Heteronuclear complexation in the system 1-hydroxyethylidenediphosphonic acid—manganese(II)—gadolinium(III) in aqueous solution

Journal Article · Wed Nov 15 04:00:00 EST 2017 · Russian Chemical Bulletin

DOI:https://doi.org/10.1007/S11172-017-1985-3· OSTI ID:22863436

Devyatov, F. V.; Zaripova, G. I. ^[1]

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1. Kazan (Volga Region) Federal University (Russian Federation)

pH-Potentiometric method in combination with mathematical modeling was used to study the system manganese(II)—gadolinium(III)—1-hydroxyethylidenediphosphonic acid (HEDP, H{sub 4}L). When both cations simultaneously are present in the solution, the accumulation of heteronuclear forms with the ratio of Gd: Mn: HEDP equal to 1: 1: 1, 1: 1: 2, and 1: 1: 3 was observed already in the strongly acidic pH region, while from homonuclear forms only five complexes were detected in the solution, namely, MnL{sub 2}{sup 6–}, GdH{sub 4}L{sub 2}{sup –}, GdH{sub 2}L{sup +}, KGd{sub 2}HL{sub 2}↓, and K{sub 3}Gd{sub 2}L{sub 2}(OH)↓. It was concluded that heteronuclear complexes are much stronger and replace homonuclear forms in solution.

• OSTI ID: 22863436
• Journal Information: Russian Chemical Bulletin, Journal Name: Russian Chemical Bulletin Journal Issue: 11 Vol. 66; ISSN RCBUEY; ISSN 1066-5285
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
AQUEOUS SOLUTIONS
BUILDUP
CATIONS
COMPLEXES
CONTRAST MEDIA
GADOLINIUM
MAGNETIC RESONANCE
MANGANESE
MATHEMATICAL MODELS
PH VALUE
POTENTIOMETRY