Synthesis and complexation of a novel soluble vic-dioxime with hydroxyethyl pendant arms

• Published in: Transition metal chemistry (Weinheim) 2000-08, Vol.25 (4), p.474
• Main Authors: Gürsoy, Süleyman, Koçak, Makbule, Cihan, Ali, Gül, Ahmet, Bekarolu, Özer
• Format: Article
• Language: English
• ISSN: 0340-4285; 1572-901X
• DOI: 10.1023/A:1007028905198

A new soluble vic-dioxime ligand namely 1,4-bis(2'-hydroxyethyl)-2,3-bis(hydroxyimino)-5,6-diphenylpiperazine, (LH^sub 2^) containing optically active centers has been prepared as a mixture of isomers from (CNO)^sub 2^ and N,N-bis(2-hydroxyethyl)stilbendiamine (1) which has been made by the reduction of the condensation of the product of benzaldehyde and 2-aminoethanol in the presence of aluminum amalgam. N,N-coordinated planar metal complexes of this ligand have been synthesized with Ni^sup II^, Cu^sup II^, Co^sup II^, Pd^sup II^ and U^sup VI^O^sub 2^. Oxidation of (LH)^sub 2^Co in the presence of a base, such as pyridine, leads to an octahedral complex (LH)^sub 2^CopyCl containing pyridine and chloride as axial ligands in addition to vic-dioxime ligands. The structures of the ligand and its complexes are proposed on the basis of elemental analysis, ^sup 1^H-n.m.r., mass, i.r. and u.v.-vis. spectral data.[PUBLICATION ABSTRACT]