A crucial component of a dye-sensitized solar cell (DSC) is the sensitizer. The latter captures photons which
Question:
A crucial component of a dye-sensitized solar cell (DSC) is the sensitizer. The latter captures photons which are converted to electric current in the cell. A typical dye is cis-[Ru(L)2(NCS–N)2] where L is the bpy derivative shown below:
(a) What conformational change does the bpy ligand undergo when it binds to Ru2+?
(b) An ideal dye should absorb light over the whole visible range, and the extinction coefficient should be high over the whole absorption range. Explain why this is.
(c) The electronic transition associated with the absorption of cis-[Ru(L)2(NCS-N)2] in the visible region involves an electron in the metal t2g level and a low-lying π* MO. What is the origin of the acceptor orbital, and what is the general name for this type of transition? Relate the type of transition to the redox properties of ruthenium(II).
Step by Step Answer:
a Conformational change of bpy ligand when binding to Ru2 When the bpy 22bipyridine ligand binds to the Ru2 ion in cisRuL2NCSN2 it undergoes a conform...View the full answer
