ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Copper complexes with organic ligands. I. Chemistry of salicylatocopper(II) complexes

J. Krätsmár-Šmogrovič and V. Jokl

Komenský University, Bratislava

Abstract: The interaction of Cu²⁺ and C₆H₄(OH)CO^2- in aq. solns. to form ([Cu(Sal)₂(H₂O)₂].2H₂O) (I) (HSal is salicylic acid) was described. At pH 4.0 in the system Cu²⁺ - Sal^- - H₂O, I is crystd., if Cu²⁺:Sal^- is in the equiv. 1:2 or equimolar 1:1 ratio. The molar concns. of satd. aq. solns. of I are 2.46 × 10^-2 at 20°, 3.33 × 10^-2 at 30°, 4.69 × 10^-2 at 40°, and 6.82 × 10^-2 at 50°. I loses the bound H₂O at room temp., if the H₂O vapor pressure over the crystals is ≤1.3 mm. Complete dehydration is at 85-90° and is reversible. By spectrophotometric and paper-electrophoretic methods, it was detd. that at pH 2-6 and a component ratio of 1:1, this Cu(II) complex is formed in 2 steps: Cu²⁺ + Sal^- ↹ [Cu(Sal)]⁺; [Cu(Sal)]⁺ + Sal- ↹ [Cu(Sal)₂]. At pH 6-7, a chelate is formed: [Cu(Sal)]⁺ + H₂O ↹ [Cu(C₆H₄OCO₂)] + H₃O⁺.

Full paper in Portable Document Format: 1912a881.pdf (in Slovak)

Chemical Papers 19 (12) 881–891 (1965)