title: Direct C-C coupling of two Ni-salphen complexes to yield dinickel-disalphen complexes with symmetric and non-symmetric substitution-patterns.
abstract: The synthesis of symmetric and non-symmetric 5,5'-linked disalophen Ni(ii) complexes by the Suzuki-Miyaura-reaction is reported. Also, the synthesis and structural characterization of four Ni(ii)-precursor complexes are presented. The 5-Br-substituted mononuclear complexes and are coupled to the pinacolborane substituted complexes and yielding the four dinuclear dinickel complexes in good yields. The crystal structure of dinuclear complex was obtained revealing a coplanar arrangement between the two salophen fragments. Electronic spectra as well as DFT-calculations on the ground states and excitation energies are reported and they reveal a small coupling between the electronically saturated Ni-salophen complexes.
authors.affiliation: Institute for Inorganic and Applied Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany.
authors.forename: B E C
authors.initials: BE
authors.lastname: Bugenhagen
authors.affiliation: Institute for Physical Chemistry, TU Kaiserslautern, Erwin-Schrödinger-Str. 52, 67663 Kaiserslautern, Germany. prosenc@chemie.uni-kl.de.
authors.forename: M H
authors.initials: MH
authors.lastname: Prosenc