Communication: Probing the absolute configuration of chiral molecules at aqueous interfaces

DOI PDF 3 Citations
  • Stephan Lotze
    FOM Institute for Atomic and Molecular Physics 1 , Science Park 104, 1098 XG Amsterdam, The Netherlands
  • Jan Versluis
    FOM Institute for Atomic and Molecular Physics 1 , Science Park 104, 1098 XG Amsterdam, The Netherlands
  • Luuk L. C. Olijve
    Eindhoven University of Technology 2 Laboratory of Macromolecular and Organic Chemistry, Department of Chemical Engineering and Chemistry, and Institute for Complex Molecular Systems, , P.O. Box 513, 5600 MB Eindhoven, The Netherlands
  • Luuk van Schijndel
    Eindhoven University of Technology 2 Laboratory of Macromolecular and Organic Chemistry, Department of Chemical Engineering and Chemistry, and Institute for Complex Molecular Systems, , P.O. Box 513, 5600 MB Eindhoven, The Netherlands
  • Lech G. Milroy
    Eindhoven University of Technology 2 Laboratory of Macromolecular and Organic Chemistry, Department of Chemical Engineering and Chemistry, and Institute for Complex Molecular Systems, , P.O. Box 513, 5600 MB Eindhoven, The Netherlands
  • Ilja K. Voets
    Eindhoven University of Technology 2 Laboratory of Macromolecular and Organic Chemistry, Department of Chemical Engineering and Chemistry, and Institute for Complex Molecular Systems, , P.O. Box 513, 5600 MB Eindhoven, The Netherlands
  • Huib J. Bakker
    FOM Institute AMOLF 3 , Science Park 104, 1098 XG Amsterdam, The Netherlands

Abstract

<jats:p>We demonstrate that the enantiomers of chiral macromolecules at an aqueous interface can be distinguished with monolayer sensitivity using heterodyne-detected vibrational sum-frequency generation (VSFG). We perform VSFG spectroscopy with a polarization combination that selectively probes chiral molecular structures. By using frequencies far detuned from electronic resonances, we probe the chiral macromolecular structures with high surface specificity. The phase of the sum-frequency light generated by the chiral molecules is determined using heterodyne detection. With this approach, we can distinguish right-handed and left-handed helical peptides at a water-air interface. We thus show that heterodyne-detected VSFG is sensitive to the absolute configuration of complex, interfacial macromolecules and has the potential to determine the absolute configuration of enantiomers at interfaces.</jats:p>

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