Quinodimethane embedded expanded helicenes and their open-shell diradical dications/dianions
Qing Jiang, Yi Han, Ya Zou, Chunyan Chi
Abstract
Two new quinodimethane embedded expanded [11]- and [13]helicenes were synthesized, showing a closed-shell quinoidal structure. Their dications and dianions exhibit significant open-shell diradical character with small singlet–triplet energy gaps.
Topics & Concepts
DiradicalMaterials scienceShell (structure)Open shellChemistryOrganic chemistryComposite materialPhysicsAtomic physicsExcited stateSinglet stateSynthesis and Properties of Aromatic CompoundsDNA and Nucleic Acid ChemistrySynthesis of heterocyclic compounds