Preparation of Cyclodextrin-Iron Species in Water by Laser Ablation: Secondary Ion Mass Spectrometry

Supramolecular complexes between cyclodextrin and iron species are studied by using secondary ion mass spectrometry. The iron species are prepared by pulsed‐laser ablation of bulk iron in water; this gives Fe+ (56 m/z) and FexOy+ (x, y=1–7) species. Cyclodextrin is added to the water either before o...

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Bibliographic Details
Published in:Chemphyschem 2015-07, Vol.16 (10), p.2110-2113
Main Authors: Halaszova, Sona, Jerigova, Monika, Lorenc, Dusan, Velic, Dusan
Format: Article
Language:English
Subjects:
cyclodextrins
iron
Lasers
Mass spectrometry
pulsed-laser ablation
Scientific imaging
SIMS
supramolecular chemistry
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Summary:Supramolecular complexes between cyclodextrin and iron species are studied by using secondary ion mass spectrometry. The iron species are prepared by pulsed‐laser ablation of bulk iron in water; this gives Fe+ (56 m/z) and FexOy+ (x, y=1–7) species. Cyclodextrin is added to the water either before or after the laser ablation. When it is added before laser ablation, molecular fragments of cyclodextrin are detected as dehydrated glucopyranose units (C6H8O4+) associated with Fe+, FeO+, and Fe2O+ species. The focus is to observe supramolecular host–guest complexes or adducts between intact molecules of cyclodextrin and iron species. When cyclodextrin is added after laser ablation, the relevant peak at 1210 m/z is observed and assigned as C42H67O35FeNa+, which corresponds to a cyclodextrin molecule minus three H atoms. Two possible explanations of this finding are the presence of the host–guest C42H67O35Na–Fe complex, in which Fe is in the cavity, or the presence of the adduct C42H67O34Na–FeO with FeO on the outer surface; the formation of these complexes are supported by the hydrophobicity of Fe and hydrophilicity of FeO, respectively. Due to the presence of 12 % of intact C42H70O35Na–Fe complex and an estimated Fe/FeO ratio of approximately 102, host–guest formation is assumed to be more significant. The perfect host: A supramolecular host–guest complex between cyclodextrin and iron is detected by using secondary ion mass spectrometry. The iron species are prepared by laser ablation of bulk iron in water. A spectrum of a complex between an intact molecule of cyclodextrin and an iron species is obtained and the mass peak of 1210 m/z is assigned as C42H67O35FeNa+.
ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.201500215