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Three new vic-dioxime ligands, [N-(ethyl-4-amino-1-piperidine carboxylate)-phenylglyoxime (L 1 H 2 ), N-(ethyl-4-amino-1-piperidine carboxylate)-glyoxime (L 2 H 2 ), and N,N¢-bis(ethyl-4-amino-1-piperidine carboxylate)-glyoxime (L 3 H 2 )], and their Co(II) with Cu(II) metal complexes, were synthesized for the first time. Mononuclear complexes of these ligands with a 1:2 metal-ligand ratio were prepared with Co(II) and Cu(II) salts. The BF 2 + -capped Co(II) and mononuclear complexes of the vic-dioxime were prepared for [Co(L 1 AE BF 2 ) 2 ] and [Co(L 2 AE BF 2 ) 2 ]. The ligands act in a polydentate fashion bonding through nitrogen atoms in the presence of a base, as do most vic-dioximes. The cobalt(II) and copper(II) complexes are non-electrolytes as shown by their molar conductivities (L M ) in DMF. The structures of the ligands and complexes were determined by elemental analyses, FT-i.r., u.v.-vis., 1 H-and 13 C-n.m.r. spectra, magnetic susceptibility measurements, and molar conductivity. The comparative electrochemical studies show that the stabilities of the reduced or oxidized species and the electrode potentials of the complexes are affected by the substituents attached on the oxime moieties of the complexes.

Six new macrocyclic complexes were synthesized by reaction of 1,4-bis(2-carboxyaldehyde phenoxy)butane with various diamines. Then, their nickel(II) perchlorate complexes were synthesized by the template effect by reaction of 1,4-bis(2-carboxyaldehyde phenoxy)butane, Ni(ClO 4 ) 2 AE 6H 2 O and various diamines. The metal-to-ligand ratio of Ni II metal complexes was found to be 1:1. The compounds are coordinated to the central metal as tetradentate O 2 N 2 ligands The Ni II complexes are proposed to exhibit tetrahedral geometry. Ni II metal complexes are 1:2 electrolytes as shown by their molar conductivities (K M ) in DMF (dimethyl formamide) at 10 )3 M. The structure of Ni II metal complexes is proposed from elemental analysis, f.t.-i.r., u.v.-vis., magnetic susceptibility measurements, molar conductivity measurements and mass spectra.

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