Spacer-Controlled Supramolecular Assemblies of Cu(II) with Bis(2-Hydroxyphenylimine) Ligands. from Monoligand Complexes to Double-Stranded Helicates and Metallomacrocycles

作者：Kelly Norman; Taube Franziska; Gloe Kerstin; Doert Thomas; Seichter Wilhelm; Heine Axel; Weigand Jan J^*; Gloe Karsten

来源：Crystals, 2016, 6(9): 120.

DOI：10.3390/cryst6090120

• self-assembly
• copper(II)
• Schiff bases
• coordination patterns
• helicates
• metallomacrocycles

Reaction of Cu(NO3)(2)center dot 3H(2)O or Cu(CH3COO)(2)center dot H2O with the bis(2-hydroxyphenylimine) ligands H2L1-H2L4 gave four Cu(II) complexes of composition [Cu-2(L-1)(NO3)(2)(H2O)]center dot MeOH, [Cu-2(L-2)(2)], [Cu-2(L-3)(2)] and [Cu-2(L-4)(2)]center dot 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.

• 出版日期2016-9