SYNTHESIS OF NEW SOLUBLE TRIPHENODITHIAZINES - DONOR PROPERTIES, EPR ENDOR INVESTIGATION AND CRYSTALLINE RADICAL-ION SALTS

We report here on the successful synthesis of the two isomeric triphen odithiazines 2 and 7. The synthetic strategy towards these molecules a llows for the incorporation of solubilizing alkyl groups. The EPR spec troscopical investigation of the solutions of radical cations derived from 2,3 and 7 shows a delocalisation of the electron spin over the wh ole molecule. Furthermore, the ENDOR spectra were recorded. We were ab le to solve the crystal structure of a radical ion salt derived from 3 . This shows that segregated stacking is prefered and the conformation of 3.+ is flatened compared to the neutral species.