Consider two complexes: (I) [Fe(CN)6]4–, and (II) [Fe(H2O)6]2+. In view of the s
ID: 1021172 • Letter: C
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.