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Ruthenium Imidazophenanthrolinium Complexes with Prolonged Excited‐State Lifetimes
Author(s) -
Staehle Robert,
Reichardt Christian,
Popp Jürgen,
Sorsche Dieter,
Petermann Lydia,
Kastner Katharina,
Streb Carsten,
Dietzek Benjamin,
Rau Sven
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201500021
Subject(s) - chemistry , ruthenium , excited state , atomic orbital , photochemistry , ligand (biochemistry) , bromide , raman spectroscopy , emission spectrum , absorption spectroscopy , bipyridine , resonance (particle physics) , spectroscopy , crystallography , crystal structure , spectral line , inorganic chemistry , catalysis , electron , atomic physics , organic chemistry , biochemistry , physics , receptor , quantum mechanics , astronomy , optics
A series of ruthenium polypyridyl complexes [Ru(tbbpy) 3 ][PF 6 ] 2 ( 0 , tbbpy = 4,4′‐di‐ tert ‐butyl‐2,2′‐bipyridine), [Ru(tbbpy) 2 (bbip)][PF 6 ] 3 { 1 , (bbip)Br = 1,3‐(bisbenzyl)‐1 H ‐imidazo[4,5‐ f ][1,10]phenanthrolinium bromide}, [Ru(tbbpy)(bbip) 2 ][PF 6 ] 4 ( 2 ), and [Ru(bbip) 3 ][PF 6 ] 5 ( 3 ) were synthesized. The new complexes 2 and 3 were fully characterized, and their X‐ray crystal structures, absorption and emission spectra, quantum yields of emission, and cyclic voltammograms were determined. Within this series, a trend towards increased lifetime and quantum yields of emission can be observed, especially in the presence of oxygen. The location of the first excited state on the imidazophenanthrolinium ligands has been elucidated by resonance Raman spectroscopy of 1 and 3 , which revealed that the energy of the π* orbitals of the bbip ligands is lower than that of the π* orbitals of the tbbpy ligand.