Vibrational circular dichroism (VCD) spectra were measured on the
chloroform solutions of a series of mixed-ligand diamagnetic Co(III)
(n = 0–3, tfac = 1,1,1-trifluoro-2,4-pentanedionato; acac =
acetylacetonato). Distinct differences were observed in the VCD
spectra among the geometrical isomers of the same ligand
composition. Such differentiation was hardly possible by their
infra-red spectra alone. The structural identification of these
isomers was performed in conjunction with DFT calculations.