Coupling Tetracyanoquinodimethane to Tetrathiafulvalene: A Fused TCNQ-TTF-TCNQ Triad

摘要

The first marriage of tetrathiafulvalene (TTF) and tetracyanoquinodimethane (TCNQ) took place in 1973, when an intermolecular 1:1 charge-transfer complex was formed, which led to the discovery of the first organic metal. One year later, Aviram and Ratner theoretically predicted a rectifying behavior for a covalently coupled TTF-σ-TCNQ dyad. Since then numerous studies devoted to synthesizing covalent TTF-linker-TCNQ dyads have been undertaken, motivated by potential applications in molecular electronics and optoelectronics. However, the task of covalently coupling a strong π-electron donor to a strong π-electron acceptor is extremely difficult. Many examples of TTF moieties attached to moderate acceptors have been published.