Preparation, Spectral Properties and Biological Activity of Cu(II), Zn(II) and Cd(II) Chelates of 8-Hydroxyquinoline-5-suIfonamides

The com plexes of some quinolinol sulfonamides with Cu(II), Z n(II), and Cd(II) have been synthesized and formulated as [Cu(L)2(H 20 ) 2] and [M (L)2]rcH20 , M = Zn(II), or Cd(II), n = 0 —3 and L = anion of the corresponding ligand. Their structures have been suggested by elem en­ tal analysis, electronic and IR spectroscopy, and conductivity measurements. It was found that the sulfonamide ligands are monobasic bidentate ON donors of the quinolinol group. Consequently, the Zn(II) and Cd(II) com plexes are formulated as tetrahedral, whereas in Cu(II) com plexes a distorted octahedral environment of the metal ion is proposed. It was proven that the metal chelates inhibit and actively affect the germination of wheat seed.