Unravelling the electronic structure and dynamics of an isolated molecular rotary motor in the gas-phase

Beekmeyer, Reece and Parkes, Micheal A. and Ridgwell, Luke and Riley, Jamie W and Chen, Jiawen and Feringa, Ben L. and Kerridge, Andrew and Fielding, Helen H. (2017) Unravelling the electronic structure and dynamics of an isolated molecular rotary motor in the gas-phase. Chemical Science, 8 (6141). pp. 6141-6148. ISSN 2041-6520

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Abstract

Light-driven molecular motors derived from chiral overcrowded alkenes are an important class of compounds in which sequential photochemical and thermal rearrangements result in unidirectional rotation of one part of the molecule with respect to another. Here, we employ anion photoelectron spectroscopy to probe the electronic structure and dynamics of a unidirectional molecular rotary motor anion in the gas-phase and quantum chemistry calculations to guide the interpretation of our results. We find that following photoexcitation of the first electronically excited state, the molecule rotates around its axle and some population remains on the excited potential energy surface and some population undergoes internal conversion back to the electronic ground state. These observations are similar to those observed in time-resolved measurements of rotary molecular motors in solution. This work demonstrates the potential of anion photoelectron spectroscopy for studying the electronic structure and dynamics of molecular motors in the gas-phase, provides important benchmarks for theory and improves our fundamental understanding of light-activated molecular rotary motors, which can be used to inform the design of new photoactivated nanoscale devices.

Item Type:
Journal Article
Journal or Publication Title:
Chemical Science
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1600
Subjects:
ID Code:
87426
Deposited By:
Deposited On:
22 Aug 2017 10:46
Refereed?:
Yes
Published?:
Published
Last Modified:
29 Sep 2020 03:42