Anion binding by bambus[6]uril probed in the gas phase and in solution
Language English Country United States Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
21888366
DOI
10.1021/jp205218k
Knihovny.cz E-resources
- MeSH
- Anions chemistry MeSH
- Spectrometry, Mass, Electrospray Ionization MeSH
- Imidazoles chemistry MeSH
- Macrocyclic Compounds chemistry MeSH
- Models, Molecular MeSH
- Molecular Structure MeSH
- Gases chemistry MeSH
- Solutions MeSH
- Binding Sites MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Anions MeSH
- bambus(6)uril MeSH Browser
- Imidazoles MeSH
- Macrocyclic Compounds MeSH
- Gases MeSH
- Solutions MeSH
Electrospray ionization mass spectrometry (ESI-MS) is used to probe the binding of small anions to the macrocycle of bambus[6]uril. For the halide ions, the experimental patterns suggest F(-) < Cl(-) < Br(-) < I(-), which is consistent with the order of anion binding found in the condensed phase. Parallel equilibrium studies in the condensed phase establish the association constants of halide anions and bambus[6]uril in mixed solvents. A detailed analysis of the mass spectrometric data is used to shed light on the correlations between the binding constants in the condensed phase and the ion abundances observed using ESI-MS. From the analysis it becomes apparent that ESI-MS can indeed represent the situation in solution to some extent, but the sampling in the gas-phase experiment is not 1:1 compared to that in solution.
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