Abstract

European Journal of Mass Spectrometry
Volume 12 Issue 5, Pages 311–316 (2006)
doi: 10.1255/ejms.827

Influence of solvent and counter ion on copper complexes with N-alkyl-pyridine-2-carboxamides as studied by electrospray ionization mass spectrometry

Rafał Frański,^a,* Karolina Klonowska-Wieszczyck^a,b Aleksandra Borowiak-Resterna^b and Andrzej Olszanowski^b
a Adam Mickiewicz University, Faculty of Chemistry, Grunwaldzka 6, 60-780 Poznań, Poland. E-mail: mailto:franski@main.amu.edu.pl
^b Poznań University of Technology, Institute of Chemical Technology and Engineering, PL. M. Skłodowskiej-Curie 2, 60-965 Poznań, Poland

The interactions of copper(II) with N-alkyl-pyridine-2-carboxamides (M) were studied by electrospray ionization mass spectrometry. The influence of solvent and counter ion (Cl^–, ClO₄^–) on the type of ions (complexes) observed was discussed. By cone voltage increase, the fragmentation “in source” of the ions discussed was achieved. In methanol solution containing N-alkyl-pyridine-2-carboxamide (M) and CuCl₂ the singly- and doubly charged-ions [M + CuCl]⁺ and [M₂ + Cu]⁺² were detected. In acetonitrile solution containing N-alkyl- pyridine-2-carboxamide and CuCl₂, the copper(I)-containing ions [M + CH₃CN+Cu]⁺ were formed. The use of Cu(ClO₄)₂ instead of CuCl₂ resulted in more abundant doubly-charged ions in both methanol and acetonitrlile solutions and, for the former solution, the ions containing methoxyl anion, namely [M + CuOCH₃]⁺, were observed. When water was used as a solvent, the abundant ions corresponding to the protonated ligands were formed, while the ions corresponding to copper complexes were characterised by low abundances.

Keywords: N-alkyl- pyridine-2-carboxamides, copper complexes, electrospray ionization

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