锅三组分催化合成β-氨基酮绿色方案的全动力学和机理研究

Advances in Physical Chemistry Pub Date : 2014-06-16 DOI: 10.1155/2014/426749

S. Habibi‐Khorassani, M. Maghsoodlou, M. Shahraki, Sadegh Talaie Far, M. Mousavi

{"title":"Full Kinetics and a Mechanistic Investigation of the Green Protocol for Synthesis of β-Aminoketone in the Presence of Saccharose as a Catalyst by a One-Pot Three-Component Reaction","authors":"S. Habibi‐Khorassani, M. Maghsoodlou, M. Shahraki, Sadegh Talaie Far, M. Mousavi","doi":"10.1155/2014/426749","DOIUrl":"https://doi.org/10.1155/2014/426749","url":null,"abstract":"For the first time, in a green protocol, an investigation of the kinetics and mechanism of the reaction between benzaldehyde 1, 4-chloroanilinne 2, and acetophenone 3 compounds in the presence of saccharose as a catalyst was performed for generating β-aminoketone. For determining the kinetic parameters, the reaction was monitored by using the UV/Vis spectrophotometry technique. The second order rate constant () was automatically calculated by the standard equations contained within the program. In the studied temperature range, the second order rate constant (, ) depended on reciprocal temperature that was in good consistent with Arrhenius and Eyring equations, respectively. These data provided the suitable plots for calculating the activation energy and parameters (Ea, , , and ) of the reaction. Furthermore, useful information was obtained from studying the effects of solvent, concentration, and catalyst on the reaction mechanism. The results showed that the first step of the reaction mechanism is a rate determining step (RDS). The obtained experimental data and also the steady state assumption confirmed the proposed mechanism.","PeriodicalId":7371,"journal":{"name":"Advances in Physical Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90759452","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: 3

A Development of Ethanol/Percarbonate Membraneless Fuel Cell 乙醇/过碳酸酯无膜燃料电池的研究进展

Advances in Physical Chemistry Pub Date : 2014-05-29 DOI: 10.1155/2014/862691

M. Priya, A. Arun, M. Elumalai, S. Kiruthika, B. Muthukumaran

引用次数: 11

Equilibrium, Kinetics, and Thermodynamics of the Removal of Nickel(II) from Aqueous Solution Using Cow Hooves 用牛蹄从水溶液中去除镍的平衡、动力学和热力学

Advances in Physical Chemistry Pub Date : 2014-05-19 DOI: 10.1155/2014/863173

I. Osasona, O. Ajayi, A. Adebayo

{"title":"Equilibrium, Kinetics, and Thermodynamics of the Removal of Nickel(II) from Aqueous Solution Using Cow Hooves","authors":"I. Osasona, O. Ajayi, A. Adebayo","doi":"10.1155/2014/863173","DOIUrl":"https://doi.org/10.1155/2014/863173","url":null,"abstract":"The feasibility of using powdered cow hooves (CH) for removing Ni2+ from aqueous solution was investigated through batch studies. The study was conducted to determine the effect of pH, adsorbent dosage, contact time, adsorbent particle size, and temperature on the adsorption capacity of CH. Equilibrium studies were conducted using initial concentration of Ni2+ ranging from 15 to 100 mgL−1 at 208, 308, and 318 K, respectively. The results of our investigation at room temperature indicated that maximum adsorption of Ni2+ occurred at pH 7 and contact time of 20 minutes. The thermodynamics of the adsorption of Ni2+ onto CH showed that the process was spontaneous and endothermic. Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models were used to quantitatively analysed the equilibrium data. The equilibrium data were best fitted by Freundlich isotherm model, while the adsorption kinetics was well described by pseudo-second-order kinetic equation. The mean adsorption energy obtained from the D-R isotherm revealed that the adsorption process was dominated by physical adsorption. Powdered cow hooves could be utilized as a low-cost adsorbent at room temperature under the conditions of pH 7 and a contact time of 20 minutes for the removal of Ni(II) from aqueous solution.","PeriodicalId":7371,"journal":{"name":"Advances in Physical Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76694254","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

Plasma Formation during Acoustic Cavitation: Toward a New Paradigm for Sonochemistry 声空化过程中的等离子体形成:迈向声化学的新范式

Advances in Physical Chemistry Pub Date : 2014-05-04 DOI: 10.1155/2014/173878

S. Nikitenko

引用次数: 24

Sorption of Ammonium Ions onto Natural and Modified Egyptian Kaolinites: Kinetic and Equilibrium Studies 天然和改性埃及高岭石对铵离子的吸附:动力学和平衡研究

Advances in Physical Chemistry Pub Date : 2014-04-24 DOI: 10.1155/2014/935854

O. El-Shafey, N. Fathy, T. El-Nabarawy

{"title":"Sorption of Ammonium Ions onto Natural and Modified Egyptian Kaolinites: Kinetic and Equilibrium Studies","authors":"O. El-Shafey, N. Fathy, T. El-Nabarawy","doi":"10.1155/2014/935854","DOIUrl":"https://doi.org/10.1155/2014/935854","url":null,"abstract":"Thermally activated, acid-activated, and acid-leached of thermally activated kaolinites were prepared from the Egyptian ore. The physical and chemical properties were studied using N2 sorption at −196°C, FTIR, SEM, and the total surface acidity. The sorption of ions on the investigated sorbents was controlled with the solution pH, sorbent dosage, and initial concentration of solution. Kinetic and equilibrium sorption at 30°C were employed. Four kinetic models were applied to the kinetic sorption data; pseudo-second-order, Elovich, and intraparticle diffusion models fitted well the kinetic data whereas pseudo-first-order model was less applicable. Elovich parameters refer to physical sorption type of on nonuniform sites and the intraparticle diffusion controls the sorption of by kaolinites to a small extent. The equilibrium sorption data followed Langmuir and D-R models; the negative value of indicates a spontaneous sorption and the mean sorption energy obtained shows also physical sorption. The sorption capacities of nonactivated and activated Egyptian kaolinites towards sorption (10.87–45.45 mg·g−1) were good sorbents as compared with those uptaken by other clays reported in the literature and proved to be more active besides being less expensive and highly available.","PeriodicalId":7371,"journal":{"name":"Advances in Physical Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75830240","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: 15

Dielectric Relaxation Studies of 2-Butoxyethanol with Aniline and Substituted Anilines Using Time Domain Reflectometry 用时域反射法研究2-丁氧基乙醇与苯胺和取代苯胺的介电弛豫

Advances in Physical Chemistry Pub Date : 2014-02-18 DOI: 10.1155/2014/659531

P. Jeevanandham, S. Kumar, P. Periyasamy, A. Kumbharkhane

引用次数: 10

Oxidation of Tetracaine Hydrochloride by Chloramine-B in Acid Medium: Kinetic Modeling 氯胺- b在酸性介质中氧化盐酸丁卡因:动力学模拟

Advances in Physical Chemistry Pub Date : 2014-02-10 DOI: 10.1155/2014/238984

J. P. Shubha, Puttaswamy

引用次数: 4

Controlled Release Kinetics in Hydroxy Double Salts: Effect of Host Anion Structure 羟基重盐的控释动力学:宿主阴离子结构的影响

Advances in Physical Chemistry Pub Date : 2014-01-15 DOI: 10.1155/2014/710487

Stephen Majoni, J. Hossenlopp

引用次数: 4