Journal of the Chemical Society, Faraday Transactions最新文献_第3页

Ion transport activity of calix[n]arene (n=4, 5, 6, 7, 8) esters toward alkali-metal cations in a phospholipid bilayer membrane 磷脂双层膜中杯[n]芳烃(n= 4,5,6,7,8)酯对碱金属阳离子的离子转运活性

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A805101A

T. Jin, M. Kinjo, Yoko Kobayashi, H. Hirata

引用次数: 17

High resolution vibration–rotation spectra of the arsine local mode (110 A1/E) band 砷局部模态(110 A1/E)波段的高分辨率振动-旋转光谱

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A708723C

Shengfu Yang, Hai Lin, Doug Wang, Qing-shi Zhu

引用次数: 4

Protonation and deprotonation energies of uracil Implications for the uracil–water complex 尿嘧啶的质子化和去质子化能对尿嘧啶-水配合物的影响

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A708804C

M. Nguyen, A. K. Chandra

引用次数: 71

Enthalpies of formation of methyl benzenecarboxylates 甲基苯甲酸酯的生成焓

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A800401C

M. Roux, Pilar Jime′nez, J. Dávalos, C. Turrión, H. Afeefy, J. Liebman

{"title":"Enthalpies of formation of methyl benzenecarboxylates","authors":"M. Roux, Pilar Jime′nez, J. Dávalos, C. Turrión, H. Afeefy, J. Liebman","doi":"10.1039/A800401C","DOIUrl":"https://doi.org/10.1039/A800401C","url":null,"abstract":"The relative stabilities of the isomeric dimethyl benzenedicarboxylates have been studied by a thermochemical investigation of dimethyl phthalate, dimethyl isophthalate and dimethyl terephthalate. The enthalpies of formation in the condensed state for dimethyl phthalate and dimethyl isophthalate, determined from combustion calorimetry measurements, are -683.8±2.7 and -730.1±2.0 kJ mol-1, respectively. The enthalpies of sublimation for dimethyl isophthalate and dimethyl terephthalate, determined by the Knudsen effusion technique are 100.9±0.2 and 104.6±0.3 kJ mol-1, respectively. From the above results and the value of the enthalpy of formation in the condensed state of dimethyl terephthalate, previously determined in our laboratory, and the value of the enthalpy of vaporization of dimethyl phthalate taken from the literature, the enthalpies of formation in the gaseous state at 298.15 K for the ortho-, meta- and para-isomers of dimethyl benzenedicarboxylates are found to be -606.1, -629.2±2.0 and -628.0±1.0 kJ mol-1, respectively. The relative stabilities of the isomeric dimethyl benzenedicarboxylates, isomeric dicyanobenzenes and dinitrobenzenes are compared.","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":"84237289","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: 20

Fluorescence properties of electropolymerised 5-substituted indoles in solution 溶液中电聚合5-取代吲哚的荧光性质

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A806721J

P. Jennings, Anita C Jones, A. Mount

引用次数: 13

Real time dielectric spectroscopy and bond connectivity during polymerization of stoichiometric and amine-rich, diepoxide–diamine compositions 实时介电光谱和键连通性在聚合的化学计量和富胺，二氧化二胺组成物

