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.

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°).

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.

Dipole moments, Kerr constants and solution-state conformations of 1- and 2-pivaloylnaphthalene

1982 ◽  
Vol 35 (11) ◽  
pp. 2341 ◽  
Author(s):  
D Mirarchi ◽  
GLD Ritchie
Keyword(s):  
Carbon Tetrachloride ◽  
Infinite Dilution ◽  
Dipole Moments ◽  
Dihedral Angles ◽  
Solution State ◽  
Kerr Constants

Infinite-dilution dipole moments (1030p/Cm) and molar Kerr constants (1027mK/m5 V-2 mol-1) for 1-pivaloylnaphthalene (8.83,-490) and 2-pivaloylnaphthalene (9.24, 218) as solutes in carbon tetrachloride at 25�C are reported and analysed to yield the dihedral angles between the Car-CO-C and naphthyl planes as 90 � 10� and 53 � 8�, respectively.

The molar kerr constants, dipole moments, and relaxation times of Methyl and Ethyl Maleates and fumarates, Ethyl Formate, Diethyl Oxalate, and of Ethyl and Propyl Azodiformates

1957 ◽  
Vol 10 (3) ◽  
pp. 218 ◽  
Author(s):  
CG Le Fevre ◽  
RJW Le Fevre ◽  
WT Oh
Keyword(s):  
Carbon Tetrachloride ◽  
Infinite Dilution ◽  
Dipole Moments ◽  
Azimuthal Angle ◽  
Relaxation Times ◽  
Ethyl Formate ◽  
The Other ◽  
Diethyl Oxalate ◽  
Negative Results ◽  
Kerr Constants

Values for the properties and compounds named in the title are recorded at infinite dilution in carbon tetrachloride at 25 �C. Dipole moments of the seven diesters lie between 2 2 and 2.8 D ; the molar Kerr constants of the two azodiformates however differ from those of the maleates, fumarates, and oxalate in being negative. Results with ethyl oxalate are consistent with a structure in which the two ?CO2Et groups are in planes making an azimuthal angle c. 90�. Indications of configurations for the other esters are discussed, but conclusions are indefinite.

Dipole moments, Kerr constants and solution-state conformations of di(pyridin-4-yl), di(pyridin-3-yl) and di(pyridin-2-yl) ketone

1980 ◽  
Vol 33 (12) ◽  
pp. 2597 ◽  
Author(s):  
PH Gore ◽  
IG John ◽  
RK Pierens ◽  
GLD Ritchie
Keyword(s):  
Carbon Tetrachloride ◽  
Dipole Moments ◽  
Strong Preference ◽  
Trans Conformation ◽  
Solution State ◽  
Kerr Constants

Experimental dipole moments and molar Kerr constants are reported and analysed for di(pyridin-4-yl), di(pyridin-3-yl) and di(pyridin-2-yl) ketone as solutes in carbon tetrachloride or cyclohexane at 298 K. The preferred conformation of di(pyridin-4-yl) ketone is found to be very similar to those previously deduced for benzophenone and several 4,4'- disubstituted benzophenones. For di(pyridin-3-yl) and di(pyridin-2-yl) ketone three analogous conrotatory structures having different relative dispositions of the nitrogen atoms are considered. In the case of di(pyridin-3-yl) ketone the cis-trans and trans-trans arrangements are approximately equally abundant, but for di(pyridin-2-yl) ketone there is a strong preference for the trans-trans conformation.

Infrared Study of Benzaldehyde and 4-Substituted Benzaldehydes in Carbon Tetrachloride and/or Chloroform Solutions: The Carbonyl Group

1991 ◽  
Vol 45 (10) ◽  
pp. 1641-1648 ◽  
Author(s):  
Richard A. Nyquist ◽  
Sam E. Settineri ◽  
Davin A. Luoma
Keyword(s):  
Carbon Tetrachloride ◽  
Carbonyl Group ◽  
Functional Groups ◽  
Functional Group ◽  
Solvent System ◽  
Infrared Study ◽  
Solvent Systems ◽  
Substituted Benzaldehydes ◽  
Uniform Manner ◽  
Acceptor Numbers

The carbonyl stretching mode of 4- x-benzaldehydes increases in frequency as the mole % CHCl3/CCl4 decreases and as the value of σP− or σRO for the 4- x atom or group increases. Other functional groups such as OH, NO2 and CN are also affected by interaction with the CHCl3 and/or CCl4 solvent system. Other solvents may interact differently with each functional group so that, say, vC=O vs. σP−, σRO, or solvent acceptor numbers (AN) may not correlate in a uniform manner in all solute/solvent systems.

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
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