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Author Viana, R. S. ♦ Oliveira, C. A. F. ♦ Chojnacki, J. ♦ Barros, B. S. ♦ Alves-Jr, S. ♦ Kulesza, J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ EMISSION SPECTRA ♦ ENERGY LEVELS ♦ EUROPIUM IONS ♦ FORMATES ♦ GADOLINIUM IONS ♦ MATERIALS ♦ RARE EARTHS ♦ SYNTHESIS ♦ TERBIUM IONS
Abstract 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 Eu{sup 3+}, Tb{sup 3+} and Gd{sup 3+} hybrids based on calix[4]arene-tetracarboxylate. The preparation of two structurally different Tb{sup 3+} 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 C{sub 2} symmetry containing Tb{sup 3+} 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-TA-Gd were proposed. - Highlights: • Isostructural Eu{sup 3+}, Tb{sup 3+} and Gd{sup 3+} calixarene-hybrids were prepared. • Two different Tb{sup 3+}-hybrids formation dependent on molar ratio and synthesis time. • Structure/luminescent properties relationship was investigated. • Diagrams of energy levels for Ln-hybrids were proposed.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-07-15
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 251


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