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

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.

SUBMITTER: Domingos SR

PROVIDER: S-EPMC5599986 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature

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

Domingos Sérgio R SR Cnossen Arjen A Buma Wybren J WJ Browne Wesley R WR Feringa Ben L BL Schnell Melanie M

Angewandte Chemie (International ed. in English) 20170620 37

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 unambi ...[more]

PMID: 28556402

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