Publications Repository - Gdańsk University of Technology

Lanthanide-calixarene hybrid materials are of particular interest due to the combination of the interesting properties of the ligand cavity-like structure and the luminescent features of lanthanides. The aim of this study was to synthesize and investigate the photophysical properties of Eu³⁺, Tb³⁺ and Gd³⁺ hybrids based on calix[4]arene-tetracarboxylate. The preparation of two structurally different Tb³⁺ compounds (calix-TA-SC-Tb and calix-TA-Tb) was dictated by the ligand to metal molar ratio and the synthesis time. Analysis of calix-TA-SC-Tb monocrystals revealed the formation of a mononuclear complex of C₂ symmetry containing Tb³⁺ coordinated by four calixarene ionized groups and formate anion encapsulated within the upper cavity. Syntheses of other hybrids failed in producing high-quality crystals and the structures could not be solved. The solid-state luminescent properties of hybrids were evaluated, and the structure/property relationship was investigated. Based on the emission and excitation spectra, the energy diagrams for calix-TA-Eu, calix-TA-Tb and calix-TAGd were proposed.

Authors

• Dr Rodrigo da_Silva_Viana,
• Carlos Alberto Fernandes de Oliveira,
• prof. dr hab. inż. Jarosław Chojnacki link open in new tab ,
• Bráulio Barros,
• Severino Alves Junior,
• dr inż. Joanna Kulesza