title: Selective detection of minor prototropic tautomers in low-symmetry tetraazaporphyrin derivatives by the combined use of electronic absorption, MCD, and CI calculations.
abstract: A series of low-symmetry metal-free tetraazaporphyrin (TAP) derivatives, i.e. monobenzo-substituted (1H2), adjacently dibenzo-substituted (2AdH2), oppositely dibenzo-substituted (2OpH2), and tribenzo-substituted (3H2) TAP derivatives, has been investigated by the combined use of electronic absorption, MCD, and CI calculations, proving the existence of two prototropic tautomers in 1H2 and 3H2.
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Ishii
authors.forename: Hatsumi
authors.initials: H
authors.lastname: Itoya
authors.forename: Hideya
authors.initials: H
authors.lastname: Miwa
authors.forename: Nagao
authors.initials: N
authors.lastname: Kobayashi