The quantum yield for pyridine displacement by aquation from [Ru(NH,),(py)12+ on irradiation a t the metal-to-ligand charge-transfer band is a function of the solution pH indicating competitive acid-dependent and acid-independent reactions of a short-lived intermediate or excited state.PREVIOUSLY we have shown1 that photolysis at the metalto-ligand charge transfer (MLCT) band (408nm) of the penta-amminepyridineruthenium(r1) cation leads to several photoaquation products [equation (l), L = pyridine]. We report here that the specific quantum yield (@,,) for the photoaquation of pyridine from [Ru (NH,) ,(py)I2+ [equation (la)] is a complicated function of the acid concentration of the photolysis solution. To our knowledge, this is (a) . .
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