A Quantitative Approach of the Interaction between Metal Triflates and Organic Ligands Using Electrospray Mass Spectrometry |
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Authors: | Jean-Fran?ois Gal Claudio Iacobucci Ilaria Monfardini Lionel Massi Elisabet Du?ach Sandra Olivero |
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Institution: | 1. Institut de Chimie de Nice, Universit?? de Nice-Sophia Antipolis, CNRS-UMR 7272, Parc Valrose, 06108, Nice Cedex 2, France
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Abstract: | The interaction between two Lewis ??superacid?? catalysts Zn(OTf)2 and In(OTf)3 and series of amide and phosphate ligands is quantitatively characterized by electrospray ionization mass spectrometry (ESI-MS). A specific feature of the ESI-MS spectra of the mixture of metal triflates and Lewis bases is the formation of ionic adducts resulting from the displacement of one triflate anion by two neutral ligands. A ligand competition model is developed, which describes the relative intensities of the ionic adducts as a function of relative ligand concentrations. The relative affinities deduced from the ligand competition method are combined in an affinity scale for the metal triflate. |
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