The molar Kerr constants of certain aromatic azo derivatives

1966 ◽  
Vol 19 (1) ◽  
pp. 29 ◽  
Author(s):  
RS Armstrong ◽  
RJW Le Fevre
Keyword(s):  
Infinite Dilution ◽  
Molecular Conformations ◽  
Form Part ◽  
Azo Derivatives ◽  
Kerr Constants

Molar Kerr constants at infinite dilution in benzene at 25� are reported for eight compounds in which azo or azoxy groups form part of a conjugated system. Interpretation of the new data is attempted in terms of anisotropic bond polarizabilities, molecular conformations, etc. Problems arising from the colours and/or structures of these solutes are discussed.

Kerr constants and conformations of some p-substituted benzaldehydes

1982 ◽  
Vol 35 (3) ◽  
pp. 663
Author(s):  
D Mirarchi ◽  
GLD Ritchie ◽  
AJ Williams
Keyword(s):  
Carbon Tetrachloride ◽  
Infinite Dilution ◽  
Molecular Conformations ◽  
Substituted Benzaldehydes ◽  
Kerr Constants

Analysis of the experimental infinite-dilution molar Kerr constants of five p-substituted benzaldehydes (X-C6H4-CHO; X = NO2, CN, F, Cl, Br) as solutes in carbon tetrachloride at 298 K confirms that uniplanar molecular conformations are preferred.

296. Molecular polarisability. Dependence of apparent molar Kerr constants at infinite dilution on the medium in which they are measured

1958 ◽  
Vol 0 (0) ◽  
pp. 1474-1484 ◽  
Author(s):  
R. S. Armstrong ◽  
M. Aroney ◽  
C. G. Le Fèvre ◽  
R. J. W. Le Fèvre ◽  
M. R. Smith
Keyword(s):  
Infinite Dilution ◽  
Kerr Constants

Molecular polarizability: The molar Kerr constants of diazoaminobenzene and four of its derivatives.

1966 ◽  
Vol 19 (4) ◽  
pp. 709
Author(s):  
RS Armstrong ◽  
RJW Le Fevre ◽  
AN Singh
Keyword(s):  
Infinite Dilution ◽  
Kerr Constant ◽  
Molecular Polarizability ◽  
Constant Concentration ◽  
Nitro Derivatives ◽  
Kerr Constants ◽  
Concentration Curves

The molar Kerr constants of diazoaminobenzene and its 4,4'-dimethyl, 4,4'-clichloro, 4,4'-dibromo, and 4-nitro derivatives at infinite dilution in benzene at 25� are recorded. No abnormalities in the molar Kerr constant-concentration curves due to dimeric association can be found with any of the above solutes.

scholarly journals Two polymorphs of 2,5-dichloro-3,6-bis(dibenzylamino)-p-hydroquinone with flexible dibenzylamino groups

2018 ◽  
Vol 74 (4) ◽  
pp. 437-441
Author(s):  
In-Sub Shin ◽  
Yuta Shimada ◽  
Emi Horiguchi-Babamoto ◽  
Shinya Matsumoto
Keyword(s):  
Crystal Structures ◽  
Intermolecular Interactions ◽  
Structural Difference ◽  
Molecular Structures ◽  
The Other ◽  
Molecular Conformations ◽  
Stacking Pattern ◽  
Structural Differences ◽  
Form Part ◽  
Phenyl Rings

We obtained two conformational polymorphs of 2,5-dichloro-3,6-bis(dibenzylamino)-p-hydroquinone, C34H30Cl2N2O2. Both polymorphs have an inversion centre at the centre of the hydroquinone ring (Z′ = 1 \over 2), and there are no significant differences between their bond lengths and angles. The most significant structural difference in the molecular conformations was found in the rotation of the phenyl rings of the two crystallographically independent benzyl groups. The crystal structures of the polymorphs were distinguishable with respect to the arrangement of the hydroquinone rings and the packing motif of the phenyl rings that form part of the benzyl groups. The phenyl groups of one polymorph are arranged in a face-to-edge motif between adjacent molecules, with intermolecular C—H...π interactions, whereas the phenyl rings in the other polymorph form a lamellar stacking pattern with no significant intermolecular interactions. We suggest that this partial conformational difference in the molecular structures leads to the significant structural differences observed in their molecular arrangements.

