Please use this identifier to cite or link to this item:
Title: Complexation and molecular modeling studies of europium(III)-gallic acid-amino acid complexes
Author: Taha, Mohamed
Khan, Imran
Coutinho, João A.P.
Keywords: Eu(III) complexes
Gallic acid
Amino acids
Stability constants
Issue Date: Apr-2016
Publisher: Elsevier
Abstract: With many metal-based drugs extensively used today in the treatment of cancer, attention has focused on the development of new coordination compounds with antitumor activity with europium(III) complexes recently introduced as novel anticancer drugs. The aim of this work is to design new Eu(III) complexes with gallic acid, an antioxida'nt phenolic compound. Gallic acid was chosen because it shows anticancer activity without harming health cells. As antioxidant, it helps to protect human cells against oxidative damage that implicated in DNA damage, cancer, and accelerated cell aging. In this work, the formation of binary and ternary complexes of Eu(III) with gallic acid, primary ligand, and amino acids alanine, leucine, isoleucine, and tryptophan was studied by glass electrode potentiometry in aqueous solution containing 0.1 M NaNO3 at (298.2 ± 0.1) K. Their overall stability constants were evaluated and the concentration distributions of the complex species in solution were calculated. The protonation constants of gallic acid and amino acids were also determined at our experimental conditions and compared with those predicted by using conductor-like screening model for realistic solvation (COSMO-RS) model. The geometries of Eu(III)–gallic acid complexes were characterized by the density functional theory (DFT). The spectroscopic UV–visible and photoluminescence measurements are carried out to confirm the formation of Eu(III)–gallic acid complexes in aqueous solutions.
Peer review: yes
DOI: 10.1016/j.jinorgbio.2016.01.017
ISSN: 0162-0134
Appears in Collections:CICECO - Artigos

Formato BibTex MendeleyEndnote Degois 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.