PROMOTED HYDROLYSIS OF SOME ORGANOPHOSPHATE ESTERS USING SUPPORTED [Cu(tmen)OH(OH2)]+

Year 2017, Volume: 18 Issue: 3, 720 - 732, 30.09.2017

Murat Erdem

https://doi.org/10.18038/aubtda.318087

Abstract

In
this study, tetramethylethylenedimine copper(II) complex (Cu(tmen)Cl₂)
was synthesized and natural clay smectite and synthetic Dowex-50WX8
resin containing Cu(tmen)(OH)(OH₂)⁺
were prepared via ion exchange process in aqueous solution. Dowex- and smectite-supported
Cu(tmen)(OH)(OH₂)⁺ were used as a promoter in the
hydrolysis reactions of organophosphate compounds of diethyl-p-nitrophenyl
phosphate and p-nitrophenyl diphenyl phosphate at different pH values. Scanning electron microscope attached
with energy dispersive X-ray dedector and surface area analyzer were used for
the characterization of the promoters. The efficiency of these promoters was
evaluated in accordance with pseudo-first-order and Michaelis-Menten enzyme
kinetic models. The amount of copper(II) complex in Dowex-supported promoter was
higher than that of smectite-supported one (1.36 mmol/g and 0.88 mmol/g, respectively) and the higher efficiency was
obtained when Dowex-supported promoter was employed in all of the hydrolysis
reactions. 222 and 114-fold increasing in pseudo-first-order rate constants
compared to the reactions without promoter were observed for the hydrolysis of diethyl-p-nitrophenyl
phosphate at pH 8.0 in the presence of Dowex-supported and smectite-supported promoters.

Keywords

Dowex-50WX8, Smectite, Tetramethylethylenedimine copper(II) complex, Diethyl-p-nitrophenyl phosphate

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