Question

1. “Zinc complexes generally do not exhibit color regardless of their geometry” Do you agree with...

1. “Zinc complexes generally do not exhibit color regardless of their geometry”

  1. Do you agree with the above statement (yes or no)?
  2. Explain your answer to part a in a paragraph or two. You may include diagrams in you explanation if it makes it easier for you to explain.

2. (2 pts.) Explain why many coordination complexes are brightly colored.

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Answer #1

1a) Yes it's true, zinc complexes don't exhibit color regardless of their geometry.

b) Color of complexes is due to d-d transition from lower d-orbitals to higher d-orbitals. In case of zinc, all d-orbitals are completely filled in its common +2 oxidation state thus d-d transition is not possible and complexes are colorless.

D-orbitals of zinc in complexes.

2) Many coordination complexes are brightly colored because the energy gap between d orbitals is low thus they require radiation of lesser energy to show d-d transition and hence they are brighter color.

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