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Tytuł artykułu

Kinetics of the reaction of CIS - and trans-PtCl4(NH3)2 Complexes in Aqueous Solution, in the Presence of Ethanol

Identyfikatory
Warianty tytułu
EN
Kinetyka reakcji kompleksów CIS- i trans-PtCl4 (NH3)2 w roztworze wodnym, w obecności etanolu
Języki publikacji
EN
Abstrakty
EN
In this work the kinetic data for the reactions of cis- and trans-PtCl4(NH3)2 complexes with ethanol have been determined. Obtained values of the rate constants determined for different conditions of reactants concentration as well as different temperature indicate that in aqueous solution with pH = 12 the reaction is relatively slow and leads to the cis- and trans-PtCl2(NH3)2 species formation, respectively. Using obtained kinetic results, supported with DFT calculations, the possible mechanism of electron transfer involving the chloride ligand-ethanol bridge formation has been suggested. It was found that the values of enthalpy and entropy of activation correlate well with the difference between the rate constants of both reacting pairs as well as with the difference between HOMO and LUMO energy levels of reagents. From the obtained results, the parallel paths of the cis- and trans-PtCl4(NH3)2 reactions, i.e. reduction and hydrolysis of platinum(IV) complexes, were also suggested.
PL
W artykule przedstawiono dane kinetyczne reakcji kompleksów cis- i trans-PtCIJNHJ2 z etanolem. Wartości stałych szybkości wyznaczone w różnych warunkach stężenia reagentów oraz w różnych temperaturach wskazują, że w roztworach wodnych o pH =12, reakcja jest względnie wolna i prowadzi to utworzenia odpowiednio cis- itrans-PtO2(NHj2. Używając otrzymanych danych kinetycznych oraz obliczeń DFJ, zaproponowano możliwy mechanizm przekazania elektronu obejmujący utworzenie mostka: Ugand chlorkowy-etanol. Wykazano, że wartości entalpii i entropii aktywacji dobrze korelują z różnicą pomiędzy stałymi szybkości reakcji obydwu par reagentów, jak również z różnicą pomiędzy poziomami ener¬getycznymi HOMO i UJMO reagentów. Na podstawie otrzymanych danych oraz dyskusji wyników zaproponowano równoległe ścieżki reakcji cis-i trans-PtCIJNHJj takie jak redukcję i hydrolizę platyny(IV).
Rocznik
Strony
435--443
Opis fizyczny
Bibliogr. 33 poz., rys., tab.
Twórcy
  • AGH University of Science and Technology, Faculty of Non-Ferrous Metals, Labolatory of Physico-Chemistry and Metallurgy of Non-Ferrous Metals, 30 Mickiewicz Ave., 30-059 Krakow, Poland
  • AGH University of Science and Technology, Faculty of Non-Ferrous Metals, Labolatory of Physico-Chemistry and Metallurgy of Non-Ferrous Metals, 30 Mickiewicz Ave., 30-059 Krakow, Poland
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-a16ef1ab-48e1-4a27-9773-9c49c6df787f
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