4.3 Article

The Honeysuckle and the Bindweed Revisited: Synthesis and Stereochemistry of Extended Helical Structures from Coordination Complexes

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HELVETICA CHIMICA ACTA
卷 -, 期 -, 页码 -

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WILEY-V C H VERLAG GMBH
DOI: 10.1002/hlca.202300120

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chirality; cobalt; helical structures; manganese; supramolecular chemistry

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This study investigates the structural properties of a chiral ligand forming helical cubanes with cobalt(II) and manganese(II). It is found that a (P)-quadruple helicate can be obtained with a (S)-ligand and cobalt(II). However, when the ligand binds to manganese(II), there are two possible orientations, resulting in the observation of either (P)- or (M)-quadruple helicates for a given ligand enantiomer. The helicates can be linked into extended structures by p-nitrobenzoate capping ligands, which exhibit stacking interactions with neighboring complexes. Interestingly, the study reveals the presence of extended (M)-helices coexisting with extended (P)-helices when manganese(II) is used.
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. image

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