5.3
Crown Ether Assembly Based on Lanthanide Metal
Among the various functional materials, lanthanide-luminescence-based ones have
attracted considerable attention in recent years, owing to their unique photo-physical
characteristics [22–25]. Their characteristic sharp emission and clearly defined bands
have been applied within a number of technologies, such as organic light-emitting
diodes [26], sensors [27], novel display devices [28], and biological applications
[29]. In addition, they could also be used to the time-gated detection techniques due
to their long lifetimes [30]. The obvious features of lanthanide metals make them
ideal and highly desirable candidates for integration into luminescent supramolecular assembly, resulting in the emission signals that could be modulated by an external
stimulus, including ions, pH, light, temperature, vapors, redox, small molecules, etc.
Fig. 4 (a) Molecular structure of rotaxane. (b) Synthesis of the mechanophore-containing polyurethane. (c) Schematic illustration of rotaxane-based mechanoluminophores [20]. (Adapted with
permission [20]. Copyright 2018, American Chemical Society)
5 Photoluminescent Crown Ether Assembly
113
Crown Ether Assembly Based on Lanthanide Metal
Among the various functional materials, lanthanide-luminescence-based ones have
attracted considerable attention in recent years, owing to their unique photo-physical
characteristics [22–25]. Their characteristic sharp emission and clearly defined bands
have been applied within a number of technologies, such as organic light-emitting
diodes [26], sensors [27], novel display devices [28], and biological applications
[29]. In addition, they could also be used to the time-gated detection techniques due
to their long lifetimes [30]. The obvious features of lanthanide metals make them
ideal and highly desirable candidates for integration into luminescent supramolecular assembly, resulting in the emission signals that could be modulated by an external
stimulus, including ions, pH, light, temperature, vapors, redox, small molecules, etc.
Fig. 4 (a) Molecular structure of rotaxane. (b) Synthesis of the mechanophore-containing polyurethane. (c) Schematic illustration of rotaxane-based mechanoluminophores [20]. (Adapted with
permission [20]. Copyright 2018, American Chemical Society)
5 Photoluminescent Crown Ether Assembly
113