Dynamics of Hydrogen Bonding in Three-Component Nanorotors |
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| Authors: | Pronay Kumar Biswas Abir Goswami Suchismita Saha Prof. Dr. Michael Schmittel |
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| Affiliation: | 1. Center of Micro and Nanochemistry and Engineering, Organische Chemie I, University of Siegen, Adolf-Reichwein Str. 2, 57068 Siegen, Germany These authors contributed equally to this work.;2. Center of Micro and Nanochemistry and Engineering, Organische Chemie I, University of Siegen, Adolf-Reichwein Str. 2, 57068 Siegen, Germany |
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| Abstract: | The dynamics of hydrogen bonding do not only play an important role in many biochemical processes but also in Nature's multicomponent machines. Here, a three-component nanorotor is presented where both the self-assembly and rotational dynamics are guided by hydrogen bonding. In the rate-limiting step of the rotational exchange, two phenolic O-H–N,N(phenanthroline) hydrogen bonds are cleaved, a process that was followed by variable-temperature 1H NMR spectroscopy. Activation data (ΔG≠298=46.7 kJ mol−1 at 298 K, ΔH≠=55.3 kJ mol−1, and ΔS≠=28.8 J mol−1 K−1) were determined, furnishing a rotational exchange frequency of k298=40.0 kHz. Fully reversible disassembly/assembly of the nanorotor was achieved by addition of 5.0 equivalents of trifluoroacetic acid (TFA)/1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) over three cycles. |
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| Keywords: | hydrogen bonding multicomponent assembly rotational dynamics self-assembly self-sorting |
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