Solid-State Charge Transfer Promoted by an Anchoring Agent: A Two-Component Analogue of Kofler's Ternary Complex

Charge-transfer complex formation between the push−pull zwitterionic molecule 7,7-bis(piperazino)-8,8-dicyanoquinodimethane and picric acid is observed in the solid state. The critical role of proton transfer and intermolecular H bonding in facilitating the charge-transfer interaction is established through control experiments and single-crystal X-ray investigation of the complex. The details of the π−π interaction are analyzed using computed atomic charges.