DIELECTRIC CONSTANT AND DIPOLE MOMENT: COUMARINS

 The dielectric constant and density of coumarin have been measured in the molten state at various temperatnres. The dielectric corstants and densities of coumarin 4-methyl-6-ethyl-8-acetyl. and 4-methyl-8-acetyl-umbelliferones have been measured in solution at various concentrations and tempera­tures. The moments have been calculated by applying the new equation and the values obtained compared with the values calculated theoretically.