Structures and luminescent properties of two Tb(III) coordination polymers with aromatic dicarboxylates

Luminescent Coatings Based on (3-Aminopropyl)triethoxysilane and Europium Complex β-Diketophosphazene

The reaction of β-diketophosphazene with the europium (III) salt synthesized the corresponding metal complex which was structured with (3-aminopropyl)triethoxysilane and treated with dibenzoylmethane for additional coordination of europium atoms. The polymer thus obtained exhibits luminescence with a maximum of 615 nm, which is characteristic of europium. The polymer is thermally stable up to 300 °C, the coating based on it has a contact angle of 101°, and the adhesive strength of the coating to non-finished glass (according to ISO 2409: 2013) is 1 point.

Syntheses, Structures and Luminescent Properties of Eu- and Tb-MOFs with 3,5-Pyridinedicarboxylate and 1,2-Benzenedicarboxylate

Two lanthanide-based MOFs (Ln-MOFs) were synthesized by reaction of Eu(III) or Tb(III) perchlorates with mixed dicarboxylates of 3,5-pdc and 1,2-bdc (3,5-H₂pdc = 3,5-pyridinedicarboxylic acid; 1,2-H₂bdc = 1,2-benzenedicarboxylic acid) by hydrothermal method. The chemical formulas of the two complexes were [Eu₂(3,5-pdc)(1,2-bdc)₂(H₂O)₄]_n (1) and {[Tb₂(3,5-pdc)(1,2-bdc)₂(H₂O)₄]·2H₂O}_n (2). IR spectra and element analyses were tested to characterize the two compounds. The crystal structures were determined by X-ray single crystal diffraction. MOF 1 was 3D porous network structure but MOF 2 was 2D layered structure. The two MOFs emitted the characteristic fluorescence of Eu(III) or Tb(III) ion with the excitations of UV-rays. Their lifetimes of excited states for Eu(III) (⁵D₀) and Tb(III) (⁵D₄) were 0.31 and 0.82 ms. The absolute quantum yields (Ф_a) of MOF1 and 2 were also tested and the Ф_a(1) (λ_ex = 320 nm) and Ф_a(2) (λ_ex = 296 nm) were 15% and 48%, respectively.