Structural and spectroscopic investigation of new luminescent hybrid materials based on calix[4]arene-tetracarboxylate and Ln{sup 3+} ions (Ln = Gd, Tb or Eu)
- Department of Fundamental Chemistry, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235 - Cidade Universitária, 50670-901 Recife, PE (Brazil)
- Department of Inorganic Chemistry, Chemical Faculty, Gdansk University of Technology, G. Narutowicza 11/12 Street, 80-233 Gdansk (Poland)
- Department of Mechanical Engineering, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235 - Cidade Universitária, 50670-901 Recife, PE (Brazil)
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.
- OSTI ID:
- 22742005
- Journal Information:
- Journal of Solid State Chemistry, Vol. 251; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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