Kinetics of hydrolysis of amino acid esters in presence of aquocomplexes involving ethylenediamine,diethylenetriamine and triethylenetetramine ligands. Part 1-copper(II) and nickel(II) |
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Authors: | H. Chakraborty M. L. Rahman |
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Affiliation: | (1) Department of Chemistry, Rajshahi University, 6205 Rajshahi, Bangladesh |
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Abstract: | Summary Aquocomplexes of copper(II) and nickel(II) involving (H2NCH2)2, H2NCH2CH2NHCH2CH2NH2 and H2NCH2CH2NHCH2CH2NHCH2CH2NH2 as ligands were prepared and characterised. Using a pH-stat method, the kinetics of the base hydrolysis of amino acid esters such as H2NCH2CO2CH3·HCl (GE), (HO)C6H4CH2-(NH2)CO2CH3·HCl (TE), CH3S(CH2)2CH(NH2)CO2CH3· HCl (ME), HSCH2CH(NH2)CO2C2H5·HCl (CE), (HE) and [—SCH2CH(NH2)CO2CH3]2·2HCl (CysE) was studied. These complexes substantially enhance the rate of hydrolysis, the values of the second-order rate constants being some 10–30 times greater than those obtained in the presence of simple metal ions. |
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