Question

Absorption maxima values for the most intense peaks are given for the following UV-Visible Spectrum:

for [Co (en)₃] Cl₃ : 465 nm

for [Co(NH₃)₆]³⁺ (aq): 480 nm

for [Co(NO₂)₆]^_3- (aq): 358 nm

for [Co(gly)₃] (aq); 542 nm

for [Co(ox)₃]^3- (aq): 422 nm

for [Co(OH₂)₆]³⁺ (aq): 607 nm

Based on the given data above, explain how the identity of donor atom leads to an increase or decrease in energy separation b/w the ground and excited state in cobalt (III) complexes.

Answer 1

Ox ligand is considered oxalate in the answer but according to spectrochemical series its a weak field ligand and should have least wavelength among the complexes. Please check it