Coordination Compounds Part 1

The compound containing [Fe(H2O)6]2 cation and [Fe(CN)6] anion must be [Fe(H2O)6]2‌[Fe(CN)6]. It contains 2[Fe(H2O)6]2+ cation and [Fe(CN)6]4– anion in which Iron is present as Fe2+ ion. In [Fe(H2O)6]2+ since H2O is weak ligand there will be 4 unpairedelectrons with 4.9 BM while in [Fe(CN)6]4– all the electrons are paired as the CN– is strong ligand with zero unpaired electrons and zero magnetic moment.