Infrared spectra of some phenothiazine sulphones

Abstract

The i.r. spectra of a number of substituted phenothiazine sulphones have been determined in the solid state in KBr pellets. Some of them have also been investigated in dilute solutions in CCl₄. The antisymmetric stretching vibrations are always the most strongly affected by passing from solution to crystalline state. The influence of the heterocyclic SO₂ group on vibrations of the 3-substituents in the moiety has also been reported. A useful correlation between the substitution pattern and the C–H out-of-plane deformation bands has been noted.