The excited-state absorption of Ru(bpy)2+3 reexamined

✍ Scribed by Andreas Hauser; Elmars Krausz

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 559 KB
• Volume: 138
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(87)80398-6

✦ Synopsis

The excited-state absorption of Ru( bpy)S+ (RBY) in the range 240 to 2200 nm is reported, extending the range and improving the resolution of previous measurements.

The excitation power dependence of the excited-state populations are quantified and absorption measurements made in Hz0 and DZO solutions at 300 K and in poly( vinyl-alcohol) (PVA) films at 20 K. No evidence is found for an intervalence charge-transfer type transition in the near IR, but the t+r *-+x* ligand excitation transrtion is clearly seen near 11000 and 9000 cm-' in solution and in PVA respectively. The visible and UV excited-state spectra are similar in the two environments and differences are attributed to the effects of photoselection in PVA. The w*+x* transition shows a marked shift m passing from a rigid to a flmd medium, indicating the possibtlity of a change in ligand geometry.