title: Proton NMR spectroscopy and magnetic properties of a solution-stable dicopper(II) complex bearing a single mu-hydroxo bridge.
abstract: The reaction of copper(II) perchlorate with the macrocyclic ligand [22]py4pz in the presence of base leads to formation of a dinuclear complex [Cu(2)([22]py4pz)(mu-OH)](ClO(4))(3)xH(2)O, in which two copper ions are bridged by a single mu-hydroxo bridge. Each copper ion is further surrounded by four nitrogen atoms of the ligand. The mu-hydroxo bridge mediates a strong antiferromagnetic coupling (2J = -691(35) cm(-1)) between the metal centers, leading to relatively sharp and well-resolved resonances in the (1)H NMR spectrum of the complex in solution. We herein report the crystal structure, the magnetic properties, and the full assignment of the hyperfine-shifted resonances in the NMR spectrum of the complex, as well as the determination of the exchange coupling constant in solution through temperature-dependent NMR studies.
authors.affiliation: Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands.
authors.forename: Iryna A
authors.initials: IA
authors.lastname: Koval
authors.forename: Karlijn
authors.initials: K
authors.lastname: van der Schilden
authors.forename: Anna Maria
authors.initials: AM
authors.lastname: Schuitema
authors.forename: Patrick
authors.initials: P
authors.lastname: Gamez
authors.forename: Catherine
authors.initials: C
authors.lastname: Belle
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Pierre
authors.forename: Matthias
authors.initials: M
authors.lastname: Lüken
authors.forename: Bernt
authors.initials: B
authors.lastname: Krebs
authors.forename: Olivier
authors.initials: O
authors.lastname: Roubeau
authors.forename: Jan
authors.initials: J
authors.lastname: Reedijk