title: Coordination-induced spin-state switching with nickel chlorin and nickel isobacteriochlorin.
abstract: We present the first coordination-induced spin-state switching with nickel chlorin and nickel isobacteriochlorin. The spin-state switching was monitored by UV-vis spectroscopy and NMR titration experiments. The association constants (K1 and K2) and thermodynamic parameters (ΔH and ΔS) of the coordination of pyridine were determined. The first X-ray analyses of a paramagnetic nickel chlorin and a nickel isobacteriochlorin provide further information about the structure of the octahedral complexes. Nickel chlorin and even more pronounced nickel isobacteriochlorin exhibit stronger coordination of axial ligands compared to the corresponding nickel porphyrin and thus provide the basis for more efficient spin-switching systems.
authors.affiliation: Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität , Otto-Hahn-Platz 4, D-24098 Kiel, Germany.
authors.forename: Marcel
authors.initials: M
authors.lastname: Dommaschk
authors.affiliation: Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität , Otto-Hahn-Platz 4, D-24098 Kiel, Germany.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Thoms
authors.affiliation: Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität , Otto-Hahn-Platz 4, D-24098 Kiel, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Schütt
authors.affiliation: Institut für Anorganische Chemie, Christian-Albrechts-Universität , Otto-Hahn-Platz 6/7, 24098 Kiel, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Näther
authors.affiliation: Department of Chemistry, Nanoscience Center, University of Jyvaskyla , P.O. Box 35, 40014 Jyvaskyla, Finland.
authors.forename: Rakesh
authors.initials: R
authors.lastname: Puttreddy
authors.affiliation: Department of Chemistry, Nanoscience Center, University of Jyvaskyla , P.O. Box 35, 40014 Jyvaskyla, Finland.
authors.forename: Kari
authors.initials: K
authors.lastname: Rissanen
authors.affiliation: Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität , Otto-Hahn-Platz 4, D-24098 Kiel, Germany.
authors.forename: Rainer
authors.initials: R
authors.lastname: Herges