Spacer-Controlled Supramolecular Assemblies of Cu(II) with Bis(2-Hydroxyphenylimine) Ligands. from Monoligand Complexes to Double-Stranded Helicates and Metallomacrocycles
Norman Kelly,
Franziska Taube,
Kerstin Gloe,
Thomas Doert,
Wilhelm Seichter,
Axel Heine,
Jan J. Weigand,
Karsten Gloe
Affiliations
Norman Kelly
Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
Franziska Taube
Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
Kerstin Gloe
Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
Thomas Doert
Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
Wilhelm Seichter
Institute of Organic Chemistry, Technische Universität Bergakademie Freiberg, 09596 Freiberg, Germany
Axel Heine
Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
Jan J. Weigand
Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
Karsten Gloe
Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
Reaction of Cu(NO3)2·3H2O or Cu(CH3COO)2·H2O with the bis(2-hydroxyphenylimine) ligands H2L1-H2L4 gave four Cu(II) complexes of composition [Cu2(L1)(NO3)2(H2O)]·MeOH, [Cu2(L2)2], [Cu2(L3)2] and [Cu2(L4)2]·2MeOH. Depending on the spacer unit, the structures are characterized by a dinuclear arrangement of Cu(II) within one ligand (H2L1), by a double-stranded [2+2] helical binding mode (H2L2 and H2L3) and a [2 + 2] metallomacrocycle formation (H2L4). In these complexes, the Cu(II) coordination geometries are quite different, varying between common square planar or square pyramidal arrangements, and rather rare pentagonal bipyramidal and tetrahedral geometries. In addition, solution studies of the complex formation using UV/Vis and ESI-MS as well as solvent extraction are reported.
