Abstract
Kinetics and mechanism of the substitution reactions between [Ru(trpy)(bpy)Cl]+ with nucleophiles guanosine-5′-monophosphate, l-histidine, thiourea, and dimethylsulfoxide were studied spectrophotometrically in 0.1 M NaClO4 at 310 K. The observed order of reactivity for selected ligands is: thiourea > guanosine-5′-monophosphate > l-histidine > DMSO. This order is associated with the electronic, structural, and chemical characteristics of complex and nucleophiles. The substitution reaction with thiourea was studied at three different temperatures (288, 298, and 310 K). Negative entropy of activation ΔS ≠ confirms the associative mode of activation. The complex formation of [Ru(trpy)(bpy)H2O]2+ with ligands guanosine-5′-monophosphate and l-histidine was investigated by potentiometry and spectrophotometry as well. The stoichiometry and stability constants of the species formed in these systems were determined. The concentration distribution diagram of the various complexes has been evaluated as a function of pH. Comparing the calculated values for logβ, we determined that the product with nucleotide is more stable than the product with l-histidine.
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The authors gratefully acknowledge financial support from the Ministry of Education, Science, and Technological Development of the Republic of Serbia, Project 172011.
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Mijatović, A.M., Jelić, R.M., Bogojeski, J. et al. Kinetics, mechanism, and equilibrium studies of the reactions between a ruthenium(II) complex and some nitrogen- and sulfur-donor nucleophiles. Monatsh Chem 144, 1489–1498 (2013). https://doi.org/10.1007/s00706-013-1044-1
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DOI: https://doi.org/10.1007/s00706-013-1044-1