SYNTHESIS AND CHARACTERIZATION OF A NEW QUINQUEDENTATE LIGAND CONSISTING OF SALEN SKELETON AND PHENOLIC TAIL CAPABLE OF AXIAL COORDINATION AND ITS METAL COMPLEXES.

Article abstract of DOI:10.1246/bcsj.56.3268

A new quinquedentate ligand N,N prime disalicylidene-2-methyl-4-(2-hydroxy-5-methylphenyl)-1,2-butanediami ne (H//2(sal-Hpen) has been prepared, which is a salen derivative containing a phenolic tail capable of axial coordination. It formed the complexes of a general formula left bracket M(sal-Hpen) right bracket with copper(II), nickel(II), and cobalt(II) ions. Based on infrared, electronic and ESR spectra, the complexes were revealed to assume a planar coordination, free from axial coordination of the phenolic tail. On the other hand, distorted octahedral cobalt(III) and tetragonal pyramidal iron(III) complexes, left bracket Co(sal-pen)py right bracket and left bracket Fe(sal-pen) right bracket , were obtained, where sal-pen**3** minus acts as a quinquedentate ligand.