Direct access to polyisocyanide screw sense using vibrational circular dichroism

Erik Schwartz, E. Schwartz, Sergio R. Domingos, Alexander Vdovin, Matthieu Koepf, Jeroen Johannes Lambertus Maria Cornelissen, Wybren Jan Buma, Alan E. Rowan, Roeland J.M. Nolte, Sander Woutersen

Research output: Contribution to journalArticleAcademicpeer-review

30 Citations (Scopus)

Abstract

We show that the screw sense of polyisocyanide helices can be determined in a simple manner from the vibrational circular dichroism (VCD) of their CN-stretching mode. The relation between VCD and molecular structure is obtained using the coupled-oscillator approximation. It is shown that since the C═N groups point approximately radially outward from the helical axis, the CN-stretch region of the VCD spectrum of a polyisocyanide helix consists of a single couplet, the sign of which is directly related to the screw sense of the helix. We use this method to determine the screw sense of poly(R)-2-isocyanooctane and poly(S)-2-isocyanooctane from their VCD spectrum.
Original languageEnglish
Pages (from-to)7931-7935
Number of pages4
JournalMacromolecules
Volume43
Issue number19
DOIs
Publication statusPublished - 2010

Keywords

  • IR-74121
  • METIS-273728

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