Kinetics and Mechanism of Metal cation Catalysis in the Hydrolysis of p-Nitrophenyl Picolinate (PNPP)

• Autorzy: Cheng S.
• Języki publikacji: EN

Abstrakty

EN

The hydrolysis of PNPP was investigated in the presence and absence of Co(II), Cu(II), Ni(II), Zn(II), La(III) at 25°C and ionic strength of 0.1 mol dm-3. The results indicate that the spontaneous hydrolysis of PNPP was catalyzed by hydronium ion, hydroxide ion and water molecule, because of the existence of the pyridium nitrogen, while the metal ion catalyzed hydrolysis of PNPP at zero buffer concentration fulfills the equation: k obsd=K a [H+]+K a (k H[H+]+k 0+k OH K W [H+] showing that the reaction proceeds via nucleophilic attack by external OH- on the metal ion complex of PNPP. The order of catalytic ability of different metal ions was interpreted by the stability of the complex structure relative to the structure of the groundstate intermediate, employing the method devised by Kurz for catalyzed reaction.

Słowa kluczowe

EN

metal ion; catalysis; PNPP; kinetics and mechanism

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2005
• Tom: Vol. 79 / nr 5
• Strony: 933--939
• Opis fizyczny: Bibliogr. 20 poz., rys.

Twórcy

autor

Cheng S.

• Department of Biotechnology and Chemical Engineering, Wuhan Polytechnic University, Hankou Changqing Garden 1#, Wuhan 430023, Hubei, P. R. China

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