title: Stoichiometry-controlled supramolecular chirality induction and inversion in bisporphyrin systems.
abstract: [reaction: see text] Stoichiometry is found to be an effective tool for controlling supramolecular chirality induction and inversion processes. Chirality induction in the achiral syn ethane-bridged bis(zinc octaethylporphyrin) is achieved upon interaction with the enantiopure (R,R)-1,2-diphenylethylenediamine at the low molar excess region, to yield the right-handed chiral 1:1 tweezer complex. Further increase of the ligand concentration results in chirality inversion as the equilibrium shifts toward the extended left-handed 1:2 anti complex as a result of switching of the complex helicity.
authors.affiliation: Inoue Photochirogenesis Project, ERATO, JST, 4-6-3 Kamishinden, Toyonaka-shi, Osaka 560-0085, Japan. victrb@chiromor.jst.go.jp
authors.forename: Victor V
authors.initials: VV
authors.lastname: Borovkov
authors.forename: Juha M
authors.initials: JM
authors.lastname: Lintuluoto
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Inoue