1. Efficient X-ray scintillating lead(ii)-based MOFs derived from rigid luminescent naphthalene motifs.
- Author
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Lu, Jian, Xin, Xue-Huan, Lin, Yang-Jie, Wang, Shuai-Hua, Xu, Jian-Gang, Zheng, