The Electrical Polarization of 1,4-Dicyanobenzene

Abstract

The anomalous total electric polarization of 1,4-dicyanobenzene has been shown not to be due to high atom polarization by dielectric constant measurement of the solid substance and by its spectral absorption in the far i.r. However the evaluation of atom polarization from the spectral absorption is questioned because these absorptions have a large temperature coefficient in the 50-150 cm-' region. The apparent dipole moment of 1,4-dicyanobenzene in solution has been measured and found to be ternperaturedependent.On a montrC que l'anomalie dans la polarisation Clectrique totale du dicyano-l,4 benzene n'etait pas caus6 par la polarisation des atomes appartenant a des niveaux Cleves. Ce fait fut dtmontre par la mesure de la constante diilectrique de la substance solide et par son spectre d'absorption dans le lointain i.r. Cependant, 1'6valuation de la polarisation des atomes B partir du spectre d'absorption est remise en question a cause de la presence d'un coefficient Cleve d e temperature pour ces absorptions dans la r6gion de 50 150 cm-I. Le moment dipolaire apparent du dicyano-1,4 benzene en solution a CtC mesurt et est relit ala temperature.[Traduit par l e journal]Can. J. Chem., 51, 2234 (1973)

The Electrical Polarizations of Mercuric Chloride and Dimethylmercury

“…Moreover these absorption bands have been found to change inarkedly in intensity over the temperature range of 79-3 13 OK. This intensity variance has been reported in detail for 1,4-dicyanobenzene (9).…”

“…Because the latter phenomena are not in accord with the Debye construct they have been described as apparent dipole moments. Recently 1,4-dicyanobenzene (9) has been included in the same category.…”