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A800277K

C. Ferrari, E. Tombari, G. Salvetti, G. P. Johari

{"title":"Real time dielectric spectroscopy and bond connectivity during polymerization of stoichiometric and amine-rich, diepoxide–diamine compositions","authors":"C. Ferrari, E. Tombari, G. Salvetti, G. P. Johari","doi":"10.1039/A800277K","DOIUrl":"https://doi.org/10.1039/A800277K","url":null,"abstract":"The dielectric spectra and thermodynamics of macromolecular growth in the diepoxide–diamine liquid mixtures have been studied simultaneously, and in real time, as the original molecular liquid transformed to a rigid state of a vitrified network structure. Both stoichiometric and the excess amine compositions were studied and the dielectric properties of their final polymerized state investigated. The rate of polymerization is remarkably increased in the diamine-rich composition, and vitrification occurs sooner. A change in the rate of heat release profile is attributed to the onset of another reaction at longer times, which does not require the diamine. The dc conductivity, σ0, decreases progressively more rapidly during the initial stage of polymerization, producing a sigmoid shape when it is plotted against time. This shape is stretched out when plots are made against the number of covalent bonds formed. For a fixed number of covalent bonds, n, formed at 324.5 K, the relaxation time, τ0, for the diamine-rich composition is twice that of the stoichiometric composition. Interpretation in terms of the configurational entropy theory shows that this is due to the lowering of vibrational frequencies. The stretched exponential relaxation parameter. β, increases from 0.25 for the stoichiometric to 0.36 for the diamine-rich composition. The product, τ0σ0, increases with increase in n, thus showing that τ0 and σ0 are not inversely related, and that requires consideration of other mechanisms for dc conduction. A faster dipolar reorientation dynamics evolves on polymerization and, in the fully polymerized state of the amine-rich composition, its peak shifts to a lower frequency.","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":"84374691","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: 11

Solvent dependence of triplet energy transfer from triplet benzophenone to naphthols and methoxynaphthalenes 三态二苯酮向萘酚和甲氧基萘转移能量的溶剂依赖性

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A707820J

T. Tanaka, M. Yamaji, H. Shizuka

引用次数: 9

Characterization of Ni/TiO2 catalysts prepared by successive adsorption–reduction of Ni2+ ions Ni2+连续吸附-还原法制备Ni/TiO2催化剂的表征

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A804978E

K. Hadjiivanov, M. Mihaylov, N. Abadjieva, D. Klissurski

{"title":"Characterization of Ni/TiO2 catalysts prepared by successive adsorption–reduction of Ni2+ ions","authors":"K. Hadjiivanov, M. Mihaylov, N. Abadjieva, D. Klissurski","doi":"10.1039/A804978E","DOIUrl":"https://doi.org/10.1039/A804978E","url":null,"abstract":"Three Ni/TiO2 samples have been synthesized by impregnation (sample Ni-i-Ti), adsorption of Ni2+ ions from alkaline media on TiO2 (sample Ni-1-Ti) and on reduced Ni-1-Ti (sample Ni-2-Ti). The samples have been characterized by TPR, IR spectroscopy of adsorbed CO and X-ray diffraction. Impregnation leads to a less homogeneous distribution of the active phase and a negligibly lower temperature of reduction as compared with the adsorption technique. Reduction of Ni-i-Ti results in the formation of nickel particles with an average diameter of 22 nm. Surface N was detected by CO testing. The average diameter of the nickel particles in the reduced Ni-1-Ti sample is about 20 nm. In this case, however, no metal nickel was detected on the surface, i.e. the metal particles are encapsulated in the support. The majority of the active sites for adsorption are regenerated during the reduction of nickel in Ni-1-Ti, which allows Ni2+ ions to be adsorbed again on the sample. As a result, the nickel concentration increases. The mean diameter of the nickel particles on reduced Ni-2-Ti remains of the order of 20 nm, similar to the case of the reduced Ni-1-Ti sample. With Ni-2-Ti, however, surface metal nickel was detected by CO adsorption. It is concluded that successive absorption–reduction of Ni2+ ions might be used to prepare titania supported nickel catalyst with a desired nickel concentration and metal particles that are not encapsulated in the support. Some new aspects of the strong metal–support interaction (SMSI) mechanism are also discussed.","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":"85954668","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

Modelling the diamagnetic susceptibility of organic compounds by a sub-structural graph-theoretical approach 用子结构图理论方法模拟有机化合物的抗磁性

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A709032C

Ernesto Estrada

引用次数: 72

NMR study of electron transfer between paramagnetic complexes Kinetics of the self-exchange reaction [Fe3O(O2CCMe3)6(py)3]+/0 (py = pyridine) 顺磁配合物间电子转移的核磁共振研究自交换反应[fe30o (O2CCMe3)6(py)3]+/0 (py =吡啶)动力学

Journal of the Chemical Society, Faraday Transactions Pub Date : 1998-01-01 DOI: 10.1039/A801051J

F. E. Sowrey, C. Macdonald, R. D. Cannon

引用次数: 14