کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
673959 | 1459536 | 2012 | 7 صفحه PDF | دانلود رایگان |
The mixed-ligand complex formation in the systems Hg2+ − Edta4− − L−(L = Arg, Orn, Ser) has been studied by means of calorimetry, pH-potentiometry and NMR spectroscopy in aqueous solution at 298.15 K and the ionic strength of I = 0.5 (KNO3). The thermodynamic parameters of formation of the HgEdtaL, HgEdtaHL and (HgEdta)2L complexes have been determined. The most probable coordination mode for the complexone and the amino acid in the mixed-ligand complexes was discussed.
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► Stable mixed ligand complexes of HgEdta with amino acids at physiological pH value.
► The thermodynamic and NMR data evident the ambidentate coordination mode of arginine.
► Participation of the guanidinic group of Arg in coordination process.
► Binuclear complexes (HgEdta)2L with the bridging function of amino acid.
Journal: Thermochimica Acta - Volume 548, 20 November 2012, Pages 38–44