Answer: Consider the tetrahedral anions VO4 3-
Chapter , Problem 82AE(choose chapter or problem)
Problem 82 AE
Consider the tetrahedral anions VO4 3- (orthovanadate ion), CrO4 2- (chromate ion), and MnO4 -(permanganate ion). (a) These anions are isoelectronic. What does this statement mean? (b)Would you expect these anions to exhibit d-d transitions? Explain. (c) As mentioned in “A Closer Look” on charge-transfer color, the violet color of MnO4 - is due to a ligand-to-metal charge transfer (LMCT) transition. What is meant by this term? (d) The LMCT transition in MnO4 - occurs at a wavelength of 565 nm. The CrO4 2- ion is yellow. Is the wavelength of the LMCT transition for chromate larger or smaller than that for MnO4 -? Explain. (e) The VO4 3- ion is colorless. Do you expect the light absorbed by the LMCT to fall in the UV or the IR region of the electromagnetic spectrum? Explain your reasoning.
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