Studies on Biologically Significant Copper (II) / Manganese (II) / Uranyl (II) – Isoleucine Binary Complexes
Brij Bhushan Tewari
Department of Chemistry, Faculty of Natural Sciences, University of Guyana, P. O. Box: 101110, Georgetown, Guyana. Tel: 592–222–6004, Fax: 592–222–3596. *Responsible author: brijtew@yahoo.com
Recibido el Febrero 18, 2008
Aceptado el Agosto 19, 2008
Abstract
The stability constants of Cu2+, Mn2+ and UO22+ complexes with isoleucine were determined by paper electrophoretic technique. Present method is based upon the migration of a spot of the metal ions on a paper strip at different pH's of background electrolyte. A graph of pH against mobility gives information about the binary complexes and permit to calculate their stability constants. The first and second stability constants of [Cu(II) – isoleucine], [Mn(II) – isoleucine] and [UO2(II) – isoleucine] complexes were found to be (8.41 ± 0.07; 6.43 ± 0.03), (3.87 ± 0.11; 2.61 ± 0.06) and (7.91 ± 0.13; 5.73 ± 0.04) for Cu(II), Mn(II) and UO2(II) complexes, respectively at ionic strength 0.1 Mol/L and a temperature of 35 0C
Keywords: Paper ionophoresis, overall mobility, copper(II), manganese(II) and uranyl(II), stability constants, isoleucine.
Resumen
Las constantes de estabilidad de complejos de Cu2+, Mn2+ and UO22+ con isoleucina fueron determinadas por la técnica de electroforesis en papel. El método se basa en la migración de la mancha de los iones metálicos en papel a diferentes pH en cierto electrolito. La gráfica del pH contra movilidad proporciona información sobre los compuestos binarios y permite el cálculo de las constantes de estabilidad. Las primeras y segundas constantes de estabilidad de los complejos [Cu(II) – isoleucina], [Mn(II) – isoleucina] y [UO2(II) – isoleucina] fueron (8.41 ± 0.07; 6.43 ± 0.03), (3.87 ± 0.11; 2.61 ± 0.06) y (7.91 ± 0.13; 5.73 ± 0.04) para los complejos Cu(II), Mn(II) y UO2(II), respectivamente, a fuerzas iónicas de 0.1 Mol/L y a 35 0C.
Keywords: ionoforesis en papel, movilidad, cobre(II), manganeso (II), uranilo(II), constantes de estabilidad, isoleucina.
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