Polymorph Screening of Core-Chlorinated Naphthalene Diimides with Different Fluoroalkyl Side-Chain Lengths

In this work, naphthalenediimide (NDI) derivatives are widely studied for their semiconducting properties and the influence of the side-chain length on the crystal packing is reported, along with the thermal properties of three core-chlorinated NDIs with different fluoroalkyl side-chain lengths (CF -NDI, C F -NDI and C F -NDI). The introduction of fluorinated substituents at the imide nitrogen and addition of strong electron-withdrawing groups at the NDI core are used to improve the NDI derivatives air stability. The new compound, CF -NDI, was deeply analyzed and compared to the well-known C F -NDI and C F -NDI, leading to the discovery and solution of two different crystal phases, form α and solvate form, and a solid solution of CF -NDI and CF -NDI-OH, formed by the decomposition in DMSO.