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Angew Chem Int Ed Engl. 2017 Sep 4;56(37):11209-11212. doi: 10.1002/anie.201704221. Epub 2017 Jun 20.

Cold Snapshot of a Molecular Rotary Motor Captured by High-Resolution Rotational Spectroscopy.

Author information

1
Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761, Hamburg, Germany.
2
Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607, Hamburg, Germany.
3
Stratingh Institute for Chemistry and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747, AG, Groningen, The Netherlands.
4
Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098, XH, Amsterdam, The Netherlands.
5
Christian-Albrechts-Universität zu Kiel, Institute of Physical Chemistry, Max-Eyth-Strasse 1, 24118, Kiel, Germany.

Abstract

We present the first high-resolution rotational spectrum of an artificial molecular rotary motor. By combining chirped-pulse Fourier transform microwave spectroscopy and supersonic expansions, we captured the vibronic ground-state conformation of a second-generation motor based on chiral, overcrowded alkenes. The rotational constants were accurately determined by fitting more than 200 rotational transitions in the 2-4 GHz frequency range. Evidence for dissociation products allowed for the unambiguous identification and characterization of the isolated motor components. Experiment and complementary quantum-chemical calculations provide accurate geometrical parameters for the C27 H20 molecular motor, the largest molecule investigated by high-resolution microwave spectroscopy to date.

KEYWORDS:

high-resolution spectroscopy; large molecules; microwave spectroscopy; molecular motors; structure elucidation

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