Studies on the complex formation equilibria in copper(II)- and nickel(II)-1,3-propanediamine-N,N′-diacetate-N,N′-di-3-propionate solutions

• Published in: Polyhedron Vol. 11; no. 2; pp. 197 - 204
• Main Authors: Djurdjevic, Predrag, Radanovic, Dusan J., Cvijovic, Milica, Dimitrijevic, Mihailo, Veselinovic, Dragan
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 1992; New York, NY Elsevier Science
• Subjects: Chemistry; Exact sciences and technology; Inorganic chemistry and origins of life; Kinetics and mechanism of reactions; Complexation; Diamine; Chemical equilibrium; Transition metal Ions; Photoelectron spectrum; Complexone; Carboxylate; Organic ligand; Copper Ions; Nickel Ions; Visible spectrum; Potentiometry
• ISSN: 0277-5387
• DOI: 10.1016/S0277-5387(00)83282-9

The complex formation between copper(II) and nickel(II) ions and the title ligand (abbreviated as 1,3-pddadp) was studied by emf glass electrode and spectrophotometric measurements in 0.5 M (Na)NO 3 medium at 25°C. Within the concentration limits 1.0⩽[M] o ⩽ 10.0, 2.0 ⩽ [L] o ⩽ 20.0 (mM) (M = Cu or Ni, L = 1,3-pddadp) and 2.0⩽ -Iog[H +] ⩽, 10.0, the experimental data were explained by the formation of the following complexes [CuH 2L] (log β 1,2,1 = 22.32 ± 0.04); [CuHL] + (log β 1,1,1 = 19.03±0.06); [CuL] 2− (log β 1,0,1 = 14.96±0.06); [Cu(OH)L] 3− (log β 1,-1,1 = 3.40±0.08); [Ni(HL] − (log β 1,1,1 = 17.65±0.03); [NiL] 2− (log β 1,0,1 = 14.25±0.03) and [Ni(OH)L] 3− (log β 1,-1,1 = 3.30 ± 0.08). The complexes Na 2[M(1,3-pddadp)] were synthesized and characterized by elemental analysis, visible and IR spectra. The structures of complexes are suggested.