1,7-, 1,6-, and 1,6,7- Derivatives of dodecylthio perylene diimides: Synthesis, characterization, and comparison of electrochemical and optical properties

•Three derivatives of dodecylthio substituted perylene diimides are characterized.•Changes in the substitution pattern affect the photo-physical and electrochemical properties.•The magnitude of ground to excited-state dipole moment varies between derivatives.•The color of reduced forms highlight their potential use as electrochromic materials.