Nitroglycerine dipole moment

On the basis of the dipole moment values and viscosity measurements of the two forms of nitroglycerine, de Kreuk [20] considered that the difference between the two forms is produced by rotational isomerism. According to this hypothesis the labile and stable forms would correspond to cis- and trans-isomers respectively. In a non-polar solvent the traits form predominates. In a polar solvent the content of the cis form increases and reaches a maximum in liquid nitroglycerine. 

Dielectric constant e20 = 19.25 and dipole moments fi of nitroglycerine were determined by de Kreuk [20] ... 

Recent measurements of dipole moments carried out by Lemanceau and Caire-Maurisier [4] brouglii some new and important conclusions to the problem of the conformation of nitroglycerine and other nitrate esters with three or four atoms of carbon in the chain. They concluded that there is less need for admitting various conformations produced by the rotation around C—C bonds of the chain CH2-CH-CH2. Instead they rationalized their results in terms of the rotation in groups C 0N02 around the bonds C—0, viz. Formulae la and lb ... 

The dielectric constant of nitroglycerine 20 is 19.25. Its dipole moment /t is shown in Table 5.41. 

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