Journal of the Chemical Society, Faraday Transactions最新文献

Very low pressure pyrolysis of phenylacetic acid 苯基乙酸的极低压热解

Journal of the Chemical Society, Faraday Transactions Pub Date : 2010-08-21 DOI: 10.1039/FT9928802125

A. Colussi, V. Amorebieta, M. A. Grela

引用次数: 4

Photophysics and photoreactivity of substituted thioxanthones 取代硫代蒽酮的光物理和光反应性

Journal of the Chemical Society, Faraday Transactions Pub Date : 2010-08-03 DOI: 10.1039/A607264J

M. Neumann, M. Gehlen, M. Encinas, N. Allen, T. Corrales, C. Peinado, F. Catalina

引用次数: 67

Hydrogen bonding Part 44 Thermodynamics of complexation of 3,5-dichlorophenol with ketones and ethers in cyclohexane: the Badger–Bauer relationship 环己烷中3,5-二氯苯酚与酮和醚络合的热力学:Badger-Bauer关系

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-12-01 DOI: 10.1039/A708362I

M. Abraham, David V. Prior, R. A. Schulz, J. J. Morris, P. J. Taylor

{"title":"Hydrogen bonding Part 44 Thermodynamics of complexation of 3,5-dichlorophenol with ketones and ethers in cyclohexane: the Badger–Bauer relationship","authors":"M. Abraham, David V. Prior, R. A. Schulz, J. J. Morris, P. J. Taylor","doi":"10.1039/A708362I","DOIUrl":"https://doi.org/10.1039/A708362I","url":null,"abstract":"Equilibrium constants for 1 : 1 hydrogen bond complexation between 3,5-dichioropheno' (DCP) and 17 ketones and 12 ethers in cyclohexane solution have been obtained by an FTIR method that takes into account both diiaerization of the acid and formation of 2 :1 complexes. Enthalpies of complexation for the same ketones and ethers have been determined by a calorimeiric method, leading to values of log K, AG, AH and AS0 for 1 :1 complexation in the 29 systems, as well as log K2 for the 2 :1 complexation between 2 mol of acid and 1 mol of base. For the ketone systems there is very little variation in the three thermodynamic parameters with alkyl substitution, but for the ethers there are systematic variations depending on the alkyl substituent or if the ethers are cyclic. Values of the OH stretching frequency in the DCP complexes with the ketones and ethers in cyclohexane have been obtained. The band shapes for the DCP-ketone complexes are very asymmetric, possibly due to the presence of stereoisomeric complexes, but the VOH band for DCP-ether complexes is symmetric and very suitable for the evaluation of any relationship between v()H and A/f. It is found that for the complexation of DCP with the 12 aliphatic ethers in cyclohexane, there is almost no connection between the calorimetrically determined AH° values and values of AvOH.","PeriodicalId":17286,"journal":{"name":"Journal of the Chemical Society, Faraday Transactions","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76763188","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: 12

IR spectroscopy of small and weakly interacting molecular probes for acidic and basic zeolites 酸性和碱性沸石小分子和弱相互作用探针的红外光谱

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-10-13 DOI: 10.1039/A802189I

H. Knözinger, S. Huber

{"title":"IR spectroscopy of small and weakly interacting molecular probes for acidic and basic zeolites","authors":"H. Knözinger, S. Huber","doi":"10.1039/A802189I","DOIUrl":"https://doi.org/10.1039/A802189I","url":null,"abstract":"The application of small and weakly interacting probe molecules for the characterization of acidic and basic properties by FTIR spectroscopy is exemplified by using H- and alkali cation-exchanged zeolites as typical solid Bronsted and Lewis acids and Lewis bases. Criteria for the selection of probe molecules are given. Bronsted acidity can be characterized by the H-bonding method when CO and N2 are used as molecular probes. Quantum chemical calculations are shown to provide important additional information on the electronic nature of the adsorption interaction and the vibrational behaviour of the probe molecule. Lewis acidity dominates in cation-exchanged zeolites for small cations (Li+, Na+) whereas basic properties develop with increasing cation radius. CO, CO2, N2 and CH4 interact with cation centers, the interaction energy decreasing with increasing cation radius. CO at very low equilibrium pressures permits a siting of Na+, and the Al distribution in six-rings (SII-sites) can be probed. CH4 interacts with cations in the M+···H3CH configuration having C3v symmetry. CH-acids such as Cl3CH(D), acetylene and methylacetylene, are shown to be potentially suitable probe molecules for basic properties using the H-bonding method. All three molecules undergo Oz2−···H–C H-bonding and the induced red-shift of the C–H stretching frequency permits a ranking of the base strength of a given series of materials.","PeriodicalId":17286,"journal":{"name":"Journal of the Chemical Society, Faraday Transactions","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75056947","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: 286

Electron transfer in proteins 蛋白质中的电子转移

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-06-10 DOI: 10.1039/F29837901375

S. Larsson

引用次数: 99

Titration microcalorimetry of adsorption processes in aqueous systems 水系统中吸附过程的滴定微量热法

