Formation of binuclear complexes in the reaction of chromium(II) with hexacyanoferrate(III)
- 1 January 1970
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 862-866
- https://doi.org/10.1039/j19700000862
Abstract
The reaction of Cr2+ with Fe(CN)6 3– is rapid at 25°(K > 5 × 106 l. mole–1 sec.–1). From the spectra of final solutions two products have been identified both of which are believed to be binuclear complexes. The first [peak at 370 nm. (ε 3090)] is obtained at pH values > 2, and the second [peak at 320 nm. (ε 1980)] at [H+] > 1M. The products are more strongly absorbing than the related mononuclear complexes. At intermediate hydrogen-ion concentrations both products are obtained. Because at pH 2 and [H+]= 3·0M final spectra do not vary as the temperature is varied (0–25°), it is concluded that outer-sphere reaction paths make no significant contribution. Possible structures for the two binuclear products are considered.Keywords
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