Advances in Molecular Relaxation and Interaction Processes最新文献_第9页

Infrared study of the interaction between carbonyl bases and HCl or HBr 羰基碱与HCl或HBr相互作用的红外研究

Advances in Molecular Relaxation and Interaction Processes Pub Date : 1981-12-01 DOI: 10.1016/0378-4487(81)80063-5

F. Geleyn, R. Thijs, Th. Zeegers-Huyskens

引用次数: 3

Etero - association in ionic dye solutions 离子染料溶液中的氯缔合

Advances in Molecular Relaxation and Interaction Processes Pub Date : 1981-12-01 DOI: 10.1016/0378-4487(81)80059-3

V. Vitagliano, O. Ortona, L. Costantino, S. Del Gaudio, C. Della Volpe, G. Guarino, R. Sartorio

引用次数: 0

Microwave dielectric relaxation of methyl and ethylcellosolve 甲基和乙基纤维素溶液的微波介电弛豫

Advances in Molecular Relaxation and Interaction Processes Pub Date : 1981-12-01 DOI: 10.1016/0378-4487(81)80060-X

H. Farber, S. Petrucci

{"title":"Microwave dielectric relaxation of methyl and ethylcellosolve","authors":"H. Farber, S. Petrucci","doi":"10.1016/0378-4487(81)80060-X","DOIUrl":"10.1016/0378-4487(81)80060-X","url":null,"abstract":"<div>The complex dielectric permittivity of methyl and ethylcellosolve at 25°C and in the frequency range 1–90 GHz are reported. The real and imaginary coefficients of the permittivity show a relaxation profile with frequency that can be interpreted either by a Cole-Davidson distribution function or by the sum of two discrete Debye-relaxation processes. Preference for the latter description is given not on the basis of an optimum of a numerical fit, but rather on the proposal that the two Debye processes are related to H-bond breaking, as for the alcohols, and to alkoxy and/or molecular tumbling respectively. Evidence of the above hypothesis is given by reporting the complex permittivity of methylcellosolve-dimethoxyethane mixtures in the whole composition range. It is shown that the relaxation contribution ε0-ε∞1, attributed to the lower Debye relaxation process (and assigned to the H-bond breaking process) is proportional to the molarity of methylcellosolve up to the pure liquid. This shows that by substituting the OH group by the methoxy group, the effect attributed to (ε0-ε∞1) decreases and disappears when no -OH groups are present as for pure dimethoxyethane. Further, by taking the position that the contribution ε0-ε∞1 is to be dealt with as in liquid mixtures, the apparent dipole moment μ∼3 Debyes is calculated by the Böttcher theory. This figure is comparable to the values of μ calculated by the Onsager theory for the alcohols. The above seems to suggest that although the Cole-Davidson distribution function may fit the relaxation profile numerically, it eludes (by its own nature) the molecular description of the dielectric relaxation processes.</div>","PeriodicalId":100049,"journal":{"name":"Advances in Molecular Relaxation and Interaction Processes","volume":"21 3","pages":"Pages 197-206"},"PeriodicalIF":0.0,"publicationDate":"1981-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4487(81)80060-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74469874","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: 0

Raman bandwidths and molecular motion in liquid HSiCℓ3 and DSiCℓ3 液体HSiC和DSiC中的拉曼带宽和分子运动

Advances in Molecular Relaxation and Interaction Processes Pub Date : 1981-12-01 DOI: 10.1016/0378-4487(81)80058-1

I. Rossi, C. Brodbeck, Nguyen-van-Thanh, H. Strapelias , A. Ruoff, H. Burger, R. Eujen

引用次数: 0

Dynamical and structural aspects of molecular reorientation in plastic crystals of the (CH3)3CX type (CH3)3CX型塑料晶体中分子重定向的动力学和结构研究

Advances in Molecular Relaxation and Interaction Processes Pub Date : 1981-12-01 DOI: 10.1016/0378-4487(81)80062-3

S. Urban

引用次数: 25

On two-component NMR relaxation 关于双组分核磁共振弛豫

Advances in Molecular Relaxation and Interaction Processes Pub Date : 1981-12-01 DOI: 10.1016/0378-4487(81)80057-X

H. Winkler , A. Gutsze

引用次数: 15

Contents of volume 21 第21卷内容

Advances in Molecular Relaxation and Interaction Processes Pub Date : 1981-12-01 DOI: 10.1016/0378-4487(81)80065-9

引用次数: 0

Publications received 出版物收到

Advances in Molecular Relaxation and Interaction Processes Pub Date : 1981-12-01 DOI: 10.1016/0378-4487(81)80064-7

引用次数: 0

Deuterium isotope effect in the IR spectra of some pyridine trifluoroacetates in benzene 苯中某些三氟乙酸吡啶酯红外光谱中的氘同位素效应

Advances in Molecular Relaxation and Interaction Processes Pub Date : 1981-12-01 DOI: 10.1016/0378-4487(81)80061-1

Z. Dega-Szafran, E. Dulewicz

引用次数: 4

Dielectric dispersion and relaxation mechanism in some substituted anilines at microwave frequencies 某些取代苯胺在微波频率下的介电色散和弛豫机理

Advances in Molecular Relaxation and Interaction Processes Pub Date : 1981-10-01 DOI: 10.1016/0378-4487(81)80023-4

S.M. Khameshara , M.L. Sisodia

{"title":"Dielectric dispersion and relaxation mechanism in some substituted anilines at microwave frequencies","authors":"S.M. Khameshara , M.L. Sisodia","doi":"10.1016/0378-4487(81)80023-4","DOIUrl":"10.1016/0378-4487(81)80023-4","url":null,"abstract":"<div>The permittivity and dielectric loss of 2-chloro-6-methyl aniline, 3-chloro-2-methyl aniline, 3-chloro-4-methyl aniline, 4-chloro-2-methyl aniline and 5-chloro-2-methyl aniline have been measured at four microwave frequencies viz., 33.45, 18.98, 9.945 and 1.80 GHz and also at 300 KHz and optical frequency at 35°C in benzene solution. Ther permittivity and dielectric loss at different frequencies have been plotted against concentration (wt. fraction). The slopes of these straight lines have been used for the complex plane plots (a″ Vs. a′). The complex plane plots for these compounds are Cole-Cole arc's. The most probable relaxation time (τo) and distribution parameter (α) have been evaluated from these plots. The values of these parameters are found to be in agreement with those obtained from Higasi's single frequency method. Data have also been analysed in terms of two relaxation processes i.e., corresponding to overall rotation and group rotation. Nearly equal values of τ2, the relaxation time for intramolecular rotation, for these substituted anilines suggest that the amino-group relaxes by an inversion mechanism. The dipole moments, evaluated by the microwave method, are also reported.</div>","PeriodicalId":100049,"journal":{"name":"Advances in Molecular Relaxation and Interaction Processes","volume":"21 2","pages":"Pages 105-115"},"PeriodicalIF":0.0,"publicationDate":"1981-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4487(81)80023-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91072554","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: 0