Infrared spectroscopy and Raman spectroscopy of cyclodextrin derivatives and their ferrocene inclusion complexes

Cyclodextrins (CD) are cyclic oligosaccharides that are composed of five or more α-d-glucopyranoside units arranged to form molecular cavities with β-cyclodextrin consisting of seven anhydroglucose units. The inclusion of ferrocene as a guest molecule in a β-cyclodextrin derivative monomer (monochlorotriazinyl-β-cyclodextrin) and in a derivative bound to cotton fabrics has been studied by infrared spectroscopy and Raman spectroscopy. The stability of the inclusion complex could be proven, although ferrocene itself shows a rather high sublimation pressure at room temperature. Raman spectroscopy delivers more significant and straight-forward structural information than the much less pronounced infrared spectral changes of the inclusion complex when compared to the spectra of water-loaded cyclodextrin cavities.