چكيده لاتين :
The coupling of 4-aminoantipyrine (4-AAP) with aniline derivatives catalyzed by ruthenium nanoparticles (Rnp) has been
studied by UV-Vis spectroscopy in aqueous medium. The rate constant for antipyrilquinoneimine dye formation depends on the
nature of the aniline substituent and the pH, ionic strength and temperature of the reaction medium. The maximum rate constant of
the dye formation reaction is observed at pH 3.6. Aniline derivatives with electron donating substituents show higher rate constant
values than those with electron withdrawing substituents, with increasing rate constant values in the order: N,N-dimethyl aniline >
o-toluidine > o-chloroaniline > m-chloroaniline. With pseudo first order kinetics, the total order is 1.0 + 1.0 + 1.0 = 3.0, which
includes the orders with respect to amine, 4-AAP and Rnp. Studies on these effects help to complete the kinetic analysis as well as
propose the reaction pathway. Furthermore, TEM measurement confirms that the nanoscalar size of the Rnp is 7 nm.
