1/12/2024 0 Comments Lanthanide absorption spectra![]() To circumvent this issue, π-conjugated hetero-macrocycles, such as porphyrins, possessing (i) high-absorption cross-sections, (ii) triplet states resonating well with lanthanide absorption bands, and (iii) four “hard” nitrogen donor atoms matching “hard” lanthanides, have become promising antenna in use for optimal energy sensitization and protective coordination 8, 9, 10, 11, 12, 13, 14. However, challenges remain that lanthanides are intrinsically constrained by the Laporte-forbidden 4 f–4 f transitions that render their direct excitation rather inefficient 6, 7. Near-infrared (NIR) luminescent lanthanide materials have been widely utilized and increasingly researched in telecommunications engineering, laser technology, and biomedical science by virtue of their extraordinary photophysical properties 1, 2, 3, 4, 5. This work provides a new dimension for the future design and development of molecular theranostics-based water-soluble double-decker lanthanide bisporphyrinates. Our findings demonstrate that the near-infrared emission intensity and singlet oxygen ( 1O 2) quantum yields of YbDD and GdDD in aqueous media are higher than those of the reported capped lanthanide monoporphyrinato analogues, YbN and GdN the brightness and luminescence lifetime in water of YbDD are greater than those of YbN. Herein, four water-soluble homoleptic lanthanide ( Ln = Gd, Er, Yb and La) sandwiches with diethylene-glycol-disubstituted porphyrins ( DD) are reported, with their structures proven by both quantum chemical calculations and scanning tunneling microscopy. Although lanthanide double-decker complexes with hetero-macrocyclic ligands as functional luminescent and magnetic materials have promising properties, their inferior water solubility has negated their biomedical applications.
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