Kinetic studies in aqueous solutions of iron(II)-glycinate, -ethylenediamine, and -malonate complexes

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The kinetic properties of the complexes formed in aqueous solutions of the Fe2+-glycinate (glyO), -ethylenediamine (en) and -malonate (mal) systems have been investigated by measuring the paramagnetic relaxation rate and shift of the CH2 protons of the ligands over a wide range of complex formation. The formation rate constants (kf) of the parent complexes are as follows: glycinate, k1 = 5.4 × 106, k2 = 5.0 × 106, and k3 = 1.9 × 106; ethylenediamine, k1 = 7.1 × 107, k2 = 1.8 × 107, and k3 = 2.1 × 106; malonate, k1 = 6.8 × 107 and k2 = 1.3 × 107 dm3 mol-1 s-1. Kinetic evidence for the formation of [Fe(gly)]2+, [Fe(Hen)]3+, and [Fe(Hmal)]+ complexes is provided. A 'carboxyl-displacement' mechanism is suggested for the interaction between [Fe(glyO)3]- and free glyO- ligand.

Original languageEnglish
Pages (from-to)743-747
Number of pages5
JournalJournal of the Chemical Society, Dalton Transactions
Issue number3
DOIs
Publication statusPublished - 1990

Fingerprint

ethylenediamine
Iron
Ligands
Kinetics
Protons
Rate constants
malonic acid

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

@article{ded5e6c61c7b4a0b8b49b145b1ce3572,
title = "Kinetic studies in aqueous solutions of iron(II)-glycinate, -ethylenediamine, and -malonate complexes",
abstract = "The kinetic properties of the complexes formed in aqueous solutions of the Fe2+-glycinate (glyO), -ethylenediamine (en) and -malonate (mal) systems have been investigated by measuring the paramagnetic relaxation rate and shift of the CH2 protons of the ligands over a wide range of complex formation. The formation rate constants (kf) of the parent complexes are as follows: glycinate, k1 = 5.4 × 106, k2 = 5.0 × 106, and k3 = 1.9 × 106; ethylenediamine, k1 = 7.1 × 107, k2 = 1.8 × 107, and k3 = 2.1 × 106; malonate, k1 = 6.8 × 107 and k2 = 1.3 × 107 dm3 mol-1 s-1. Kinetic evidence for the formation of [Fe(gly)]2+, [Fe(Hen)]3+, and [Fe(Hmal)]+ complexes is provided. A 'carboxyl-displacement' mechanism is suggested for the interaction between [Fe(glyO)3]- and free glyO- ligand.",
author = "K. Micskei and I. Nagyp{\'a}l",
year = "1990",
doi = "10.1039/DT9900000743",
language = "English",
pages = "743--747",
journal = "Dalton Transactions",
issn = "1472-7773",
publisher = "Royal Society of Chemistry",
number = "3",

}

TY - JOUR

T1 - Kinetic studies in aqueous solutions of iron(II)-glycinate, -ethylenediamine, and -malonate complexes

AU - Micskei, K.

AU - Nagypál, I.

PY - 1990

Y1 - 1990

N2 - The kinetic properties of the complexes formed in aqueous solutions of the Fe2+-glycinate (glyO), -ethylenediamine (en) and -malonate (mal) systems have been investigated by measuring the paramagnetic relaxation rate and shift of the CH2 protons of the ligands over a wide range of complex formation. The formation rate constants (kf) of the parent complexes are as follows: glycinate, k1 = 5.4 × 106, k2 = 5.0 × 106, and k3 = 1.9 × 106; ethylenediamine, k1 = 7.1 × 107, k2 = 1.8 × 107, and k3 = 2.1 × 106; malonate, k1 = 6.8 × 107 and k2 = 1.3 × 107 dm3 mol-1 s-1. Kinetic evidence for the formation of [Fe(gly)]2+, [Fe(Hen)]3+, and [Fe(Hmal)]+ complexes is provided. A 'carboxyl-displacement' mechanism is suggested for the interaction between [Fe(glyO)3]- and free glyO- ligand.

AB - The kinetic properties of the complexes formed in aqueous solutions of the Fe2+-glycinate (glyO), -ethylenediamine (en) and -malonate (mal) systems have been investigated by measuring the paramagnetic relaxation rate and shift of the CH2 protons of the ligands over a wide range of complex formation. The formation rate constants (kf) of the parent complexes are as follows: glycinate, k1 = 5.4 × 106, k2 = 5.0 × 106, and k3 = 1.9 × 106; ethylenediamine, k1 = 7.1 × 107, k2 = 1.8 × 107, and k3 = 2.1 × 106; malonate, k1 = 6.8 × 107 and k2 = 1.3 × 107 dm3 mol-1 s-1. Kinetic evidence for the formation of [Fe(gly)]2+, [Fe(Hen)]3+, and [Fe(Hmal)]+ complexes is provided. A 'carboxyl-displacement' mechanism is suggested for the interaction between [Fe(glyO)3]- and free glyO- ligand.

UR - http://www.scopus.com/inward/record.url?scp=37049077900&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=37049077900&partnerID=8YFLogxK

U2 - 10.1039/DT9900000743

DO - 10.1039/DT9900000743

M3 - Article

AN - SCOPUS:37049077900

SP - 743

EP - 747

JO - Dalton Transactions

JF - Dalton Transactions

SN - 1472-7773

IS - 3

ER -