Methods of Solution of a System of First-order and Pseudofirst-order Consecutive Reactions Based on Time Dependence of UV-VIS Spectra

Page: 851

J. Hanuseka and J. Svobodab

a Department of Organic Chemistry, Faculty of Chemical Technology, University of Pardubice, b Joint Laboratory of Solid State Chemistry of Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, and University of Pardubice


The article deals with the methods of obtaining rate constants of first-order and pseudofirst-order consecutive reactions from time dependences of UV-VIS spectra, either whole or at selected wavelengths, and gives a method of unambiguous assignment of the constants to individual reaction steps. Common linearization methods of evaluation of the constants at a single wavelength were compared with the methods based on simple nonlinear regression combined with the principal component methods in a model system of 4-chloro-N-(4-nitrophenyl)butanamide. The precision of the methods was further compared with independent experimental second-order rate constants.


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