C.R. Hammond’s scientific contributions

... These bands correspond to the 4 T 1g(F) ® 4 T 1g(P) and 4 T 1g(F) ® 4 A 2g(F) transitions, respectively, that confirm the presence of an octahedral structure around Co(II) ion. 30,31 Ni(II) complexes exhibit three bands which are assigned to 3 A 2g(F) ® 3T 2g(F) , 3 A 2g(F) ® 3 T 1g(F) and 3 A 2g(F) ® 3 T 1g(P) transitions, respectively. Since the transition 3 A 2g ® 3 T 1g(P) generally occurs in the region of 330-400 nm in which the bands due to organic fraction of the complexes arise as well, hence this region is not useful from the point of view of drawing any conclusion about the stereochemistry around the Ni(II) centre. ...

Reference:

Mononuclear Schiff Base Complexes Derived from 5-Azophenylsalicylaldehyde with Co(II), Ni(II) Ions: Synthesis, Characterization, Electrochemical Study and Antibacterial Properties