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The Honeysuckle and the Bindweed Revisited: Synthesis and Stereochemistry of Extended Helical Structures from Coordination Complexes |
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| Authors: | Alan M Downward Matteo Granelli Celine Besnard Laure Guénée Alan F Williams |
| Institution: | 1. Department of Inorganic and Analytical Chemistry, University of Geneva, 30 quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland E-mail: Alan
Contribution: Data curation (equal), Investigation (equal), Methodology (equal);2. Department of Inorganic and Analytical Chemistry, University of Geneva, 30 quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland E-mail: Alan Contribution: Investigation (equal), Writing - review & editing (supporting);3. Laboratory for X-ray Crystallography, University of Geneva, 24 quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland;4. Laboratory for X-ray Crystallography, University of Geneva, 24 quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland Contribution: Data curation (equal), Formal analysis (equal), Investigation (equal), Writing - review & editing (equal);5. Department of Inorganic and Analytical Chemistry, University of Geneva, 30 quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland E-mail: Alan |
| Abstract: | We report structural studies of a chiral tridentate ligand which forms helical cubanes with cobalt(II) and manganese(II). A quadruple helicate with (P)-chirality is obtained using a (S)-ligand with cobalt(II) but the ligand binds manganese(II) in one of two possible orientations and either (P)- or (M)-quadruple helicates may be observed for a given ligand enantiomer. The helicates may be linked into extended structures by p-nitrobenzoate capping ligands which show stacking interactions with neighbouring complexes. With cobalt(II) we find an extended helical structure with (M)-chirality linking helicates which themselves have (P)-chirality. With manganese(II) we observe a remarkable structure with extended (M)-helices coexisting with extended (P)-helices. |
| Keywords: | chirality cobalt helical structures manganese supramolecular chemistry |