کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1340377 | 979732 | 2008 | 7 صفحه PDF | دانلود رایگان |
Equilibrium studies on the nickel(II) complexes of oxygen and nitrogen donor ligand (monophosphono dipeptides: 1- (N-l-leucylamino)methylphosphonic acid – Leu-Gly(P), and a thioether sulfur donor ligands (monophosphono dipeptides: 1-N-(glycyloamino)-2-(S-benzylthio)ethanephosphonic acid – Gly-(Bz)Cys(P), d(−) and Gly-(Bz)Cys(P), d(+) were performed by potentiometric titration and NIR–Vis spectroscopy. Additionally, the ligand-field parameters (CFM/AOM) were estimated and discussed in the tetragonal distortion framework. The lowest tetragonal distortion was observed in the case of the [NiHL] species, whereas the strongest in the case of [NiL2] species. In the latter species the ligand-field analysis confirms the coordination of the deprotonated phosphonic groups to the metal ions in both axial positions. In the case of nickel(II) complexes with Gly-(Bz)Cys(P), d(−) or Gly-(Bz)Cys(P), d(+) additional interaction between sulfur donor atom and nickel(II) was suggested.
Equilibrium studies on the nickel(II) complexes of some monophosphono dipeptides were performed by potentiometric titration and NIR–Vis spectroscopy. The ligand-field parameters (CFM/AOM) were estimated and discussed. The lowest tetragonal distortion was observed in the case of the [NiHL] species, whereas the strongest in the [NiL2] species. In nickel(II) complexes with Gly-(Bz)Cys(P) additional interaction between sulfur and nickel(II) was suggested.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 27, Issue 13, 10 September 2008, Pages 3053–3059