13C and 15N NMR spectra of 1-(3- or 4-substituted phenyl)-3-methyl-3-phenyltriazenes

Abstract

13C and 15N NMR spectra of ten 1-(3- or 4-substituted phenyl)-3-methyl-3-phenyltriazenes have been measured in deuteriochloroform. In the temperature range from 210 to 320 K the 13C NMR signals of both methyl and phenyl groups were not broadened, and no free rotation of the substituents at N(3)has been proved. From the values 2J(15N(2) 13C(5')) and 2J(15N(2)13C(1')) it was possible to determine conformation at the N(2) - N(3) bond which has partial double bond character. The value 1J(15N(1) 13C(1)) is equal to 1.0 Hz, which proves trans arrangement of the substituents at the N(1) = N(2) bond.