Crystal structures and dielectric properties of 4,4 '-dimethyl-6,6 '-dichlorothioinaigo (Pigment Red 181)

The structures of the red polymorph (space group P (1) over bar) and the black polymorph (space group P2(1)/c) of 4,4'-dimethyl-6,6'-dichlorothioindigo were solved from single-crystal samples. For both polymorphs, the spatial stacking of the flat molecules is driven by pi-stacking and noncovalent interactions within the layers. Spectroscopic (UV-vis, IR and photoluminescence) and thermal properties of the red polymorph were investigated experimentally. The bandgap of this polymorph was estimated as 2.08 eV at room temperature. It is demonstrated that the electric conductivity of the red polymorph follows the hopping mechanism.