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-21 DOI: 10.1039/A704667G

M. J. Blandamer, B. Briggs, P. Cullis, Keith D. Irlam, J. Engberts, J. Kevelam

{"title":"Titration microcalorimetry of adsorption processes in aqueous systems","authors":"M. J. Blandamer, B. Briggs, P. Cullis, Keith D. Irlam, J. Engberts, J. Kevelam","doi":"10.1039/A704667G","DOIUrl":"https://doi.org/10.1039/A704667G","url":null,"abstract":"Procedures are described for analysing enthalpograms characterising adsorption by macromolecules in solution recorded using a titration microcalorimeter. The experimental procedure involves injecting small aliquots of a solution containing adsorbate into a sample cell containing a solution of macromolecular adsorbent. Treatments based on both Langmuir and Frumkin adsorption isotherms are described. The procedures are illustrated by application of the derived equations to the interaction of micelles of sodium dodecylsulfate(aq) and of sodium decylsulfate(aq) with the water-soluble polymer, PVP. The dominant features in the recorded enthalpograms are described using equations developed from the Frumkin equation. In both cases the adsorption is endothermic attributed to hydrophobic interactions between polymer and surfactant. However, an important feature of the analysis is the characterisation of adsorbate–adsorbate interactions using enthalpic interaction parameters. The enthalpograms are characterised by three composition ranges: (i) micelle deaggregation and weak interaction of monomers with polymer, (ii) micelle adsorption on to the soluble polymer up to surface saturation and (iii) micelle dilution.","PeriodicalId":17286,"journal":{"name":"Journal of the Chemical Society, Faraday Transactions","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78372702","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: 26

Influence of the layer charge density of smectites on the interaction with methylene blue 蒙脱石层电荷密度对与亚甲基蓝相互作用的影响

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A805341C

J. Bujdák, M. Janek, J. Madejová, P. Komadel

{"title":"Influence of the layer charge density of smectites on the interaction with methylene blue","authors":"J. Bujdák, M. Janek, J. Madejová, P. Komadel","doi":"10.1039/A805341C","DOIUrl":"https://doi.org/10.1039/A805341C","url":null,"abstract":"Six Na-saturated smectites were isolated from bentonites of various deposits. Their H-forms were prepared using H–OH–H resins. The interaction of methylene blue (MB) (0.05 mmol g-1) with Na-saturated untreated and H-autotransformed clay samples was investigated by the VIS spectroscopy of their dispersions. The spectra provided information about the formation of protonated dye cations, dimers, and higher agglomerates on the clay surface. The amounts of various dye forms were compared with the distributions of negative layer charge of the used clays, obtained by the alkylammonium method. Formation of MB dimers and higher agglomerates reflected sensitively the layer charge density of the smectites. MB cations formed predominantly higher agglomerates at the surface of those smectites with high charge density. Suppressed dye agglomeration was observed for the samples of lower layer charge density and was caused by greater distances between the adsorbed MB cations. Due to the high sensitivity of MB agglomeration on the layer charge and the simplicity of the method, MB–clay interaction can potentially be utilized for the layer charge characterization of smectites.","PeriodicalId":17286,"journal":{"name":"Journal of the Chemical Society, Faraday Transactions","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74037437","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: 63

Solution and co-ordination enthalpies (solid state) of lithium and sodium macrocycle (ethyl p-tert-butylcalix(4)arene tetraethanoate, cryptand 222 and crown ethers) systems 锂和钠大环(乙基对叔丁基杯(4)芳烃四乙酸酯，隐式和222冠醚)体系的溶液和配位焓(固态)

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A805190I

A. F. Namor, L. E. P. Salazar, M. A. L. Tanco, D. Kowalska, Jose A. Villanueva Salas, R. A. Schulz

{"title":"Solution and co-ordination enthalpies (solid state) of lithium and sodium macrocycle (ethyl p-tert-butylcalix(4)arene tetraethanoate, cryptand 222 and crown ethers) systems","authors":"A. F. Namor, L. E. P. Salazar, M. A. L. Tanco, D. Kowalska, Jose A. Villanueva Salas, R. A. Schulz","doi":"10.1039/A805190I","DOIUrl":"https://doi.org/10.1039/A805190I","url":null,"abstract":"A series of lithium and sodium ethyl p-tert-butylcalix(4)arene tetraethanoate and cryptand 222 salts has been isolated and thermochemically characterised in acetonitrile at 298.15 K. Also reported are the standard enthalpies of solution of common sodium salts (tetrafluoroborate, trifluoromethanesulfonate, iodide and bromide) in this solvent at the same temperature. Solution data for the free and the complexed salts and for the ligand are combined with complexation data for the appropriate cation and macrocycle in acetonitrile to derive the enthalpies of co-ordination of these systems for the process where the product and the reactants are in the solid state. Comparison of data involving lithium and the calix(4)arene ester and the cryptand 222 with those for crown ethers reflects considerable weakening of cation–anion interactions in the former ligands relative to crown ethers. It is concluded that for a given ligand and metal cation, the anion effect is reflected in the co-ordination enthalpies. On the other hand, for systems containing the same ligand and anion, there is a decrease in enthalpic stability in moving from lithium to sodium. The need to obtain experimental data on crystal lattice enthalpies of these ligands and their metal ion complex salts is emphasised.","PeriodicalId":17286,"journal":{"name":"Journal of the Chemical Society, Faraday Transactions","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75230306","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: 8

Adsorption induced phase transition of ZSM-5 by p-xylene 对二甲苯吸附诱导ZSM-5的相变

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A705942F

T. Takaishi, K. Tsutsumi, K. Chubachi, A. Matsumoto

引用次数: 27

Photophysical properties of bis(2,2′-bithiophene-5-yl)benzenes 双(2,2 ' -二噻吩-5-基)苯的光物理性质

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A802514B

Tadatake Sato, Kiyotaka Hori, M. Fujitsuka, A. Watanabe, O. Ito, Kazuyoshi Tanaka

引用次数: 16