Complex formation of iron (III) with eriochrome cyanine r
作者： F.J. Langmyhr , T. Stumpe
DOI: 10.1016/S0003-2670(00)88980-1
关键词: Inorganic chemistry 、 Ligand 、 Complex formation 、 Eriochrome cyanine R 、 Dimer 、 Chemistry 、 Ionic strength 、 Spectrophotometry 、 Salt (chemistry) 、 Absolute stability
摘要: Abstract The complex formation of iron(III) with the trisodium salt 5-[α-(3-carboxy-5-methyl-4-oxo-2,5-cyclohexadien-1-ylidene)-2-sulfobenzyl]-3-methylsalicylic acid (eriochrome cyanine R) was studied by spectrophotometry. pure tetrabasic ligand (H 4 ER) prepared and used in investigation. In pH range 2.7–4.2 three complexes were detected: a ring-formed dimer Fe 2 (ER) , Fe(ER) ; absolute stability constants (at an ionic strength 0.1 M at room temperature (20 ± 3°)) log k = 37.9, 22.5 17.9, respectively.
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