Kinetics of the reaction of platinum (IV) chloride complex Ions in aqueous solution, in the presence of C2H5OH

• Autorzy: Pacławski K. , Karczewski K.

Identyfikatory

DOI

10.15199/67.2016.8.2

Warianty tytułu

EN

Kinetyka reakcji kompleksów chlorkowych platyny(IV) w roztworze wodnym, w obecności C2H5OH

• Języki publikacji: EN

Abstrakty

EN

In this work, the kinetic studies of the reaction of platinum (IV) chloride complexes ([PtCl6 ] 2-) with ethyl alcohol in aqueous solution were carried out. Obtained data suggest the complex character of the reaction which is sensitive to pH of the solution. It was found that in the alkaline solution two parallel reaction paths are present: hydrolysis and the redox reaction of [PtCl6 ] 2-. It leads to [PtCl5 (H2O)] - and [PtCl4 ] 2- ions formation in the system. Both reactions has bimolecular character and at 55oC and at pH =12, are described by the second-order rate constants: k1 = 0.085.10 -3 [M -1s -1] (for the hydrolysis) and k2 = 3.55.10 -3 [M -1s -1] (for the redox reaction). Experimentally determined values of enthalpy and entropy of activation for the hydrolysis reaction are equal to 23.654 [kJ mol -1] and -187.16 [J mol -1 K -1], respectively. The same parameters for the redox reaction are as follows: 24.016 [kJ mol -1] and -166.591 [J mol -1 K -1], respectively. As a result of data analysis it was also suggested that the ethyl alcohol may play a catalytic role during [PtCl6 ] 2- hydrolysis. Its presence leads to slight acceleration of this reaction and to slow Pt 4+ reduction.

PL

W pracy przedstawiono wyniki badań kinetycznych reakcji kompleksów chlorkowych platyny (IV) ([PKI6]2') z alkoholem ety/owym, w roztworach wodnych. Otrzymane dane sugerują złożony charakter reakcji, czuły na pH roztworu. Wykazano, że w roztworach alkalicznych obecne sq dwie rów¬noległe ścieżki reakcji: hydroliza i reakcja redoks [PtCI6]2'. Prowadzi to do utworzenia jonów [PtCI5(H20)]~ i[PtCIJ2' w układzie. Obydwie reakcją mają charakter dwucząsteczkowy i w temperaturze 55°Coraz przy pH= 12 sq opisane przez drugorzędowe stałe szybkości reakcji: kt = 0,085.10'3 [M'1 s'1] (dla hydrolizy) ik2 - 3,55.10~3 [M~1s~1] (dla reakcji redoks). Wyznaczone doświadczalnie wartości entalpii i entropii aktywacji dla reakcji hydrolizy są odpowiednio równe 23,89 [kj-mol1] i -152,9 [l-mol''-K'']. Te same parametry dla reakcji redoks wynoszą: 24,016 [kj-mol~'] i -166,6 [l-mol^-K1]. lako wynik analiz danych doświadczalnych sugeruje się również, że alkohol etylowy pełni rolę katalizatora w czasie hydrolizy [PtCIJ2'. lego obecność prowadzi do nieznacznego przyspieszenia tej reakcji oraz do powolnej redukcji Pt4+.

Słowa kluczowe

EN

kinetics; mechanism; redox reaction; platinum; ethanol; rate law

PL

kinetyka; mechanizm; reakcja redoks; platyna; etanol; szybkość reakcji

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Rudy i Metale Nieżelazne Recykling
• Rocznik: 2016
• Tom: R. 61, nr 8
• Strony: 337--343
• Opis fizyczny: Bibliogr. 26 poz., tab., rys.

Twórcy

autor

Pacławski K.

• AGH University if Science and Technology, Faculty of Non-Ferrous Metals, 30 Mickiewicz Avenue, 30-059 Kraków, Poland

autor

Karczewski K.

• GE Medical Healthcare IT CoE, Kraków, Poland

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