{"title":"Dynamics of small molecule-micelle interactions. A stopped-flow investigation of the kinetics of absorption of acridine (and related) dyes into anionic","authors":"Brian H. Robinson, Neal C. White, Cecilia Mateo","doi":"10.1016/0001-8716(75)80033-2","DOIUrl":"10.1016/0001-8716(75)80033-2","url":null,"abstract":"<div><p>The rates of absorption (solubilization) of positively charged acridine (and related) dyes into anionic micelles formed by sodium <em>n</em>-alkyl sulphates</p><p>The mechanism proposed for incorporation of dye into the micelle is a two-step process involving a very rapid (diffusion-controlled) adsorption of dye</p><p>Below the critical micelle concentration (CMC) of the surfactant, a time-dependent association of dye and surfactant is observed, which gives large agg</p></div>","PeriodicalId":100050,"journal":{"name":"Advances in Molecular Relaxation Processes","volume":"7 4","pages":"Pages 321-338"},"PeriodicalIF":0.0,"publicationDate":"1975-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-8716(75)80033-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74424302","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}
{"title":"CNDO/2 Molecular orbital studies on π hydrogen bonding","authors":"A.S.N. Murthy, G.R. Saini, Kamla Devi, S.B. Shah","doi":"10.1016/0001-8716(75)80029-0","DOIUrl":"10.1016/0001-8716(75)80029-0","url":null,"abstract":"<div><p>CNDO/2 molecular orbital calculations have been carried out on the hydrogen bonding of water and HF with the π-electrons of HCN, CH<sub>3</sub>CN, C<sub>2</sub>H<sub>4</sub>, C<sub>2</sub>H<sub>2</sub> and H<sub>2</sub>CO. The dissociation energies of hydrogen bonds with the π-electrons of the triple bond are higher than those with the double bond in H<sub>2</sub>CO. In the case of the interaction of water with HCN and CH<sub>3</sub>CN, the hydrogen bond energies with the lone pairs and π-electrons are about the same. For the interaction of HF with a nitrile and an isonitrile, the dissociation energies are comparable.</p></div>","PeriodicalId":100050,"journal":{"name":"Advances in Molecular Relaxation Processes","volume":"7 3","pages":"Pages 255-262"},"PeriodicalIF":0.0,"publicationDate":"1975-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-8716(75)80029-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73687216","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}
{"title":"Correlation analysis of experimental permittivity data","authors":"K. Giese","doi":"10.1016/0001-8716(75)80022-8","DOIUrl":"10.1016/0001-8716(75)80022-8","url":null,"abstract":"<div><p>The auto-correlation function Φ<em><sub>h,h</sub></em>(<em>r</em>) of the relaxation time distribution function <em>h</em>(<em>r</em>) is obtained from the auto- and cross-correlations of real and imaginary parts of the permittivity by inversion of convolution integrals. If the permittivity data are subject to experimental error, the spectrum of the auto-correlation Φ<em><sub>h,h</sub></em>(<em>r</em>) appears to be most suitable for the determination of the main characteristics of the distribution function <em>h</em>(<em>r</em>). It is necessary to obtain additional information by evaluating the lower order moments of the distribution function.</p></div>","PeriodicalId":100050,"journal":{"name":"Advances in Molecular Relaxation Processes","volume":"7 3","pages":"Pages 157-166"},"PeriodicalIF":0.0,"publicationDate":"1975-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-8716(75)80022-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85085513","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}
{"title":"Structure des associations nitrile—phénol: étude expérimentale et théorique","authors":"M.-I. Baraton, S. Besnaïnou","doi":"10.1016/0001-8716(75)80023-X","DOIUrl":"10.1016/0001-8716(75)80023-X","url":null,"abstract":"<div><p>A theoretical study by STO—3G method of the hydrogen bond association between acetonitrile and phenol is reported. The results are compared to those previously obtained by static dielectric constant measures and CNDO/2 calculations.</p><p>The latter two methods, experimental and theoretical, have made possible a comparative study of propionitrile—, fumarodinitrile— and succinonitrile—phenol complexes.