in which of the foll octahedral complexes will the magnitude of /_o (delta not) be the highest?
[Co(CN)6]3- , [Co(H2O)6]3+ , [Co(C2O4)]3- , [Co(NH3)6]3+
The correct answer is : [Co(CN)6]3-
The ligands are arranged in order of their abilities to split d orbital energies of transition metals i. e. according to the magnitude of in spectrochemical series. as shown below:
I- <Br- < S2- < SCN- < Cl- < NO3- < N3- < F- < OH- < C2O42-< H2O < NCS- < CH3CN < py < NH3 < en < bipy
< phen < NO2- < PPh3 < CN- < CO
Among the given complexes in question, all have common transition metal with same oxidation state i.e.Co3+. They have different value of according to ligand. According to spectrochemical series CN- will give maximum value of .
Similar example for Cr3+ complex is shown below:
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The ligands are arranged in order of their abilities to split d orbital energies of transition metals i. e. according to the magnitude of in spectrochemical series. as shown below:
I- <Br- < S2- < SCN- < Cl- < NO3- < N3- < F- < OH- < C2O42-< H2O < NCS- < CH3CN < py < NH3 < en < bipy
< phen < NO2- < PPh3 < CN- < CO
Among the given complexes in question, all have common transition metal with same oxidation state i.e.Co3+. They have different value of according to ligand. According to spectrochemical series CN- will give maximum value of .
Similar example for Cr3+ complex is shown below: