Catechol Thioesters: Ligands for Hierarchically Formed Lithium-Bridged Titanium(IV) Helicates and Helicate-Based Switches |
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| Authors: | A Carel N Kwamen Gilles S de Macedo Constanze Wiederhold Prof Dr Iris M Oppel Prof Dr Markus Albrecht |
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| Institution: | 1. Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany;2. Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany |
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| Abstract: | The thioester moiety is introduced as a lithium binding unit for the hierarchical formation of titanium(IV) catecholate-based lithium-bridged helicates. In solution, the coordination compounds show a monomer–dimer equilibrium which —in comparison to the oxo esters— is significantly shifted towards the monomers. In addition, the influence of the thioester side chain on the dimerization behavior is investigated and an expansible/compressible molecular switch is synthesized. In the latter case expansion and compression are performed reversibly in methanol, whereas in DMSO spontaneous expansion occurs. |
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| Keywords: | helicates molecular switches self-assembly thermodynamics titanium |
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