</p><p>The barriers to internal rotation in the isolated succinonitrile molecule are determined. In addition to the <em>trans</em> conformation, there is a stable <em>gauche</em> conformation, the existence of which appears to be more probable with the formation of the hydrogen bond.</p></div>","PeriodicalId":100050,"journal":{"name":"Advances in Molecular Relaxation Processes","volume":"7 3","pages":"Pages 167-175"},"PeriodicalIF":0.0,"publicationDate":"1975-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-8716(75)80023-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73019737","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}
{"title":"Dielectric relaxation of short-chain alkyl bromides","authors":"Martin S. Beevers, Graham Williams","doi":"10.1016/0001-8716(75)80028-9","DOIUrl":"10.1016/0001-8716(75)80028-9","url":null,"abstract":"<div><p>The dielectric relaxation of Br(CH<sub>2</sub>)<sub><em>N</em>−1</sub>Br, with <em>N</em> = 4 and <em>N</em> = 5, of Br(CH<sub>2</sub>)<sub><em>N</em>−1</sub>Br with <em>N</em> = 3 and <em>N</em> = 4 and for 1,2-dichloroethane is deduced using the Jernigan method, where the internal conformational changes are governed by the rotational isomeric state model of Flory. It is found that the dipole moment correlation function for internal conformational changes depends upon the choice of reference coordinate system, and that the dipole moment correlation function cannot be generalized so as to include both overall and internal motions of the chain. An alternative approach, which involves the rotational isomeric state model but conserves angular momentum during an elementary conformational change, is suggested. The available microwave dielectric data on such compounds are considered in relation to the results of the theory.</p></div>","PeriodicalId":100050,"journal":{"name":"Advances in Molecular Relaxation Processes","volume":"7 3","pages":"Pages 237-254"},"PeriodicalIF":0.0,"publicationDate":"1975-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-8716(75)80028-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80728913","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}
{"title":"Dielectric absorption of liquid normal alkanes in the microwave and far infrared regions","authors":"Ulrich Stumper","doi":"10.1016/0001-8716(75)80025-3","DOIUrl":"10.1016/0001-8716(75)80025-3","url":null,"abstract":"<div><p>The dielectric absorption of liquid <em>n</em>-alkanes has been investigated as a function of frequency and temperature by means of interferometric and resonator techniques in the microwave range and Fourier spectrophotometry in the far infrared band. The large amount of permittivity data now available in a wide frequency range (9 to 6000 GHz) permits a satisfactory evaluation of relaxation parameters. The obtained dielectric principal relaxation times (1.6 ps for <em>n</em>-pentane to 8.8 ps for <em>n</em>-dodecane at room temperature) have been compared with other characteristic times taken from the literature for <em>n</em>-alkanes and cognate aliphatic chains. The absorption in the microwave range is possibly caused either by a reorientational relaxation process of weak permanent dipoles attached to the molecule ends or by a translational relaxation process of temporary dipoles induced in the molecule by the local electric field evoked by surrounding neighbours. An estimation shows that, in the latter case, dipole moments are generated which are of amounts comparable with the measured values (about 0.07 D at room temperature), and the lifetimes of which are given by the measured dielectric relaxation time.</p></div>","PeriodicalId":100050,"journal":{"name":"Advances in Molecular Relaxation Processes","volume":"7 3","pages":"Pages 189-208"},"PeriodicalIF":0.0,"publicationDate":"1975-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-8716(75)80025-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91040467","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}
