Novel Polydentate Phosphonic Acids: Protonation and Stability Constants of Complexes with Fe(III) and Cu(II) in Aqueous Medium

被引：11

作者：

Aliouane, Nabila ^{[2
]}

Chafaa, Salah ^{[2
]}

Douadi, Tahar ^{[2
]}

Helesbeux, Jean-Jacques ^{[1
]}

Khan, Mustayeen A. ^{[1
]}

Duval, Olivier ^{[1
]}

Bouet, Gilles ^{[1
]}

机构：

[1] UFR Sci Pharmaceut & Ingn Sante, IFR QUASAV 149, UPRES EA 921, Lab SONAS, F-49045 Angers 01, France

[2] Univ Ferhat Abbas, Fac Sci Ingenieur, LEMMC, DZ-19000 Setif, Algeria

来源：

HETEROATOM CHEMISTRY | 2010年 / 21卷 / 02期

关键词：

MONO-METHYLENEPHOSPHONIC ACIDS; (O-HYDROXYPHENYL)METHYLPHOSPHONIC ACIDS; CRYSTAL-STRUCTURE; CHELATING-AGENTS; COPPER(II); CHEMISTRY; NICKEL(II); COBALT(II); CORROSION; LIGANDS;

D O I：

10.1002/hc.20575

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The acido-basic and the complexation properties of di-, tri-, and tetra-phosphonic acids (H(6)L1, H(8)L2, and H(10)L3) toward Fe(III) and Cu(II) were determined by potentiometric titration in aqueous media at 25.0 +/- 0.1 degrees C with constant ionic strength (0.1 M, NaClO4). We have determined six, ten, and eight pK(a) values for the di, tri, and tetra-phosphonic acids, respectively. In acidic conditions, e.g., 0 <= pH <= 5; iron and copper presented a high affinity toward these ligands to give complex species. With the ligand H(10)L3, [FeL3H(7)], and [CuL3H(6)](2-) were easily obtained at pH 1.8 and 2.7, respectively. We have determined ten stability constants for the H(10)L3/Fe system and nine for the H(10)L3/Cu one; six and four in the cases of H(8)L2/Fe and H(8)L2/Cu systems, respectively. Finally, five stability constants were calculated for the H(6)L1/Fe system and four for the H(6)L1/Cu one. We have not observed any insoluble species in these complexes in acidic medium as well as in alkaline solutions. (C) 2010 Wiley Periodicals, Inc. Heteroatom Chem 21:51-62, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20575

引用

页码：51 / 62

页数：12

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