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Preparation of Cyclodextrin–Iron Species in Water by Laser Ablation: Secondary Ion Mass Spectrometry
Author(s) -
Halaszova Sona,
Jerigova Monika,
Lorenc Dusan,
Velic Dusan
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201500215
Subject(s) - chemistry , adduct , supramolecular chemistry , cyclodextrin , laser ablation , molecule , mass spectrometry , ion , crystallography , analytical chemistry (journal) , inorganic chemistry , laser , organic chemistry , chromatography , physics , optics
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 Fe x O y + ( 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 (C 6 H 8 O 4 + ) associated with Fe + , FeO + , and Fe 2 O + 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 C 42 H 67 O 35 FeNa + , which corresponds to a cyclodextrin molecule minus three H atoms. Two possible explanations of this finding are the presence of the host–guest C 42 H 67 O 35 Na–Fe complex, in which Fe is in the cavity, or the presence of the adduct C 42 H 67 O 34 Na–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 C 42 H 70 O 35 Na–Fe complex and an estimated Fe/FeO ratio of approximately 10 2 , host–guest formation is assumed to be more significant.