Dipole Moments, Kerr Constants and Solute Conformations of the Aryl Methyl Sulfones p-XC6H4S(02)CH3 (X = H, Cl, BR or NO2)

1987 ◽  
Vol 40 (3) ◽  
pp. 619 ◽  
Author(s):  
MJ Aroney ◽  
RJW LeFevre ◽  
RK Pierens ◽  
HJ Stootman ◽  
MGM Yong
Keyword(s):  
Experimental Data ◽  
Carbon Tetrachloride ◽  
Infinite Dilution ◽  
Dipole Moments ◽  
Solution State ◽  
Dimethyl Sulfone ◽  
Kerr Constants ◽  
Aryl Methyl

Measurements are reported of the infinite-dilution dipole moments and molar Kerr constants of dimethyl sulfone and of the four aryl methyl sulfones p-XC6H4S(02)CH3 (X = H, Cl, Br or NO2) dissolved in carbon tetrachloride or dioxan at 298 K and under light of 589 nm. The experimental data are analysed to obtain information on the solution-state conformations in relation to steric and electromeric effects operative between the aryl and methanesulfonyl groups.

Cotton-Mouton and Kerr constants of twelve non-dipolar tri- and hexa-substituted benzenes

1982 ◽  
Vol 35 (5) ◽  
pp. 869 ◽  
Author(s):  
GLD Ritchie ◽  
J Vrbancich
Keyword(s):  
Carbon Tetrachloride ◽  
High Frequency ◽  
Infinite Dilution ◽  
Experimental Results ◽  
Lower Sensitivity ◽  
Polarizability Anisotropy ◽  
Substituted Benzenes ◽  
Significant Temperature ◽  
Predicted Values ◽  
Kerr Constants

Measurements of the infinite-dilution molar Cotton-Mouton and Kerr constants of 12 non-dipolar 1,3,5-tri- and hexa-substituted benzenes as solutes in carbon tetrachloride at 298 K are reported. Some of the experimental results are in notable disagreement with earlier determinations made on equipment of much lower sensitivity. Although the magnetic anisotropies derived for the tri-substituted benzenes are concordant with other observed or predicted values, those for the hexa-substituted benzenes are generally very much larger than expected. It is suggested, in explanation, that relatively large and strongly anisotropic atomic polarizabilities may cause the ratio of the static to the high-frequency polarizability anisotropy to be considerably smaller in the hexa-substituted benzenes than in benzene; in addition, there may be significant temperature independent contributions to the magnetic birefringences of these molecules.

Effects of p-substituents on the conformation of acetophenone

1981 ◽  
Vol 34 (7) ◽  
pp. 1443 ◽  
Author(s):  
D Mirarchi ◽  
GLD Ritchie
Keyword(s):  
Carbon Tetrachloride ◽  
Dihedral Angle ◽  
Infinite Dilution ◽  
Dipole Moments ◽  
Reported Data ◽  
Kerr Constants

Experimental dipole moments and infinite-dilution molar Kerr constants are reported for six p-substituted acetophenones (CH3COC6H4X; X = Me, But, NO2, CN, F, Br) as solutes in carbon tetrachloride at 298 K. Analysis of these results and reconsideration of previously reported data for acetophenone and p-chloroacetophenone yields the dihedral angle, Φ, between the planes of the carbonyl and aryl groups in the effective conformation of each molecule (X = H, Φ = 0°; Me, 0°; But, 10�10°; NO2, 20�15°; NO2, 20�20°; F, 27�5°; Cl, 32�5°; Br, 30�10°).

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