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

Copper(II) complexes with organic ligands. V. Formation of ethylenediaminecopper(II) complexes in the presence of salicylate ions

J. Krätsmár-Šmogrovič, V. Jokl, and M. Mělník

Department of Inorganic and Organic Chemistry, Faculty of Pharmacy, Komenský University, Bratislava

Abstract: From the preparative point of view, study of Cu(II) reactions with ethylenediamine in solutions in the presence of acid residues of calicylic acid resulted in the isolation of bis(ethylenediamine)copper(H)salicylate monohydrate and bis(salicylato) ethylenediaminecopper(II) complex, depending on the molecular ratio of the reactants. The former was also obtained by the heterogeneous reaction course of diaquobis(salicylato)copper(II) complex dihydrate, bis(salicylato)dipyridinecopper(II) complex and bis(salicylato)ethylenediaminecopper(H) complex, respectively, with ethylene diamine vapours (from 67% aqueous solution). Systems: copper(II) ions—salicylate ions—ethylenediamine (in excess) were investigated by electrophoresis and spectrophotometrically, and in the alkaline pH range, likewise in the aqueous solution of bis (ethylenediamine) copper (II) salicylate a bis(ethylenediamine)copper(II) ion was identified. It is to be assumed that even in the isolated bis (ethylenediamine) copper (II) salicylate monohydrate the salicylate ions do not participate in the process of formation of the inner sphere of Cu(II) atoms (limited by the usual coordination number 4). On the other hand, in systems with equimolecular ratio of Cu(II) and ethylenediamine (in the acidic pH range) the electrophoretic mobility of Cu(II) ions and its light absorption in the visible part of spectrum are substantially influenced in the presence of salicylate ions. Under the above mentioned reaction conditions it shows an interaction of both ligands with Cu(II) at the same time and it also supports the concept of heterogeneous inner shell in the isolated bis(salicylato)ethylenediaminecopper(II) complex

Full paper in Portable Document Format: 219a676.pdf (in Slovak)

Chemical Papers 21 (9) 676–686 (1967)