Repozytorium publikacji - Politechnika Gdańska

The organic ligand 2,5-piperazinedione-1,4-diaceticacid (H2PDA) was synthesized under hydrothermal conditions starting from the iminodiacetic acid and catalyzed by oxalic acid. The X-ray powder diffraction data indicates that the compound crystallizes in the P21/c space group as reported in the literature. The ligand was also characterized by elemental analysis, magnetic nuclear resonance, infrared spectroscopy and thermogravimetric analysis. Two new coordination networks based on lanthanide ions were obtained with this ligand using hydrothermal reaction. In addition to single-crystal X-ray diffraction, the compounds were characterized by infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and elemental analysis. Single-crystal XRD showed that the compounds are isostructural, crystallizing in P21/n space group with chemical formula [Ln(PDA)1.5(H2O)](H2O)3 (Ln¼Gd3þ (1) and Eu3þ (2)). The luminescence properties of both compounds were studied. In the compound (1), a broad emission band was observed at 479nm, red shifted by 70nm in comparison of the free ligand.In (2), the typical f–f transition was observed with amaximum peak at 618 nm, related with the redemissionoftheeuropiumions.Computationalmethodswereperformedtosimulatethe crystal structureof (2). The theoretical calculationsoftheintensityparametersareingoodagreement with theexperimentalvalues.

Autorzy

• Fausthon Fred da Silva,
• Carlos Alberto Fernandes de Oliveira,
• Eduardo Henrique Lago Falcao,
• Claudia Cristina Gatto,
• Nivan Bezerra da Costa Jr,
• Ricardo Oliveira Freire,
• prof. dr hab. inż. Jarosław Chojnacki link otwiera się w nowej karcie ,
• Severino Alves Junior