Abstract

Structures of bromo-metal complexes in concentrated aqueous solutions of FeBr2 and of CoBr2 were investigated by X-ray diffraction analysis. The complexes possess an octahedral geometry coordinating Br− along with H2O ligands. The frequency factors of metal-Br contacts per one atom of metal were 0.325 for the 2.7M (mol-dm−3) and 0.747 for the 4.5M FeBr2 solutions, and 0.280 for the 2.8M and 0.595 for the 4.3M CoBr2 solutions. The frequency factors suggested that the tendency of metal ions to forming monobromo complexes is in the order, Fe>Co>Ni<Cu.

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