Complexation of 1,3-Bis(tris(hydroxymethyl)methylamino)propane Systems Involving Divalent (Cobalt, Nickel, or Zinc) Ions in Aqueous Solution by Potentiometry

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Laureys, T (Author) Other; Pinto, ISS (Author) Other; Soares, CVM (Author) Other; Boppudi, HB (Author) Other; Helena Soares (Author) FEUP

Journal

Title: Journal of Chemical & Engineering Data

Vol. 57 No. 8

Pages: 87-92

ISSN: 0021-9568

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 6 Citations

ISI Web of Science

Scopus - 6 Citations

Scientific classification

FOS: Natural sciences

CORDIS: Technological sciences

Other information

Authenticus ID: P-002-HDW

DOI: 10.1021/je200809m

Abstract (EN): Protonation constants of 1,3-bis(tris(hydroxymethyl)methylamino)propane (BTP) and the complexes formed between BTP and Co(II), Ni(II), or Zn(II) metal ions have been studied by glass electrode potentiometry (GEP) in aqueous 0.1 mol.L(-1) KNO(3) supporting electrolyte at 25 +/- 0.1 degrees C. The complexation model for each M(II)-BTP system was established. The proposed final model for Ni(II)-BTP system is: NiL, NiLH(-1), and NiLH(-2), with stability constant values, as log beta, of 7.13 +/- 0.02, -1.32 +/- 0.04, and -10.81 +/- 0.05, respectively. For Co(II)-BTP and Zn(II)-BTP systems, the proposed final model is constituted by ML, ML(2), ML(2)H(-1), and ML(2)H(-2) complexes. For the Co(II)-BTP system, the overall refined stability constants (as log beta) are 4.57 +/- 0.02, 8.76 +/- 0.02, 0.17 +/- 0.03, and -8.73 +/- 0.03, respectively, and for Zn(II)-BTP system they are 4.99 +/- 0.02, 9.18 +/- 0.03, 1.01 +/- 0.03, and -7.91 +/- 0.04, respectively. In a general way, the complex stability was found to follow the trend: Ni(II) > Zn(II) > Co(II).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6