Statistical mechanics of helical wormlike chains. X. Dipole moments, electric birefringence, and electric dichroism

1979 ◽  
Vol 71 (9) ◽  
pp. 3573-3585 ◽  
Author(s):  
Hiromi Yamakawa ◽  
Jiro Shimada ◽  
Kyosuke Nagasaka
Keyword(s):  
Statistical Mechanics ◽  
Dipole Moments ◽  
Electric Birefringence ◽  
Electric Dichroism

Dipole moments, Kerr constants and other properties of acetoacetic ester and acetylacetone

1977 ◽  
Vol 30 (3) ◽  
pp. 503
Author(s):  
MA Cusiter ◽  
Fevre RJW Le ◽  
D Millar ◽  
RK Pierens
Keyword(s):  
Carbon Tetrachloride ◽  
Dipole Moments ◽  
Acetoacetic Ester ◽  
Electric Birefringence ◽  
Kerr Constants ◽  
Pulsed Voltage

The proportions of the keto and en01 isomers of ethyl acetoacetateand of acetylacetone incyclohexane, carbon tetrachloride and benzene have been determined by n.m.r. spectroscopy, and expressed as functions of the solute concentrations. Routine methods sufficed for all other observations, except those of electric birefringence, which needed to be examined by a pulsed-voltage technique. The dipole moments and molar Kerr constants so obtained are analysed to provide corresponding data for the separate tautomers. Possible conformations of these keto and en01 molecules can be inferred from considerations involving known bond polarities and anisotropic polarizabilities.

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