Synthesis and Physicochemical Properties of Strong Electron Acceptor 14,14,15,15-Tetracyano-6,13-pentacenequinodimethane (TCPQ) Diimide

14,14,15,15-Tetracyano-6,13-pentacenequinodimethane (TCPQ) diimide, a new tetracyanoquinodimethane analogue with extended conjugation and imide substituents, was synthesized by double DielsAlder reactions and a Knoevenagel condensation reaction. Experimental results showed that TCPQ diimide has a low LUMO energy level (4.03 eV) and good solubility in organic solvents.