Electrohydrodynamic Mass Spectrometric Studies of Some Polyether-Cation Complexes

摘要

The relative stability constants (k sub s) of complexes of 18-crown-6 (18C6) with various cations in glycerol have been assessed with electrohydrodynamic mass spectrometry (EHMS). The results clearly corroborate the importance of steric compatability between the cation and the cavity of the crown. The mass spectral data uniquely reflect the effects of solvation and ion pairing in the formation of these complexes through the resolution of differently solvated and ion-paired species. The high sensitivity of EHMS enables the measurement of k sub s for weakly bound complexes (L(+)18C6 and (CH3)4N(+)18C6) which have not been detected by other methods.