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Stabilities and coordination modes of glycinephosphonic acid in copper(II) heteroligand complexes with ethylenediamine, diethylenetriamine or N, N, N′, N′, N″-pentamethyldiethylene triamine in aqueous solution.
- Source :
- Structural Chemistry; Apr2010, Vol. 21 Issue 2, p347-355, 9p, 1 Diagram, 2 Charts, 3 Graphs
- Publication Year :
- 2010
-
Abstract
- Solution equilibrium studies on the Cu(II)-polyamine-(aminomethyl)phosphonic acid (glycinephosphonic acid) ternary systems (polyamine: ethylenediamine (en), diethylenetriamine (dien), N, N, N′, N′, N″-pentamethyldiethylenetriamine (Me<subscript>5</subscript>dien)) have been performed by pH-potentiometry, UV–vis spectrophotometry and EPR methods. The obtained results suggest the formation of the heteroligand complexes with [Cu(A)(Gly(P))] stoichiometry in all studied systems. Additionally, in the systems with dien the protonated [Cu(dien)(H–Gly(P))]<superscript>+</superscript> species also exists in acid solution and in the system with en the [Cu(en)(Gly(P))H<subscript>-1</subscript>]<superscript>−</superscript> species is formed in the basic solution. Our spectroscopic results indicate the tetragonal geometry for the [Cu(en)(Gly(P))] species, the geometry slightly deviated from square pyramidal for the [Cu(dien)(Gly(P))] complex and strongly deviated from square pyramidal towards trigonal bipyramidal for the [Cu(Me<subscript>5</subscript>dien)(Gly(P))] species. The coordination modes in these heteroligand complexes are discussed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10400400
- Volume :
- 21
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Structural Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 50110685
- Full Text :
- https://doi.org/10.1007/s11224-009-9534-9