The magnetic data agree with maximum spin pairing in many cases,
especially with coordination compounds containing d
6 ions However,
with species containing d
4 and d
5 ions there are complications [Mn(CN)6]
3–
has magnetic moment of two unpaired electrons while [MnCl6]
3– has a
paramagnetic moment of four unpaired electrons [Fe(CN)6]
3– has magnetic
moment of a single unpaired electron while [FeF6]
3– has a paramagnetic
moment of five unpaired electrons