Journal
ARABIAN JOURNAL OF CHEMISTRY
Volume 15, Issue 9, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.arabjc.2022.104089
Keywords
Lanthanide complexes; Supramolecular structure; Spectroscopy; Fluorescence, Heat capacity
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Funding
- National Natural Science Foundation of China [21803016, 21473049]
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Five lanthanide complexes with polydentate coordination were synthesized and their structures and properties were studied in detail, including fluorescence and heat capacity properties, as well as the explanation of the fluorescence enhancement mechanism.
Five lanthanide complexes with polydentate coordination were successfully synthesized by volatilization of 2,4-difluorobenzoate and o-phenanthroline ligands. The structure general formula is [Ln(2,4-DFBA)(3)(phen)](2), (Ln = La(1), Gd(2), Tb(3), Dy(4), Ho(5); 2,4-DFBA = 2,4-difluorobenzoate, phen = o-phenanthroline). The crystal structures of five complexes were determined, and supramolecular structures were probed. Characterization was performed by elemental analysis, IR, Raman spectroscopy and XRD, followed by an examination of the fluorescence and heat capacity properties. The molar heat capacities of complexes 4 and 5 were determined in detail by the DSC apparatus, and the thermodynamic functions were calculated. Finally, the fluorescence properties of complexes 3 and 4 were investigated. Using DFT, the HOMO, LUMO energy levels of the ligands and their single and triplet state energy levels were calculated at the level of the valence layer cleavage 6-311G(d,p) basis group, and the fluorescence enhancement mechanism was explained from the energy transfer perspective. (C) 2022 The Author(s). Published by Elsevier B.V. on behalf of King Saud University.
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