title: Synthesis, Absorption, and Electrochemical Properties of Quinoid-Type Bisboron Complexes with Highly Symmetrical Structures.
abstract: Novel bisboron complexes of bidentate ligands consisting of 1,4-benzoquinone and two pyrrole rings were synthesized by using a simple two-step reaction. In solution, the bisboron complexes showed absorption maxima at ∼620 and 800 nm, which were attributed to the allowed S0 → S2 and forbidden S0 → S1 transitions, respectively. The bisboron complexes did not show any fluorescence, probably because of their highly symmetrical structure which forbids the S0 → S1 transition. Bisboron complexes underwent a two-electron reduction to yield the corresponding aromatic dianion, which showed absorption maxima at ∼410 nm.
authors.affiliation: †Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Kubota
authors.affiliation: †Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Niwa
authors.affiliation: ‡Department of Chemistry, Faculty of Science, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan.
authors.forename: Jiye
authors.initials: J
authors.lastname: Jin
authors.affiliation: †Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan.
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Funabiki
authors.affiliation: †Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Matsui
mesh_terms: D000838:Anions / Q000737:chemistry*; D016227:Benzoquinones / Q000138:chemical synthesis* / Q000737:chemistry; D001896:Boron Compounds / Q000737:chemistry; D004563:Electrochemistry; D004583:Electrons; D008024:Ligands; D015394:Molecular Structure
chemical_list: D000838:Anions; D016227:Benzoquinones; D001896:Boron Compounds; D008024:Ligands; C004532:quinone