Abstract

European Journal of Mass Spectrometry
Volume 16 Issue 1, Pages 163–168 (2010)
doi: 10.1255/ejms.1029

Self-assembly of quaterpyridine ligands and Cu⁺ cation into helical complexes of 2:2 stoichiometry under ESI condition

Monika Wałęsa-Chorab, Monika Patroniak, Grzegorz Schroeder and Rafał Frański^*
Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland. E-mail: franski@main.amu.edu.pl

Solutions containing quaterpyridine ligand 1 and Cu²⁺ cation were analysed by electrospray ionisation mass spectrometry (ESI-MS). It was found that copper reduction under ESI conditions and self-assembly of 1 and Cu(I) led to the formation of the 2:2 stoichiometry complex. Such stoichiometry is characteristic of helical complex of quaterpyridine ligand with Cu(I). The isotope pattern characteristic of [Cu₂1₂]²⁺ ion and different from that of [Cu1]⁺ ion, is observed. When using methanol as solvent, only [Cu₂1₂]²⁺ ions are observed in mass spectrum obtained at low cone voltage. At higher cone voltage [Cu₂1₂]²⁺ ion easy dissociates producing [Cu1]⁺ ion. When using other solvents studied, water and acetonitrile, 2:2 stoichiometry complex is formed, but along with complexes of other stoichiometries. Helical complex was not observed for silver cation for which only 1:1 stoichiometry complex was observed (ion [Ag1]⁺).

Keywords: quaterpyridine, copper complexes, helical complexes, self-assembly, electrospray ionisation mass spectrometry

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