title: Coordination-induced spin-state-switch (CISSS) in water.
abstract: We present a non-ionic water-soluble porphyrin that does not exhibit measurable aggregation even at high concentrations in water. The spin state of the corresponding nickel(II) complex changes from completely diamagnetic (low-spin) to paramagnetic (high-spin) upon addition of a strong axial ligand. This leads to a strongly reduced NMR relaxation time of the water protons even at low concentrations of the complex.
authors.affiliation: Otto-Diels-Institute of Organic Chemistry, Christian-Albrechts-Universität zu Kiel, Otto-Hahn-Platz 4, 24118 Kiel, Germany. rherges@oc.uni-kiel.de.
authors.forename: Marcel
authors.initials: M
authors.lastname: Dommaschk
authors.forename: Florian
authors.initials: F
authors.lastname: Gutzeit
authors.forename: Susann
authors.initials: S
authors.lastname: Boretius
authors.forename: Rainer
authors.initials: R
authors.lastname: Haag
authors.forename: Rainer
authors.initials: R
authors.lastname: Herges
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D009532:Nickel / Q000737:chemistry*; D011166:Porphyrins / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D056831:Coordination Complexes; D011166:Porphyrins; D014867:Water; D009532:Nickel