Dynamics of Hydrogen Bonding in Three-Component Nanorotors.

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 ¹ H 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/as

SUBMITTER: Biswas PK 

PROVIDER: S-EPMC7702118 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature