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The interaction of Fe(CN)inf6sup4−ions with the copper(II)-EDTA complex in alkaline solutions

✍ Scribed by Eugenijus Norkus; Algirdas Vaškelis; Rasa Pauliukaitė

Publisher: Springer
Year: 1996
Tongue: English
Weight: 357 KB
Volume: 21
Category: Article
ISSN: 0340-4285
DOI: 10.1007/bf00140775

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✦ Synopsis

The Cu n complex with EDTA GuY 2-(y4-= anion of ethylenediaminetetraacetic acid) was shown to interact with hexacyanoferrate(II), Fe(CN)64-, in alkaline solutions to form a mixed complex with a light absorption maximum at 495nm (molar absorbance ca. 4OOOdm 3 tool-1 cm-1). From spectrophotometric data a possible composition of the new complex was proposed [Cu2YFe(CN)~-] and the equilibrium constant of complex formation reaction: Ke y4 -2CuY 2-+ Fe(CN)~-~ CuzYFe(CN)64-+ was determined (log Ke = -1.7 + 0.1).

The formation of new complex compounds of similar type was shown by spectrophotometric measurements at interaction of Fe(CN)64-ions with Cu n complexes with other aminocarboxyacids, e.g. EGTA, NTA, HEDTA and DTPA.

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