Three resorcin[4]arene-based lanthanide-coordination polymers with multifunctional photoluminescence sensing...

Area of Science:

• Coordination Chemistry
• Materials Science
• Luminescence

Background:

• Lanthanide-coordination polymers (Ln-CPs) are attractive for their unique luminescent and magnetic properties.
• Developing functional organic linkers is crucial for tailoring the structures and properties of Ln-CPs.
• Resorcinarene derivatives offer versatile platforms for designing complex supramolecular architectures.

Purpose of the Study:

• To synthesize and characterize novel octacarboxylate-functionalized resorcinarene-based lanthanide-coordination polymers.
• To investigate the luminescent properties and sensing capabilities of the synthesized Ln-CPs.
• To explore the potential of these materials for selective detection of specific analytes.

Main Methods:

• Solvothermal synthesis of three isostructural lanthanide-coordination polymers using a novel octacarboxylate-functionalized resorcinarene linker.
• Structural characterization via X-ray diffraction to elucidate the 2D sandwich-based layered structures.
• Photoluminescence spectroscopy to study emission properties, lifetimes, and sensing mechanisms.

Main Results:

• Three isostructural Ln-CPs, [(CH3)2NH2][Ln2(HL)(H2O)7]·2H2O (Ln = Tb, Eu, Gd), were successfully synthesized.
• Tb- and Eu-based CPs (1 and 2) exhibited strong green and red luminescence, respectively, with long lifetimes attributed to the linker's antenna effect.
• CPs 1 and 2 demonstrated selective luminescence sensing for N,N-dimethylformamide (turn-on) and Fe3+ ions (turn-off).

Conclusions:

• The novel octacarboxylate-functionalized resorcinarene linker effectively constructs 2D sandwich-based lanthanide-coordination polymer layers.
• The synthesized Ln-CPs display efficient luminescence and potential for selective chemical sensing applications.
• The study highlights the promise of rationally designed resorcinarene-based CPs in luminescence-based detection systems.