Color tuning donor–acceptor-type azobenzene dyes by controlling the molecular geometry of the donor moiety

摘要: Abstract Two series of donor–acceptor (D–A)-type azobenzene dyes with a tertiary amine as the donor were synthesized, and their photophysical thermal properties investigated. Although amines same Hammett constant used, molecules varied considerably depending on molecular geometry amine. We found that electron-donating could be controlled by donor, strongly affected orientation n orbital relative to p orbitals π-conjugated system phenyl ring. When was fixed parallel orbitals, exhibited strong properties. These results suggest should considered in addition primary structure for design highly functional materials.