Luminescence properties of a family of lanthanide metal-organic frameworks

• Published in: Microporous and mesoporous materials 2019-05, Vol.279, p.400-406
• Main Authors: Abdelhamid, Hani Nasser, Wilk-Kozubek, Magdalena, El-Zohry, Ahmed M., Bermejo Gómez, Antonio, Valiente, Alejandro, Martín-Matute, Belén, Mudring, Anja-Verena, Zou, Xiaodong
• Format: Article
• Language: English
• Subjects: Antenna effect; Lanthanide MOFs; Luminescence; Metal-organic frameworks; Photophysical properties; Photostability
• ISSN: 1387-1811; 1873-3093; 1873-3093
• DOI: 10.1016/j.micromeso.2019.01.024

Two isostructural series of lanthanide metal-organic frameworks denoted as SUMOF-7II (Ln) and SUMOF-7IIB (Ln) (Ln = La, Ce, Pr, Nd, Sm, Eu, and Gd) were synthesized using4,4′,4''-(pyridine-2,4,6-triyl)tris(benzoic acid) (H3L2) and a mixture of H3L2 and 4,4′,4′′-(benzene-1,3,5-triyl)tris(benzoic acid) (H3BTB) as linkers, respectively. Both series were characterized using powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), thermal analysis (TGA), and photoluminescence spectroscopy. Photoluminescence measurements show that Eu-MOFs demonstrate a red emission while Pr- and Nd-MOFs display an emission in the near-infrared (NIR) range. On the other hand, La-, Ce-, Sm- and Gd-MOFs exhibit only a ligand-centered emission. The average luminescence lifetimes in the SUMOF-7IIB series are 1.3–1.4-fold longer than the corresponding ones in the SUMOF-7II series. SUMOF-7IIs show a good photo- and thermal stability. Altogether, the properties of SUMOF-7II and SUMOF-7IIB render them promising materials for applications including sensing, biosensing, and telecommunications. Two isostructural series of lanthanide metal-organic frameworks (Ln-MOFs, Ln = La, Ce, Pr, Nd, Sm, Eu, and Gd) were synthesized using 4,4′,4''-(pyridine-2,4,6-triyl)tribenzoic acid (H3L2) and mixed H3L2 and 1,3,5-tris(4-carboxyphenyl)benzene (H3BTB) as linkers, respectively, denoted SUMOF-7II and SUMOF-7IIB. Their luminescence properties were studied. The SUMOF-7IIB series show longer lifetimes (1.3–1.4-fold) and higher quantum yields (1.2-fold) than the corresponding SUMOF-7II series. SUMOF-7IIs show a good photo- and thermal stability. [Display omitted] •Synthesis and characterization of two series of lanthanide metal-organic frameworks.•Report luminescence properties of lanthanide MOFs.•Tune emission-excitation using metal nodes or organic linkers.•Improve quantum yield of MOFs via incorporation of two linkers in the same frameworks.