Chalcogen-Bond-Induced Double Helix Based on Self-Assembly of a Small Planar Building Block |
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Authors: | Saber Mehrparvar Christoph Wölper Gebhard Haberhauer |
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Institution: | Fakultät für Chemie, Universität Duisburg-Essen, Universitätsstr. 7, 45117 Essen, Germany |
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Abstract: | As a rule, helical structures at the molecular level are formed by non-planar units. This makes the design of helices, starting from planar building blocks via self-assembly, even more fascinating. Until now, however, this has only been achieved in rare cases, where hydrogen and halogen bonds were involved. Here, we show that the carbonyl-tellurium interaction motif is suitable to assemble even small planar units into helical structures in solid phase. We found two different types of helices: both single and double helices, depending on the substitution pattern. In the double helix, the strands are connected by additional Te⋅⋅⋅Te chalcogen bonds. In the case of the single helix, a spontaneous enantiomeric resolution occurs in the crystal. This underlines the potential of the carbonyl-tellurium chalcogen bond to generate complex three-dimensional patterns. |
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Keywords: | Chalcogen Bond DFT Calculations Double Helix Self-Assembly |
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