Questions/Coordination Compounds/Arrange $$[Co(NH_3)...
Crystal Field Theory (CFT)Coordination Compounds

Arrange [Co(NH3)6]3+[Co(NH_3)_6]^{3+} , [Co(CN)6]3[Co(CN)_6]^{3-} , and [Co(H2O)6]3+[Co(H_2O)_6]^{3+} in increasing order of wavelength of light absorbed.

Expert Answer

[Co(CN)6]3<[Co(NH3)6]3+<[Co(H2O)6]3+[Co(CN)_6]^{3-} < [Co(NH_3)_6]^{3+} < [Co(H_2O)_6]^{3+} . Stronger ligands cause larger splitting ( Δo\Delta_o ), requiring higher energy (shorter wavelength) for absorption.

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