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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. 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. Our findings demonstrate that the near-infrared emission intensity and singlet oxygen ( 1 O 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 . This work provides a new dimension for the future design and development of molecular theranostics-based water-soluble double-decker lanthanide bisporphyrinates.

Impressive near-infrared brightness and singlet oxygen generation from strategic lanthanide–porphyrin double-decker complexes in aqueous solution