Question

What are the crystal field Splitting energy and the spin only moment in Bohr Magneton for the complex K3[Fe(CN)6] ?

Answer 1

hexacyanoferrate(III) ion. we have five d-electrons. Here strong cyanide ligand causes greater d-orbital splitting. The octahedral splitting energy,

Δ

o

becomes high. During filling up process the first three electrons go into

t

2g

orbitals. Now, however, the splitting energy is much greater so it is less energetically costly for electrons to pair up in the t2g orbitals than to go into the eg orbitals and LOW SPIN complex is formed.