Thus, the energy of the two eg
orbitals will increase by (3/5)
Do and that of the three t2g will
decrease by (2/5)Do The crystal field splitting,
Do, depends upon the field
produced by the ligand and
charge on the metal ion Some
ligands are able to produce
strong fields in which case, the
splitting will be large whereas
others produce weak fields
and consequently result in
small splitting of d orbitals In general, ligands can be arranged in a series in the order of increasing
field strength as given below:
I
– < Br
– < SCN
– < Cl
– < S
2– < F
– < OH
– < C2O4
2– < H2O < NCS
–
< edta
4– < NH3 < en < CN
– < CO
Such a series is termed as spectrochemical series