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Long‐Lived, Emissive Excited States in Direct and Amide‐Linked Thienyl‐Substituted Ru II Complexes
Author(s) -
Majewski Marek B.,
Smith Jeremy G.,
Wolf Michael O.,
Patrick Brian O.
Publication year - 2016
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.201501436
Subject(s) - chemistry , excited state , homoleptic , photochemistry , amide , ultrafast laser spectroscopy , diimine , quantum yield , conjugated system , quenching (fluorescence) , ligand (biochemistry) , emission spectrum , bipyridine , crystallography , spectroscopy , fluorescence , spectral line , crystal structure , metal , atomic physics , organic chemistry , biochemistry , physics , polymer , receptor , quantum mechanics , catalysis , astronomy
The excited state behavior of a new series of homoleptic and heteroleptic Ru II complexes bearing thienyl groups appended to a 2,2′‐bipyridine chelating ligand via direct, secondary and tertiary amide linkages is examined. The results of nanosecond transient absorption spectroscopy, emission lifetime measurements and bimolecular quenching experiments are correlated to determine that although the amide linkage does not act as a conjugated bridge to the peripheral substituents, it does not preclude possible electron transfer processes. Complexes bearing directly bound thienyl and bithienyl substituents exhibit long excited state and emission lifetimes ( τ em = 2 and 15 µs), with high emission quantum yields in solution ( Φ = 0.35) and slow rates of non‐radiative decay.