Dan-Dan Du, N. Ren, Jianjun Zhang
Apr 26, 2021
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Influential Citations
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Journal
Journal of Solid State Chemistry
Abstract
Abstract A family of lanthanide-based self-assembling complexes constructed from 2-fluorobenzoic acid and 5,5'-dimethyl-2,2'-bipyridine have been successfully fabricated via conventional synthesis, namely, [Ln(2-FBA)3(5,5'-DM-2,2'-bipy)]2 (2-FBA = 2-fluorobenzoate, 5,5’-DM-2,2'-bipy = 5,5'-dimethyl-2,2'-bipyridine, Ln = La(1), Pr(2), Nd(3), Sm(4), Gd(5), Dy(6), Ho(7), Er(8)). The obtained complexes are investigated by means of elemental analysis, IR spectra, Raman spectra and single-crystal X-ray diffraction. Crystallographic results exhibit that each Ln3+ ion of them is located in a distorted triangular prism coordination sphere finished by seven oxygen atoms of 2-FBA ligands and two nitrogen atoms of 5,5'-DM-2,2'-bipy ligand. Interestingly, although complexes 1-6 and 7-8 have the same formula unit, the differences in hydrogen bond interactions lead to different supramolecular structures. Besides, the thermal decomposition mechanism of the complexes has been studied by TG/DSC-FTIR technology. The results show that these complexes are thermally stable up to 450 K. In addition, complexes 4 and 6 both exhibit the characteristic fluorescence of lanthanide ions, that is, complex 4 exhibits characteristic 4G5/2→6HJ/2 (J= 5, 7, 9) transitions, and complex 6 shows characteristic 4F9/2→6HJ/2 (J= 15, 13) transitions.