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Strong Circularly Polarized Luminescence from Highly Emissive Terbium Complexes in Aqueous Solution
Author(s) -
Samuel Amanda P. S.,
Lunkley Jamie L.,
Muller Gilles,
Raymond Kenneth N.
Publication year - 2010
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.201000309
Subject(s) - terbium , luminescence , chemistry , chromophore , antenna effect , quantum yield , molecule , photochemistry , aqueous solution , ligand (biochemistry) , fluorescence , coordination sphere , crystallography , ion , optoelectronics , organic chemistry , materials science , biochemistry , physics , receptor , quantum mechanics
Two luminescent terbium(III) complexes have been prepared from chiral ligands containing 2‐hydroxyisophthalamide (IAM) antenna chromophores and their non‐polarized and circularly‐polarized luminescence properties have been studied. These tetradentate ligands, which form 2:1 ligand/Tb III complexes, utilize diaminocyclohexane (cyLI) and diphenylethylenediamine (dpenLI) backbones, which we reasoned would impart conformational rigidity and result in Tb III complexes that display both large luminescence quantum yield ( Φ ) values and strong circularly polarized luminescence (CPL) activities. Both Tb III complexes are highly emissive, with Φ values of 0.32 (dpenLI‐Tb) and 0.60 (cyLI‐Tb). Luminescence lifetime measurements in H 2 O and D 2 O indicate that while cyLI‐Tb exists as a single species in solution, dpenLI‐Tb exists as two species: a monohydrate complex with one H 2 O molecule directly bound to the Tb III ion and a complex with no water molecules in the inner coordination sphere. Both cyLI‐Tb and dpenLI‐Tb display increased CPL activity compared to previously reported Tb III complexes made with chiral IAM ligands. The CPL measurements also provide additional confirmation of the presence of a single emissive species in solution in the case of cyLI‐Tb, and multiple emissive species in the case of dpenLI‐Tb.