CoF₆^3 Absorbs Light in the Red Region of the Spectrum

question 106

Multiple Choice

CoF₆^3 absorbs light in the red region of the spectrum, while Co(NH₃) ₆^3 absorbs light in the blue region of the spectrum. This difference means that ________

• A)the splitting of the d orbitals of the two complexes is nearly identical.
• B)the value of the crystal field splitting is very small for both complexes.
• C)the crystal field splitting is larger for the ammonia complex than for the fluoride complex.
• D)the d_z² and d_x²  _y² orbitals are higher in energy than the d_xy, d_xz, and d_yz orbitals in CoF₆^{3 } and just the opposite splitting order for Co(NH₃)₆^{3 } .
• E)the d_z² and d_x²  _y² orbitals are lower in energy than the d_xy, d_xz, and d_yz orbitals in CoF₆^{3 } and just the opposite splitting order for Co(NH₃)₆^{3 } .

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