title: Synthesis and identification of a trimethylenemethane derivative pi-extended with three pyridinyl radicals.
abstract: A trimethylenemethane (TMM) derivative 1(2*), in which the parent TMM is pi-extended by the symmetric insertion of three pyridine rings into the C-C bonds of TMM, has been synthesized by the alkali metal reduction of the isolated corresponding dication. Although the frozen-glass X-band cw-ESR spectrum of 1(2*) gave unresolved fine structures due to the small ZFS parameters, pulsed ESR two-dimensional electron spin transient nutation (2D-ESTN) spectroscopy unambiguously can afford to identify diradical 1(2*) as a triplet species.
authors.affiliation: Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. kmatsu@chem.sci.osaka-u.ac.jp
authors.forename: Kouzou
authors.initials: K
authors.lastname: Matsumoto
authors.forename: Daisuke
authors.initials: D
authors.lastname: Inokuchi
authors.forename: Yasukazu
authors.initials: Y
authors.lastname: Hirao
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kurata
authors.forename: Kazunobu
authors.initials: K
authors.lastname: Sato
authors.forename: Takeji
authors.initials: T
authors.lastname: Takui
authors.forename: Takashi
authors.initials: T
authors.lastname: Kubo