(a) A Tanabe-Sugano energy level diagram for a d6 octahedral complex is shown be

Question

(a) A Tanabe-Sugano energy level diagram for a d6 octahedral complex is shown below. Note that the x-axis is actually /B/10 (i.e., a value of 3 is actually 30 /B) Numbered arrows representing d-d transitions are drawn at appropriate values of /B for CoF63-and Co(H2NCH2CH2NH2)33+. Knowing what you do about the spectrochemical series, which arrows apply to which complex? Defend your answer with a sentence or two of explanation (b) why is there a discontinuity in the slopes of the lines at one particular value of /B? 70 60 20 10 A, A/B (c) How many spin-allowed transitions would you predict for each compound? CoF63 is expected to have Co(H2NCH2CH2N23+isexpected to have tr transitions

Explanation / Answer

a)

F- is a weak ligand. Thus forms high spin complexes.

NH2CH2CH2NH2 is a strong ligand. It forms weak spin complexes.

Thus the arrow shown left to the vertical line corresponds to CoF63- complex and 5 arrows on the right of vertical partition correspond to Co(H2NCH2CH2NH2)33+

b)

At the particular del/B value, the magnetic field exerted by the ligands are so high that it forces high spin complexes to be low spin. This is due to the increase in energy gap between the states.

Thus there is discontinuity in the slopes.

c)

1 for CoF63-

and 5 for Co(H2NCH2CH2NH2)33+

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