Complexation studies of N,N´-ethylenedi-L-cysteine with some metal ions

• Type: Article in International Scientific Journal
• Date: 2009

Authors

M. Teresa Barros (Author) Other; João Martins (Author) Other; Rui M. Pinto (Author) Other; Mónica S. Santos (Author) FEUP; Helena M. V. M. Soares (Author) FEUP

Journal

Title: Journal of Solution Chemistry

Vol. 38 No. 12

Pages: 1504-1519

ISSN: 0095-9782

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 4 Citations

ISI Web of Science

Scopus - 4 Citations

Scientific classification

FOS: Natural sciences

CORDIS: Natural sciences

Other information

Authenticus ID: P-003-E35

DOI: 10.1007/s10953-009-9463-7

Abstract (EN): As part of a search for environmentally friendly metal chelating ligands, the stability constants of N,¿N¿-ethylenedi-L-cysteine (EC) complexes with Ca(II), Cu(II), Mg(II) and Mn(II) were determined by potentiometry with a glass electrode in aqueous solutions containing 0.1 mol¿L¿1 KCl at 25¿°C. Final models are proposed. For the Ca(II)¿EC system, the overall stability constants are log¿10 ß CaHL=14.53±0.03, log¿10 ß CaL=4.79±0.01 and log¿10 ß CaL2=8.38±0.04. For the M(II)¿EC systems, where M=Cu(II) or Mg(II), the overall stability constants are log10 ß CuHL=31.19±0.02 and log¿10 ß CuL=27.02±0.06 for Cu(II), and are log¿10 ß MgHL=14.84±0.02 and log¿10 ß MgL=6.164±0.008 for Mg(II). For the Mn(II)¿EC system, the overall stability constant is log¿10 ß MnL=10.12±0.01. Metal¿chelate speciations simulations showed that EC is an efficient chelating agent for Cd(II), Co(II), Cu(II), Ni(II), Pb(II) and Zn(II) for pH¿7.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16