Aromaticity and π-bond covalency: prominent intermolecular covalent bonding interaction of a Kekulé hydrocarbon with very significant singlet biradical character†‡§ Akihiro Shimizu,a Yasukazu Hirao,a Kouzou Matsumoto,a Hiroyuki Kurata,a Takashi Kubo,*a Mikio Uruichib and Kyuya Yakushib Author affiliations * Corresponding authors a Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Japan E-mail: kubo@chem.sci.osaka-u.ac.jp b Institute for Molecular Science, Okazaki, Japan Abstract An anthracene-linked bisphenalenyl Kekulé molecule with very significant singlet biradical character has shown a prominent covalent bonding interaction between molecules in a molecular aggregate. High aromatic stabilization energy in the anthracene linker is responsible for the significant singlet biradical character. This article is part of the themed collection: Aromaticity You have access to this article Please wait while we load your content... Something went wrong. Try again?