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Motion Capture and Manipulation of a Single Synthetic Molecular Rotor by Optical Microscopy.
- Source :
-
Angewandte Chemie International Edition . Sep2014, Vol. 53 Issue 38, p10082-10085. 4p. - Publication Year :
- 2014
-
Abstract
- Single-molecule imaging and manipulation with optical microscopy have become essential methods for studying biomolecular machines; however, only few efforts have been directed towards synthetic molecular machines. Single-molecule optical microscopy was now applied to a synthetic molecular rotor, a double-decker porphyrin (DD). By attaching a magnetic bead (ca. 200 nm) to the DD, its rotational dynamics were captured with a time resolution of 0.5 ms. DD showed rotational diffusion with 90° steps, which is consistent with its four-fold structural symmetry. Kinetic analysis revealed the first-order kinetics of the 90° step with a rate constant of 2.8 s−1. The barrier height of the rotational potential was estimated to be greater than 7.4 kJ mol−1 at 298 K. The DD was also forcibly rotated with magnetic tweezers, and again, four stable pausing angles that are separated by 90° were observed. These results demonstrate the potency of single-molecule optical microscopy for the elucidation of elementary properties of synthetic molecular machines. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14337851
- Volume :
- 53
- Issue :
- 38
- Database :
- Academic Search Index
- Journal :
- Angewandte Chemie International Edition
- Publication Type :
- Academic Journal
- Accession number :
- 97982419
- Full Text :
- https://doi.org/10.1002/anie.201403091