Consider the tetrahedral anions VO43- (orthovanadate ion), GrO42- (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 ofMnO4-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. TheGrO42- ion is yellow. Is the wavelength of the LMCT transition for chromate larger or smaller than that for MnO4-? Explain. (e) The VO43- 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.