Lanthanide complexes of D-penicillamine: formation constants,spectral and thermal properties |
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Abstract: | The complex-formation of lanthanide(III) elements with D-penicillamine have been investigated in acidic and neutral media. The macroscopic protonation constants of the ligand and the formation constants of Ln.Pen]+, Ln.Pen2]?, Ln.Pen.OH] and Ln.Pen.(OH)2]? complexes were determined from pH-metric data using the BEST computer program. Elemental analyses of the solid complexes indicate formation of 1?:?1 metal?:?ligand species. The binding sites in the complexes with the possible role of –COO?, –NH2 and –SH groups in the coordination have been discussed using infrared data. The complexes decompose in four steps as shown by their t.g. and d.t.a. analyses. A mechanism of decomposition is proposed which is supported by mass spectral data. |
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Keywords: | D-penicillamine Ln(III) Complexes Formation constants Spectral and thermal properties |
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