For both Co 2+ and Co 3+ , predict the electronic absorption specta (d-d transit

Question

For both Co2+ and Co3+, predict the electronic absorption specta (d-d transitions only) of a tetradhedral complex, a weak-field octahedral complex, and a strong-field octahedral complex. Include the number of d-d transitions that may be observed, the symmetry labels for each transition, and the approximate size of their molar extinction coefficients.

Fill in the chart for Co2+ complexes.

Complex Number of Possible d-d Transitions Symmetry Labels for Transitions Extinction Coefficient Range Co2+ tetrahedral Co2+ octahedral (weak field) Co2+ octahedral (strong field)

Explanation / Answer

in tetrahedral molecule there is d-p mixing so the extinction coefficient is high but in the octahedral molecule there is d-d transition. strong field does not obey orgel rule it obeys tanabe-sugano hence in strong field there is so many transition

0 Td 100-1000 3 Oh 2-5 many Oh 8-10

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