AI Article Synopsis
- A modular molecular kit was developed to easily create various crystalline molecular rotors, combining different stators and rotators for diverse physical properties and dynamic performances.
- The rotors were self-assembled using a specific rotator (diazabicyclo[2.2.2]octane) and five fluorine-substituted iodobenzenes as stators.
- Measurements showed these rotors rotate very quickly, with low energy barriers for activation, and analysis of NMR data indicated their rotational behaviors align with specific symmetric potential patterns.
Article Abstract
A modular molecular kit for the preparation of crystalline molecular rotors was devised from a set of stators and rotators to gain simple access to a large number of structures with different dynamic performance and physical properties. In this work, we have accomplished this with crystalline molecular rotors self-assembled by halogen bonding of diazabicyclo[2.2.2]octane, acting as a rotator, and a set of five fluorine-substituted iodobenzenes that take the role of the stator. Using variable-temperature (1)H T1 spin-lattice relaxation measurements, we have shown that all structures display ultrafast Brownian rotation with activation energies of 2.4-4.9 kcal/mol and pre-exponential factors of the order of (1-9) × 10(12) s(-1). Line shape analysis of quadrupolar echo (2)H NMR measurements in selected examples indicated rotational trajectories consistent with the 3-fold or 6-fold symmetric potential of the rotator.
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| http://dx.doi.org/10.1021/jacs.5b10776 | DOI Listing |
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