Consider two complexes: (I) [Fe(CN)6]4–, and (II) [Fe(H2O)6]2+. In view of the s

Question

Consider two complexes: (I) [Fe(CN)6]4–, and (II) [Fe(H2O)6]2+. In view of the spectrochemical series, which one of the following sets of predictions is most likely correct? Spectrochemical Series I– < Br– < Cl– < F– < OH– < H2O < NH3 < NO2 – < CN– < CO

a. I is low spin, II is high spin, and II absorbs light at the shorter wavelength. b. I is low spin, II is high spin, and I absorbs light at the shorter wavelength. c. I is high spin, II is low spin, and I absorbs light at the shorter wavelength. d. Both have 6 d electrons, so both are high spin. e. Both have 6 d electrons, so both are low spin.

Any good source of explanation?

Explanation / Answer

(I) [Fe(CN)6]4–, and (II) [Fe(H2O)6]2+

Answer: a. I is low spin, II is high spin, and II absorbs light at the shorter wavelength.

low spin complex has high energy and is low stable so it will absorb less energy.

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