title: Elucidation of π-conjugation modes in diarene-fused 1,2-dihydro-1,2-diborin dianions.
abstract: A series of diarene-fused 1,2-dihydro-1,2-diborins were prepared as a new B-B-bond-embedded polycyclic π-electron system. The reduction of these compounds with metals produced their corresponding dianions, the π-conjugation modes of which varied from 6π-conjugation within the central 1,2-diborin skeleton to 14π peripheral conjugation over the tricyclic skeleton, depending on the nature of the reduced biaryl framework. Moreover, the countercation to the dianions had a significant effect on the absorption spectra, with a dramatic color change from yellow to deep blue, depending on the distance between the tricyclic dianion skeleton and the countercation.
authors.affiliation: Department of Chemistry, Graduate School of Science, Nagoya University and CREST, Japan Science and Technology Agency, Furo, Chikusa, Nagoya, 464-8602, Japan.
authors.forename: Takafumi
authors.initials: T
authors.lastname: Araki
authors.forename: Atsushi
authors.initials: A
authors.lastname: Wakamiya
authors.forename: Kenji
authors.initials: K
authors.lastname: Mori
authors.forename: Shigehiro
authors.initials: S
authors.lastname: Yamaguchi