ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7

Published monthly
 

Synthesis, characterization, fluorescence and redox features of new vic -dioxime ligand bearing pyrene and its metal complexes

Ismail Yilmaz, Ahmet Kilic, and Hacer Yalcinkaya

Department of Chemistry, Technical University of Istanbul, 34469 Istanbul, Turkey

 

E-mail: iyilmaz@itu.edu.tr

Received: 24 November 2007  Revised: 14 January 2008  Accepted: 16 January 2008

Abstract: A new vic-dioxime ligand, N,N′-bis(aminopyreneglyoxime) (LH2), and its copper(II), nickel(II) and cobalt(II) metal complexes were synthesized and characterized by elemental analyses, IR, UVVIS and 1H and 13C NMR spectra (for the ligand). Mononuclear complexes were synthesized by a reaction of ligand (LH2) and salts of Co(II), Ni(II), and Cu(II) in ethanol. The complexes have the metal-ligand ratio of 1: 2 and metals are coordinated by N,N′ atoms of vicinal dioximes. The ligand acts in a polydentate fashion bending through nitrogen atoms in the presence of a base, as do most vic-dioximes. Detection of a H-bonding in the Co(II), Ni(II), and Cu(II) complexes by IR revealed the square-planar MN4 coordination of mononuclear complexes. Fluorescent properties of the ligand and its complexes arise from pyrene units conjugated with a vic-dioxime moiety. Fluorescence emission spectra of the ligand showed a drastic decrease in its fluorescence intensity upon metal binding. The electrochemical properties of the complexes were studied by the cyclic voltammetry technique. The nickel complex displayed an irreversible oxidation process while the copper complex exhibited a quasi-reversible oxidation and reduction processes based on the copper Cu(II)/Cu(III) and Cu(II)/Cu(I) couples, respectively.

Keywords: vic-dioxime ligand -  N,N′-bis(aminopyreneglyoxime) - fluorescence properties - electrochemistry - Co(II) - Ni(II) - and Cu(II) complexes

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-008-0046-7

 

Chemical Papers 62 (4) 398–403 (2008)

Friday, December 06, 2019

IMPACT FACTOR 2018
1.246
SCImago Journal Rank 2018
0.274
SEARCH
Advanced
VOLUMES
International Conference on Coordination and Bioinorganic Chemistry
46th International Conference of SSCHE
© 2019 Chemical Papers