Near-infrared luminescence of Nd3+ and Yb3+ complexes using a polyfluorinated pyrene-based β-diketonate ligand

摘要: A new polyfluorinated β-diketonate ligand containing a pyrene chromophore, namely, 4,4,5,5,6,6,6-heptafluoro-3-hydroxy-1-(pyren-1-yl)hex-2-en-1-one (Hhfpyr) has been designed and employed for the development of series near-infrared (NIR) emitting lanthanide complexes (Nd3+ Yb3+) in absence presence an ancillary ligand, 4,7-diphenyl-1,10-phenanthroline (bath). The isolated NIR-emitting [Nd(hfpyr)3(H2O) 1, Nd(hfpyr)3(bath) 2, Yb(hfpyr)3(H2O) 3 Yb(hfpyr)3(bath) 4] have characterized by various spectroscopic techniques evaluated their photoluminescence properties. photophysical properties disclosed that developed pyrene-based is well suited sensitization Nd3+ as Yb3+ emissions, thanks to favourable position triplet state (T1) (ΔE = T1–4F3/2 4700 cm−1 ΔE T1–2F5/2 6200 Nd3+), evidenced from phosphorescence spectra corresponding Gd3+ complexes. Most importantly, displacement solvent molecules coordination sphere NIR binary (1 3) with markedly enhances quantum yields (Φoverall 0.45 1 1.07% 2 1.69 3.08% 4) excited lifetime values (τ 2.80 6.16 μs 6.88 13.45 4). Notably, ternary compound 4 promising luminescence was embedded into PMMA matrices, giving rise PMMA-supported hybrid materials (PMMA@4), where thermal stability film-forming were significantly enhanced.