Dielectric Studies. XXVI. Relaxation Data and Apparent Dipole Moments of N‐Methylaniline, N,N‐Dimethylaniline, and N,N‐Diethylaniline

1970 ◽  
Vol 52 (5) ◽  
pp. 2545-2547 ◽  
Author(s):  
S. W. Tucker ◽  
S. Walker
Keyword(s):  
Dipole Moments ◽  
Dielectric Studies ◽  
Relaxation Data

Dielectric studies. Part XXIII. Relaxation data and apparent dipole moments of aniline and some disubstituted aromatic amines

1969 ◽  
Vol 47 (4) ◽  
pp. 681-686 ◽  
Author(s):  
S. W. Tucker ◽  
S. Walker
Keyword(s):  
Aromatic Amines ◽  
Dipole Moments ◽  
Frequency Dispersion ◽  
Dielectric Studies ◽  
Relaxation Data ◽  
Time Model ◽  
Electric Dipole Moments ◽  
Microwave Frequencies ◽  
Dielectric Absorption ◽  
Dielectric Results

Dielectric studies have been carried out at microwave frequencies on dilute solutions of aniline, p-chloro-, p-bromo-, and m-chloro-anilines, and o-, m-, and p-toluidines at 25 °C in cyclohexane and p-xylene. The static dielectric constant has also been measured at 2 MHz. In addition o- and m-toluidines have been measured at 50 °C and p-toluidine at 15, 35, and 50 °C.The dielectric results, particularly those at 70.01 GHz, establish that there is more than one relaxation process present and the data have been analyzed on a two relaxation time model, the longer of which τ1, is identified as molecular relaxation. The cause of the lower electric dipole moments found from this method as opposed to the non-dielectric absorption methods is discussed. It follows that there is either an additional higher frequency dispersion or (and) a high atomic polarization for aniline and o-, m-, and p-toluidines. Work at still higher frequencies is required to study this further and to establish more precise values of τ2.

Dielectric Studies of Aggregation Phenomena with Separated α and β Chains of Human Hemoglobin

1971 ◽  
Vol 26 (5) ◽  
pp. 453-457 ◽  
Author(s):  
Peter Schlecht
Keyword(s):  
Concentration Dependence ◽  
Dipole Moments ◽  
Dielectric Dispersion ◽  
Human Hemoglobin ◽  
Dielectric Studies ◽  
Dielectric Measurements ◽  
Aggregation Phenomena

The concentration dependence of the dielectric dispersion between 100 kHz and 15 MHz has been investigated for separated α and β chains of human hemoglobin. It is shown that such dielectric measurements can give very detailed information on aggregation phenomena. Specific dielectric increments and dipole moments of monomeric and aggregated chains could be obtained.

Dielectric Studies. Part XXXV. Relaxation Studies of Benzaldehyde and Fourpara-Substituted Aideliydes

1974 ◽  
Vol 52 (18) ◽  
pp. 3229-3234 ◽  
Author(s):  
P. F. Mountain ◽  
S. Walker
Keyword(s):  
Hydrogen Bonding ◽  
Relaxation Time ◽  
Intermolecular Hydrogen Bonding ◽  
Dielectric Studies ◽  
Molecular Relaxation ◽  
Relaxation Data ◽  
Dielectric Absorption ◽  
The Mean ◽  
Relaxation Studies ◽  
Xylene Solution

The dielectric absorption has been determined for benzaldehyde, p-fluoro-, p-chloro-, p-bromo-, and p-nitro-benzaldehyde in p-xylene solution at mainly five or six frequencies in the 6.70 to 70.1 GHz region. For all three p-halo-substituents the mean relaxation time values indicate that some mechanism faster than molecular relaxation occurs whereas none was apparent in benzaldehyde itself. A detailed study has been made of p-chlorobenzaldehyde in p-xylene solution at five temperatures, and the data have been analyzed into contributions from a molecular relaxation process and a shorter relaxation time τ2. In the p-xylene solutions of benzaldehyde the relaxation data indicate weak intermolecular hydrogen bonding between the solute and the solvent which is probably of the type [Formula: see text]

Identification of stereoisomers based on dielectric studies: dipole moments of chloroalkenes and chlorocumulenes

Tetrahedron ◽  
1994 ◽  
Vol 50 (6) ◽  
pp. 1707-1716 ◽  
Author(s):  
Paul J. Bauer ◽  
Otto Exner ◽  
Renzo Ruzziconi ◽  
Tran Dinh An ◽  
Claudio Tarchini ◽  
...  
Keyword(s):  
Dipole Moments ◽  
Dielectric Studies

Dielectric studies. Part XVIII. Dipole moments and relaxation times of some symmetrically substituted alkylbenzenes

1968 ◽  
Vol 46 (6) ◽  
pp. 847-851 ◽  
Author(s):  
J. Crossley ◽  
S. Walker
Keyword(s):  
Relaxation Time ◽  
Dipole Moments ◽  
Relaxation Times ◽  
Pure Liquid ◽  
Dielectric Studies ◽  
Molecular Reorientation ◽  
Microwave Frequencies ◽  
Short Relaxation Time ◽  
Dielectric Absorption ◽  
Liquid Benzene

The dielectric absorption at four microwave frequencies of pure liquid benzene and p-cymene at 25 °C, p-xylene and mesitylene at 25, 40, 50, and 60 °C, and solutions of durene and hexamethylbenzene in mesitylene at 60 °C has been examined. All show measurable loss factors and apparent dipole moments of about 0.1 to 0.2 D. These moments are less in magnitude than those associated with the short relaxation time (τ2) process for the polar monoalkylbenzenes. o-xylene and m-xylene. Their relaxation times are too short for molecular reorientation and there is a rough correlation between the number of collisions/molecule s and the reciprocal relaxation time.

Dipole moments and tautomeric equilibria of some aroylacetanilides

1981 ◽  
Vol 78 ◽  
pp. 155-159 ◽  
Author(s):  
Magdi M. Naoum ◽  
Hakim G. Shinouda ◽  
Ahmed S. Shawali ◽  
Hanna A. Rizk
Keyword(s):  
Dipole Moments ◽  
Tautomeric Equilibria
Sign in / Sign up

Export Citation Format

Share Document