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

question 19

Multiple Choice

CoF₆^3- absorbs light in the red region of the spectrum, while Co(NH₃) ₆³⁺ absorbs light on 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)₆³⁺.
• 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)₆³⁺.

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