Anion Binding by Bambus[6]uril Probed in the Gas Phase and in Solution

作者：Revesz Agnes; Schroeder Detlef; Svec Jan; Wimmerova Michaela; Sindelar Vladimir

来源：Journal of Physical Chemistry A, 2011, 115(41): 11378-11386.

DOI：10.1021/jp205218k

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.

• 出版日期2011-10-20