Highly luminescent lanthanide complexes sensitised by tertiary amide-linked carbostyril antennae. Issue 31 (20th June 2018)

• Record Type: Journal Article
• Authors: Kovacs, Daniel; Phipps, Dulcie; Orthaber, Andreas; Borbas, K. Eszter
• Is Part Of: Dalton transactions. Volume 47:Issue 31(2018)
• Page Start: 10702
• Page End: 10714
• Publication Date: 2018-06-20
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt01270a
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The replacement of the secondary amide linker that carries the sensitizing carbostyril antenna with a tertiary amide in luminescent Eu and Tb complexes dramatically increases the lanthanide emission quantum yields. Abstract : Carbostyrils are among the most widely used sensitising antennae for luminescent lanthanides; they afford bright complexes with Eu and Tb, and can also sensitise the emissions of the less commonly used Sm, Dy, Yb and Nd. Systematic studies on the effect of structural variations on the photophysical properties and lanthanide sensitising abilities of carbostyrils can therefore have a large impact. We replaced the secondary amide linker that connects the metal binding site to the antenna with a carboxymethyl-substituted tertiary amide. Eight Tb and Eu complexes were prepared. All had higher lanthanide luminescence quantum yields ( Φ Ln ) than their secondary amide analogues; three Tb emitters had Φ Tb > 40%. Eu complexes had Φ Eu up to 11.6%. The antenna singlet and triplet excited states are slightly shifted, while the metal coordination sphere is unchanged by the introduction of the carboxymethyl group.