Zero-phonon lines and luminescence line narrowing in the series Ru(bpy-d8)x(bpy)3-x(PF6)2(x=1–3). Direct evidence for localization in the two lowest excited states
✍ Scribed by Hans Riesen; Elmars Krausz; Mirek Puza
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 479 KB
- Volume
- 151
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Luminescence
and excitation measurements were performed on single crystals of specifically deuterated compounds Ru( bpy-d,) ,(bpy) 3_ ,( PF,) 2 (x= l-3) in the region of the sharp zero-phonon transitions at 4.2 and 2.1 K. The results are compared with the spectroscopic properties of the non-deuterated compound (.r=O). Strong evidence for the existence of localized, non-degenerate excited states is obtained. However, fast intramolecular excitation energy transfer takes place even at 2.1 K. This leads the excitation in the Ru(bpy-ds),(bpy),_,y(PF6), (x= 1-2) systems to be trapped on the protonated metal-ligand subunit(s) at temperatures below 10 K. Selective excitation allows luminescence as well as excitation features to be narrowed.