Jeanne-Marie Lebas

Etude comparée des spectres de vibration des dérivés substitués du thiophéne en position 2, entre 200 et 1700 cm−1 et dans la région de 3000 cm−1

Abstract The spectra of twenty 2-substituted thiophenes, SC 4 H 3 X, were analysed over the range 200–1700 cm −1 and around 3000 cm −1 . An assignment of the fundamental vibrations of thiophenic ring in these compounds is proposed; three series of frequencies are interpreted as resulting of important coupling between νC—X vibration and two thiophenic skeletal vibrations, Some assignments for substituents are discussed.

Attribution comparee des spectres de vibrations de quelques derives de l'anthracene substitues en 9 et en 9,10—I: Region 100–650 cm−1

Abstract The infrared and Raman spectra of 9-monosubstituted and 9–10 disubstituted anthracenes (C 14 H 8 Y 2 ) in the solid state and in solution have been investigated. An assignment of the observed bands is given and the fundamentals are compared with those of the 1,2 disubstituted benzenes.

Spectres de vibrations de pyrimidines tétrasubstituées trichloro-2,4,6 (methylthio)-5 pyrimidine, tétrachloro et tétrabromopyrimidines

Abstract The i.r. and Raman spectra (3500-100 cm −1 ) of trichloro-2,4,6(methylthio)-5 pyrimidine and of tetrachloro and tetrabromopyrimidine have been measured. The coupling of the vibrations ν C-X (X = substituent) with the nuclear vibrations have been studied and the characteristics of these couplings have been determined. The results supplement early work on pyrimidines with fewer substituents and the arrangements of the nuclear vibrations have been reconsidered.

Spectres de vibrations de pyrimidines tétrasubstituées: Amino et méthylamino-2 et -4 dichloro(méthylthio)-5 pyrimidines

Abstract 2- and 4-amino, -methylamino, -dimethylamino dichloro 5-methylthio pyrimidines and their deuterated derivatives are studied by i.r and Raman spectroscopies (3600-100 cm −1 ). X-sensitive ring vibrations, ring out-of-plane vibrations and amino group vibrations are discussed. Spectroscopic data about these latter vibrations allow estimation of the self-association of the studied compounds in solution and in the solid state.