Year-end Sale % OFF 
Abstract
Three distinct four-component supramolecular nanorotors were prepared, using, for the first time, bipyridine instead of phenanthroline stations in the stator. Following our established self-sorting protocol to multicomponent nanodevices, the nanorotors were self-assembled by mixing the stator, rotators with various pyridine head groups, copper(I) ions and 1,4-diazabicyclo[2.2.2]octane (DABCO). Whereas the exchange of a phenanthroline vs. a bipyridine station did not entail significant changes in the rotational exchange frequency, the para-substituents at the pyridine head group of the rotator had drastic consequences on the speed: 4-OMe (k298 = 35 kHz), 4-H (k298 = 77 kHz) and 4-NO2 (k298 = 843 kHz). The exchange frequency (log k) showed an excellent linear correlation with both the Hammett substituent constants and log K of the copper(I)–ligand interaction, proving that rotator–copper(I) bond cleavage is the key determining factor in the rate-determining step.
Highlights
Researchers have been probing numerous techniques to mimic the function of biological machines, such as ATP synthase [1,2], bacterial flagella [3], histidine kinase [4], etc
Because in multicomponent devices the exchange of a single component may lead to drastically different properties, fundamental insights are needed in how structural and electronic variations will impact on the kinetics of motion
We demonstrate that speed changes in four-component nanorotors by exclusively varying the rotator head group are linearly correlated with Hammett substituent constants
Summary
Researchers have been probing numerous techniques to mimic the function of biological machines, such as ATP synthase [1,2], bacterial flagella [3], histidine kinase [4], etc. To mimic nature’s strategy even closer, one has to realize that life preferentially uses multicomponent assembly for building biological machines. Such approach requires a careful balance of weak interactions that allow for sufficient spatiotemporal binding between components during motion. Because in multicomponent devices the exchange of a single component may lead to drastically different properties, fundamental insights are needed in how structural and electronic variations will impact on the kinetics of motion
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
