Synthesis, X-ray crystal structure, and electrochemistry of copper(II) complexes of a new tridentate unsymmetrical Schiff base ligand and its hydrolytically rearranged isomer
Artikel i vetenskaplig tidskrift, 2012

A new unsymmetrical Schiff base ligand HL1, HBacabza, and its copper(II) complexes [Cu2L21(OAc)(2)] (1) and [Cu2L22(N-3)(2)]center dot 2H(2)O (2) with HBacabza = 3-(2- aminobenzylimino)-1-phenylbutan-1-one as HL1 and its hydrolytically rearranged isomer 3-(2-aminomethylphenyleneimino)-1-phenylbutan-1-one as HL2, have been synthesized and characterized by elemental analyses and spectroscopic methods. The rearrangement of HL1 to HL2 occurs in a hydrolysis-recondensation process in the reaction of HL1 with Cu(ClO4)(2)center dot 6H(2)O and NaN3. The crystal structures of the ligand and its complexes have been determined by single crystal X-ray diffraction. The deprotonated Bacabza coordinates to the metal center as a tridentate ligand. The acetate anion coordinates through one oxygen atom in complex 1 leading to a mono-atomic acetate oxygen-bridging dimeric copper(II) complex. Similarly, the azide anion coordinates through one nitrogen atom in complex 2 leading to a mono-atomic azide nitrogen-bridging dimeric copper(II) complex. The copper(II) ions adopt a distorted square pyramidal (4 + 1) coordination in these two complexes. The cyclic voltammetric studies of these complexes in N, N-dimethylformamide indicate that the reduction process corresponding to Cu-II/Cu-I is electrochemically irreversible in complex 1, presumably due to the structural changes during the course of redox reaction, and quasi-reversible in complex 2.





coordination polymer



dinuclear copper(ii)

cyclic voltammetry

Unsymmetrical Schiff base

catalyzed hydrolysis

cobalt(iii) complexes

nickel(ii) complexes


1st evidence

crystal structure

cu(ii) complexes


S. Meghdadi

Isfahan University of Technology

K. Mereiter

Technische Universität Wien

Vratislav Langer

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Ahmad Amiri

Isfahan University of Technology

R. S. Erami

Isfahan University of Technology

Al-Shimaà A A Massoud

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Mehdi Amirnasr

Isfahan University of Technology

Inorganica Chimica Acta

0020-1693 (ISSN)

Vol. 385 31-38