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Crystals 2016, 6(9), 120; doi:10.3390/cryst6090120

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

1
Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
2
Institute of Organic Chemistry, Technische Universität Bergakademie Freiberg, 09596 Freiberg, Germany
Dedicated to Professor Peter Mühl on the occasion of his 85th birthday.
*
Authors to whom correspondence should be addressed.
Academic Editor: Helmut Cölfen
Received: 28 August 2016 / Revised: 13 September 2016 / Accepted: 14 September 2016 / Published: 21 September 2016
(This article belongs to the Special Issue Crystal Structure of Complex Compounds)
View Full-Text   |   Download PDF [6557 KB, uploaded 21 September 2016]   |  

Abstract

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. View Full-Text
Keywords: self-assembly; copper(II); Schiff bases; coordination patterns; helicates; metallomacrocycles self-assembly; copper(II); Schiff bases; coordination patterns; helicates; metallomacrocycles
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kelly, N.; Taube, F.; Gloe, K.; Doert, T.; Seichter, W.; Heine, A.; Weigand, J.J.; Gloe, K. Spacer-Controlled Supramolecular Assemblies of Cu(II) with Bis(2-Hydroxyphenylimine) Ligands. from Monoligand Complexes to Double-Stranded Helicates and Metallomacrocycles
. Crystals 2016, 6, 120.

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