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Related Experiment Videos

Crankshaft motion in a highly congested bis(triarylmethyl)peroxide.

Tinh-Alfredo V Khuong1, Gerardo Zepeda, Carlos N Sanrame

  • 1Department of Chemistry and Biochemistry, University of California-Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90095-1569, USA.

Journal of the American Chemical Society
|November 13, 2004
PubMed
Summary

Researchers investigated crankshaft motion in a model molecule, Bis-[tri-(3,5-di-tert-butyl)phenylmethyl]-peroxide 2. Nuclear Magnetic Resonance (NMR) spectroscopy provided evidence for internal rotor rotation, confirming crankshaft motion at the molecular level.

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Area of Science:

  • Organic Chemistry
  • Solid-State Chemistry
  • Spectroscopy

Background:

  • Crankshaft motion involves internal rotors rotating circularly while terminal rotors remain static.
  • Investigating molecular motion in the solid state is crucial for understanding material properties.

Purpose of the Study:

  • To experimentally verify crankshaft motion at the molecular level.
  • To use Bis-[tri-(3,5-di-tert-butyl)phenylmethyl]-peroxide 2 as a model system to study this motion.

Main Methods:

  • Variable-temperature Carbon-13 ((13)C) and Proton (1H) Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Solid-state (13)C CPMAS NMR and GIAO calculations.
  • Molecular mechanics calculations.

Main Results:

Related Experiment Videos

  • Conformational dynamics consistent with crankshaft motion were observed in peroxide 2 between 190 and 375 K.
  • NMR spectral assignments supported two distinct coalescence processes.
  • Calculations differentiated crankshaft rotation from trityl group slippage.

Conclusions:

  • Experimental evidence supports the occurrence of crankshaft motion in the model peroxide molecule.
  • The study validates the use of NMR spectroscopy and computational methods to probe molecular dynamics in solids.