Journal
CHEMPHOTOCHEM
Volume 6, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cptc.202200053
Keywords
chromophores; N-heterocyclic carbenes; photostability; quantum yields; ruthenium
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Funding
- Studienstiftung des deutschen Volkes
- Deutsche Forschungsgemeinschaft (German Research Foundation) [TRR234, 364549901]
- Projekt DEAL
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Six different monoarylated N-aryl-1H-imidazo[4,5-f][1,10]phenanthroline (Rip) ligands and their corresponding ruthenium complexes [(tbbpy)(2)Ru(Rip)](2+) Ru(Rip) have been synthesized. The structural, photophysical, photochemical, and electrochemical properties of the complexes were characterized. The results showed that the monoarylated Ru(Rip) complexes exhibited higher luminescence quantum yields compared to [Ru(bpy)(3)](2+) under inert conditions, while the Ru(RR'ip) complexes with imidazolium unit had notable loss of quantum yields.
Six different monoarylated N-aryl-1H-imidazo[4,5-f][1,10]phenanthroline (Rip) ligands and their corresponding ruthenium complexes [(tbbpy)(2)Ru(Rip)](2+) Ru(Rip) have been synthesized bearing different aryl substituents on the imidazole unit including electron donating and accepting groups. N,N'-disubstitution on the imidazole unit yielded five new 1-aryl-3benzyl-1H-imidazo[4,5-f][1,10]phenanthrolinium bromide (RR'ip)(+) ligands and the corresponding ruthenium complexes [(tbbpy)(2)Ru(RR'ip)](3+) Ru(RR'ip). All complexes were characterized in terms of their structural, photophysical, photochemical and electrochemical properties. The photophysical data revealed a high luminescence quantum yield (21.6-22.8%) for monoarylated Ru(Rip) complexes compared to [Ru(bpy)(3)](2+) (9.5%) under inert conditions. Generating the imidazolium unit, yielding Ru(RR'ip)-complexes lead to notable loss of quantum yields. Furthermore, we observed an enhanced photostability of Ru(RR'ip) complexes in the case of ortho substituted aryl groups.
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