title: Spiroconjugation in spirodicorrolato-dinickel(II).
abstract: In the present work the effect of spiroconjugation on the electronic spectrum of the recently synthesized metal complex hexadecaethylspirodicorrolato-dinickel(II) (5) (the corrole units in 5 are isoforms) is investigated. To have a suitable reference compound at our disposal, tetraethylhexamethylisocorrolato nickel(II) (7) has been prepared. On comparing the electronic spectra of this reference compound and the spiro-complex, bathochromic shifts of all absorption bands in the NIR/Vis-region are observed for the latter as well as marked changes in the spectral intensities. A detailed analysis of the spectra supported by semiempirical calculations reveals that at least part of the observed changes can be unambiguously attributed to the spiro effect. This effect is further affirmed by electrochemically measured redox potentials.
authors.affiliation: Institut für Physikalische Chemie der Universität zu Köln, Luxemburger Strasse 116, 50939 Köln, Germany. gehohln@pc.uni-koeln.de
authors.forename: Georg
authors.initials: G
authors.lastname: Hohlneicher
authors.forename: Dominik
authors.initials: D
authors.lastname: Bremm
authors.forename: Jennifer
authors.initials: J
authors.lastname: Wytko
authors.forename: Jordi
authors.initials: J
authors.lastname: Bley-Escrich
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Gisselbrecht
authors.forename: Maurice
authors.initials: M
authors.lastname: Gross
authors.forename: Martin
authors.initials: M
authors.lastname: Michels
authors.forename: Johann
authors.initials: J
authors.lastname: Lex
authors.forename: Emanuel
authors.initials: E
authors.lastname: Vogel