کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1311133 | 975284 | 2011 | 6 صفحه PDF | دانلود رایگان |
The mixed-ligand complex formation in the systems Hg2+–Edta4−–L (L = Cys2−, Met−) 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 is discussed.
The bridge function of amino acids in binuclear complexes of the type (HgEdta)2L (L = Cys, Met) has been investigated by means of calorimetry, pH-potentiometry and NMR spectroscopy. The received data evident the participation of S-CH3 group of Met in coordination process and its ambidentate character in mixed complex.Figure optionsDownload as PowerPoint slideHighlights
► The unusual bridge function of amino acids in binuclear complexes of the type (HgEdta)2L (L = Cys, Met) has been investigated.
► The thermodynamic and NMR data evident the participation of S-CH3 group of Met in coordination process.
► The amino acid can be monodentate in the mononuclear mixed complex or bidentate with the bridging function in the binuclear complex.
Journal: Inorganica Chimica Acta - Volume 371, Issue 1, 31 May 2011, Pages 53–58