Original scientific paper

Gas Phase Kinetics of Metal Ion Ligation by Pyrene

Tomislav Cvitaš ; Laboratory for Chemical Kinetics and Atmospheric Chemistry, Ruđer Bošković Institute, 10002 Zagreb, Croatia
Saša Kazazić ; Laboratory for Chemical Kinetics and Atmospheric Chemistry, Ruđer Bošković Institute, 10002 Zagreb, Croatia
Snježana Kazazić ; Laboratory for Chemical Kinetics and Atmospheric Chemistry, Ruđer Bošković Institute, 10002 Zagreb, Croatia
Nenad Kezele ; Laboratory for Chemical Kinetics and Atmospheric Chemistry, Ruđer Bošković Institute, 10002 Zagreb, Croatia
Leo Klasinc ; Laboratory for Chemical Kinetics and Atmospheric Chemistry, Ruđer Bošković Institute, 10002 Zagreb, Croatia
Dunja Srzić ; Laboratory for Chemical Kinetics and Atmospheric Chemistry, Ruđer Bošković Institute, 10002 Zagreb, Croatia
Herbert Budzikiewicz ; Institut für Organische Chemie der Universität zu Köln, D-50939 Köln, Germany

Abstract

Investigation of simple ligation reactions of metal M+ ions with pyrene (Py) within the ICR FT mass spectrometer indicates relatively fast consecutive formation of MPy+ and MPy₂+ ions, and if E_i(M+) > E_i(Py) accompanied also by formation of Py+ due to charge exchange. The much slower reaction and equilibrium Py+ + Py ⇌ Py₂+, for which the thermodynamic parameters are known, makes it possible to determine the concentration of Py during the ligation reactions and to calculate the second order rate constants from the set of pseudo first order constants obtained by iterative nonlinear least square fitting of experimental »snapshot« mass spectral data with the proposed kinetic scheme.

Keywords

ligation reaction; charge exchange reaction; gas phase kinetics; iron(+); chromium(+); pyrene; pyrene(+); dipyrene(+); gas phase equilibrium

Hrčak ID:

131931

URI

https://hrcak.srce.hr/131931

Publication date:

1.8.2001.

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