question_answer 92)

  Why are different colours observed in octahedral and tetrahedral complexes for the same metal and same ligands?  

Answer:

                    Extent of splitting of d-orbil-i.ls is different in octahedral and tetrahedral field. CFSE in octahedral and tetra federal held are closely related as.                       where,  =-crystal field  splitting energy in tetrahedral field  = crystal field splitting energy in octahedral field Wavelength of light and CFSE are related to each other by formula                                        So, higher wavelength of light is absorbed in octahedral complexes than tetrahedral complexes for same metal and ligands. Thus, different colours are observed.