Structure and Physical Properties of Alternately Stacked Donor-acceptor Complexes with 5,11-Dimethyl-5,11-dihydroindolo[3,2-b]carbazole

Abstract

Alternately stacked donor-acceptor (DA) complexes containing 5,11-dimethyl-5,11-dihydroindolo[3,2-b]carbazole (ICZ-Me) as a donor were synthesized for the first time by crystallization with three different acceptor molecules. Among them, the DA complex with tetracyanoethylene (TCNE) exhibited the largest effective charge transfer integral (|tDA|), degree of charge transfer (ρ), and electrical conductivity (σ). Designing the noncovalent interaction is important to fix the position of acceptors with respect to ICZ-Me and to control the electronic properties. Alternately stacked donor-acceptor (DA) complexes containing 5,11-dimethyl-5,11-dihydroindolo[3,2-b]carbazole (ICZ-Me) as a donor component were synthesized with three different acceptor molecules. The DA complex with tetracyanoethylene (TCNE) exhibited the largest effective charge transfer integral, degree of charge transfer and electrical conductivity, indicating the importance of designing appropriate noncovalent interaction among molecules for optimizing their electronic properties.