Komplexchemisches Verhalten von N‐substituierten 2‐(oHydroxyphenyl)‐Δ²‐imidazolinen als Metallextraktionsmittel

Abstract

The Coordinative Behaviour of N‐Substituted 2‐(Δ2‐Imidazolin‐2‐yl)‐phenols as Metal Extractants N‐Substituted 2‐(Δ2‐imidazolin‐2‐yl)‐phenols (R4NNOH) are obtained by the reaction of N‐alkyl diaminoethane‐1, 2 and 2‐hydroxybenzoic acid esters. In contrast to many other copper(II) complexes with the donor set N2O22−(A), the species Cu(R4NNO)2(B) are easily soluble in nonpolar solvents. The reason is the monomeric square‐planar structure of B, which differs from the polymeric distorted octahedral structure of A. The two maxima in the vis‐spectra of Cu(R4NNO)2 and Ni(R4NNO)2 are assigned to the 3 dxy → 3 dx2‐y2 and the 3 dxz, 3 dyz → 3 dx2‐y2 electron transitions. The shift of these maxima, which is connected with the dissolution in chloroform, is explained by the formation of hydrogen bonds between the solvent and the N‐alkylated nitrogen atoms of the ligands. 1H‐n. m. r.‐spectra and solubility of the ligands and the crystal structure of Cu[(C4H9)NNO]2 are described.