The pertechnetate ion, TcO4 -, is often used to introduce the radioactive Tc into compounds, some of which are used as medical tracers. Unlike the isoelectronic, vividly purple permanganate ion, pertechnetate is very pale red.
a. Describe the most likely absorption that gives rise to colors in these ions. In addition to a written description, your answer should include an energy-level sketch showing how d orbitals on the metals interact with oxide orbitals to form molecular orbitals.
b. Suggest why TcO4 - is red but MnO4- is purple.
c. The manganate ion, MnO4 2- , is green. On the basis of your answers to a and b, provide an explanation for this color.
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