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Researchers developed new, low-water coordination polymers (CPs) using lanthanide ions and 5-aminoisophthalic acid. These materials show promising photoluminescent properties for potential applications in chemical sensing devices.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Luminescence

Background:

  • Developing reproducible methods for photoluminescent coordination polymers (CPs) is crucial for luminescence and chemical sensing.
  • Lanthanide-based coordination polymers (LnCPs) utilizing isophthalic acid derivatives offer cost-effectiveness and diverse applications.
  • Photoluminescent properties of CPs are sensitive to water content within their crystal structures.

Purpose of the Study:

  • To synthesize novel lanthanide-based coordination polymers (LnCPs) with minimal water content.
  • To explore the influence of dimensionality, metal ion, co-ligand, and water content on the photoluminescent properties of LnCPs.
  • To investigate the potential of these LnCPs in sensing applications through encapsulation in polymer films.

Main Methods:

  • Hydrothermal and microwave-assisted synthesis of one- and two-dimensional (1D and 2D) LnCPs.
  • Utilized 5-aminoisophthalic acid with samarium(III) (Sm3+) and terbium(III) (Tb3+) ions.
  • Characterization via single-crystal X-ray diffraction (SCRXD), powder X-ray diffraction (PXRD), FT-IR, and scanning electron microscopy (SEM).

Main Results:

  • Successfully synthesized unprecedented LnCPs with varying dimensionality.
  • Photoluminescence (PL) properties were studied in solid-state powders and poly(methyl methacrylate) (PMMA) films.
  • PL characteristics were found to be dependent on structural dimensionality, metal ion, co-ligand, and residual water content.

Conclusions:

  • The synthesized LnCPs exhibit tunable photoluminescent behavior.
  • The findings pave the way for designing advanced materials for chemical sensing.
  • Green chemistry principles were considered in the synthesis approach.