Question

N3 and its diprotonated counterpart N179 perform this process as a means of “injection” in the presence of triiodide (“tri-iodide”). The Grätzel (“GRET-sell”) group demonstrated that the ability of bipy (“bippy”) dyes to undergo this process makes them excellent panchromatic photosensitizers for solar cells. The bands produced by this process are broadened by solvatochromism. Impurities capable of this process produce (-5[1])the blue color of lapis lazuli and sapphires. This process routinely produces extinction coefficients exceeding 10,000 units, and is responsible for the intense colors of tetra-oxo complexes (10[1]-5[1])like the permanganate (-5[1])ion. (-5[1])This class of Laporte-allowed (-5[1])absorptions comprises the entire spectrum (-5[1])of d0 (“D-zero”) and d10 (“D-ten”) metal centers, which are incapable of d–d transitions. For 10 (10[1])points, name these strong transitions that include metal-to-ligand and ligand-to-metal (10[1])varieties. (10[4])■END■ (10[2]0[16])

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