The magnetic moment of coordination compounds can be measured
by the magnetic susceptibility experiments The results can be used to
obtain information about the number of unpaired electrons and hence
structures adopted by metal complexes A critical study of the magnetic data of coordination compounds of
metals of the first transition series reveals some complications For
metal ions with upto three electrons in the d orbitals, like Ti
3+ (d
1); V
3+
(d
2); Cr
3+ (d
3); two vacant d orbitals are available for octahedral
hybridisation with 4s and 4p orbitals