Chemija / Chemistry
 ISSN 0235-7216 ISSN 2424-4538 (online) |
2011 m. Nr. 2 Cu(II) complex formation with pentaethylenehexamine: determination of stability constants by the ligand displacement method
Cu(II) ions form 1 : 1 and 1 : 2 complexes with pentaethylenehexamine (penta) (pH 7), depending on penta excess. The spectrophotometric method of ligand displacement was applied for determining the stability constant of these complexes, using EDTA as a competitive ligand. The results are in agreement with the 1 : 1 and
1 : 2 stoichiometry of the complexes, namely Cupenta2+ and Cupenta2 2+, the stability constant logarithms being 21.3 and 29.5, respectively. The latter complex is one of the most stable known copper(II) complexes. Keywords: pentaethylenehexamine, copper(II), complex formation, stability constant |
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