Characterization of poly(isothianaphthene) derivatives and analogs by using solid-state 13C NMR

The combination of several options of a multipurpose 13C CP/MAS solid-state pulse sequence allows the characterization of insoluble poly(isothianaphthene) (PITN) derivatives and analogs. In order to improve solubility and processability of low bandgap polymers, poly (5-tert.butylisothianaphthene) and poly(5,6-dihexoxyisothianaphthene) have been synthesized and analyzed. The same chemistry also allows for the synthesis of poly(2,3-dihydro-1H-indene) and poly (isoindole). Based on model compounds, a proper 13C NMR assignment enables one to predict the geometric structure (aromatic versus quinoid) of these conducting polymers.