{"title":"Spectroscopie de vibration des dihydrates des acides complexes HSbCl6, HGaCl4, HGaBr4 étude d'ions H5O2+ peu engagés","authors":"G. Picotin, J. Roziere, J. Potier, A. Potier","doi":"10.1016/0001-8716(75)80024-1","DOIUrl":"10.1016/0001-8716(75)80024-1","url":null,"abstract":"<div><p>These dihydrates are halogenometallates of dioxonium. Their infrared and Raman spectra show that the central hydrogen bond is short and centered with a single minimum (isotopic effect). δ and γ OH vibration of that bond are very close, showing a very weak interaction with terminal H<sub>2</sub>O groups. Furthermore, terminal <em>v</em>OH show that H<sub>5</sub>O<sub>2</sub><sup>+</sup> is quite free, with a greater liberty in the hexachloroantimonate.</p></div>","PeriodicalId":100050,"journal":{"name":"Advances in Molecular Relaxation Processes","volume":"7 3","pages":"Pages 177-188"},"PeriodicalIF":0.0,"publicationDate":"1975-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-8716(75)80024-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91471234","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}
{"title":"Un exemple de relaxation nucléaire controlée par un échange chimique: la solvatation du cation Mn2+ dans le diméthylsulfoxyde par RMN du proton","authors":"Jean-Claude Boubel, Jean-Jacques Delpuech","doi":"10.1016/0001-8716(75)80026-5","DOIUrl":"10.1016/0001-8716(75)80026-5","url":null,"abstract":"<div><p>Proton relaxation times of dimethylsulfoxide containing 10<sup>−2</sup>–10<sup>−1</sup> <em>M</em> manganese (II) perchlorate are measured at two frequencies, 8 and 60 MHz, and sixteen temperatures (20–165 °C). These data allow us to compute: the contact shift Δω<sub>M</sub> = 748 ± 13 Hz (25 °C and 60 MHz); the hyperfine coupling constant; the kinetic parameters for the exchange: bound DMSO <figure><img></figure> bulk DMSO: <em>k</em><sub>M</sub> = (6.3 ± 2.3) × 10<sup>6</sup> s<sup>−1</sup>; Δ<em>H</em><sup>≠</sup> = 7.4 ± 0.5 kcal mol<sup>−1</sup>; Δ<em>S</em><sup>≠</sup> = −2.4 ± 0.5 u.e (25 °C), the rotational correlation time: τ<sub>C</sub> = (9.65 ± 0.63) × 10<sup>−11</sup> s and the distance between protons and Mn<sup>2+</sup> cation: <em>r</em> = 4.37 ± 0.05 Å (25 °C); the electronic relaxation time: 1/<em>T</em><sub>1e</sub> = (5.0 ± 1.0) × 10<sup>7</sup> s<sup>−1</sup>. These results describe the geometry and mobility of the first solvation shell and are compared with other examples from the literature.</p></div>","PeriodicalId":100050,"journal":{"name":"Advances in Molecular Relaxation Processes","volume":"7 3","pages":"Pages 209-220"},"PeriodicalIF":0.0,"publicationDate":"1975-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-8716(75)80026-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79294509","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}
{"title":"Influence of dipole inclination to principal axes on molecular relaxation time","authors":"B.J. Cooke, S. Walker","doi":"10.1016/0001-8716(75)80027-7","DOIUrl":"10.1016/0001-8716(75)80027-7","url":null,"abstract":"","PeriodicalId":100050,"journal":{"name":"Advances in Molecular Relaxation Processes","volume":"7 3","pages":"Pages 221-236"},"PeriodicalIF":0.0,"publicationDate":"1975-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-8716(75)80027-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85281900","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}
{"title":"Electron spin relaxation studies of spin—phonon interactions in sodium and potassium metals","authors":"Ron Catterall, Peter P. Edwards","doi":"10.1016/0001-8716(75)80016-2","DOIUrl":"10.1016/0001-8716(75)80016-2","url":null,"abstract":"<div><p>Conduction electron spin resonance (CESR) spectra are reported for colloidal alkali metal particles in frozen solutions of sodium and potassium in hexa</p><p>Electron spin—lattice relaxation rates are governed primarily by spin—orbit coupling during spin—phonon scattering of high velocity electrons, an resistivity.</p><p>A novel method of isolating the spin—orbit contribution to spin relaxation at 1.3 K is described: there is no evidence for freezing in of Umklapp pro</p></div>","PeriodicalId":100050,"journal":{"name":"Advances in Molecular Relaxation Processes","volume":"7 2","pages":"Pages 87-103"},"PeriodicalIF":0.0,"publicationDate":"1975-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-8716(75)80016-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84499957","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}