Direct observation of rhodamine dimer structures in water

P. Ilich, P. K. Mishra, S. Macura, T. P. Burghardt

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


Self-association of rhodamine B, rhodamine 6G, and their mixture in aqueous solution has been studied by two-dimensional proton-proton nuclear Overhauser effect spectroscopy in the laboratory (NOESY) and rotating frames (ROESY). The strength of the observed cross-peaks between protons that are distant in the rhodamine monomer demonstrates intermolecular proximity between homodimers of rhodamine B and rhodamine 6G, and between heterodimers of rhodamine B and rhodamine 6G. It is shown that stacking of the xanthene rings occurs in all homo- and heterodimer interactions.

Original languageEnglish (US)
Pages (from-to)1323-1330
Number of pages8
JournalSpectrochimica Acta - Part A Molecular Spectroscopy
Issue number10
StatePublished - 1996


  • 2D proton NMR
  • Dimer conformation
  • Intermolecular distance
  • Self-association
  • Xanthene dye

ASJC Scopus subject areas

  • Engineering(all)


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