ESI MS/MS Study of Calix[4]arene Derivatives and their Metal Complexes

Abstract

, Yb 3+ ) were analyzed by ESI MS. The influences of the solvent (acetonitrile, methanol, addition of formic acid or sodium acetate) and the calixarene:cation molar ratio on signal intensities were investigated. Comprehensive MS/MS analyses were performed of all singly and doubly charged ions of 1-3 and their complexes, and fragmentation pathways were proposed. An inductive cleavage was observed during dissociation of protonated ions, while the presence of alkali-metal or lanthanide cations caused homolytic cleavage and formation of radical cations. The results of MS analysis were in accordance with those obtained by other techniques (spectrophotometric, potentiometric, and conductometric titrations). The MS/MS experiments could be used as fast and sensitive method for prediction of relative stabilities of calixarene complexes with metal ions. (doi: 10.5562/cca2125)

UV-Vis and ESI MS/MS Study of Calix[4]arene Derivatives and Their Lanthanide Complexes

“…The peaks corresponding to aducts with impurities already present in the system (Na + , K + , NH4 + ) are usually observed in MS spectra of calixarene derivatives. 9,15 MS/MS analyses of singly protonated molecular ions of calixarene derivatives 1-3 were performed at different collision energies, from 5 to 50 eV, and the fragmentation schemes were proposed. As an example, the MS/MS spectrum of 1 and corresponding fragmentation scheme are shown in Figure 4 and Scheme 2.…”

“…[15] In this work, we present UV-Vis spectroscopic and mass spectrometric investigations of ester and amide derivatives of calix [4] …”