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 The magnetic behaviour of these
free ions and their coordination entities is similar