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Related Experiment Videos

sp-9-(o-Methylphenyl)fluorene.

Cal Y Meyers1, Paul D Robinson, Aaron W McLean

  • 1Meyers Institute for Interdisciplinary Research in Organic and Medicinal Chemistry, and the Department of Chemistry and Biochemistry, Southern Illinois University-4409, Carbondale, IL 62901, USA.

Acta Crystallographica. Section C, Crystal Structure Communications
|February 10, 2004
PubMed
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Crystallization of 9-(o-methylphenyl)fluorene exclusively yields the sp rotamer, despite both sp and ap rotamers equilibrating in solution. This selective crystallization is influenced by steric interactions, favoring the less crowded sp conformation.

Area of Science:

  • Organic Chemistry
  • Crystallography
  • Spectroscopy

Background:

  • 9-(o-methylphenyl)fluorene exists in two rotameric forms: sp and ap.
  • These rotamers are observable in solution via Nuclear Magnetic Resonance (NMR) spectroscopy.
  • The rotational barriers allow for interconversion between sp and ap forms.

Purpose of the Study:

  • To investigate the conformational preferences of 9-(o-methylphenyl)fluorene during crystallization.
  • To determine the factors influencing the selective crystallization of one rotamer over the other.
  • To characterize the structure of the crystallized rotamer.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy to observe rotamers in solution.
  • X-ray crystallography to determine the solid-state structure.

Related Experiment Videos

  • Analysis of intramolecular distances and bond angles.

    • Main Results:

    • Both sp and ap rotamers of 9-(o-methylphenyl)fluorene were observed to equilibrate in solution.
    • Crystallization exclusively yielded the sp rotamer.
    • The sp conformation exhibits a small intramolecular distance between phenyl and fluorene rings (3.382 Å).
    • Steric hindrance from the o-CH(3) group in the ap conformation is predicted to be significant.
    • The angle between the fluorene and 9-aryl planes in the crystallized sp rotamer is 75.82°.

    Conclusions:

    • Crystallization conditions favor the formation of the sp rotamer of 9-(o-methylphenyl)fluorene.
    • Steric factors play a crucial role in dictating the observed conformation in the solid state.
    • The study provides insights into structure-property relationships in substituted fluorene derivatives.