کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1313249 975542 2005 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Catalytic effect of a dinuclear [Fe2III(OH)(OH2)] complex in the hydrolysis of bis(2,4-dinitrophenyl) phosphate
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Catalytic effect of a dinuclear [Fe2III(OH)(OH2)] complex in the hydrolysis of bis(2,4-dinitrophenyl) phosphate
چکیده انگلیسی

The kinetics of the hydrolysis of bis(2,4-dinitrophenyl) phosphate (BDNPP) has been studied in the presence of a dinuclear Fe(III) complex that acts as a catalyst in the hydrolytic reaction. One equivalent of the 2,4-dinitrophenolate ion (DNP) and one equivalent of 2,4-dinitrophenylphosphate (DNPP) were liberated for each equivalent of BDNPP, and the reaction showed first-order kinetics in relation to both BDNPP and the metal ion complex. Potentiometric titrations of the dinuclear complex are consistent with two deprotonation constants of the metal coordinated water molecules, with pKa values of 4.88 and 6.33 and the reactions show a pH dependence which is consistent with a Fe2(OH)(OH2) form as the reactive species during the hydrolytic reaction. The kinetics of the reaction show an inverse solvent isotope effect of 0.44, which is consistent with a pre-equilibrium proton transfer before the hydrolysis reaction of the BDNPP.

Equilibrium and detailed kinetic studies of a dinuclear iron(III) complex demonstrate that Fe2III(OH)(OH2) is the reactive species during the hydrolytic reaction of bis(2,4-dinitrophenyl) phosphate (2,4-BDNPP) through intramolecular OH− attack.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Inorganica Chimica Acta - Volume 358, Issue 6, 30 March 2005, Pages 2089–2092
نویسندگان
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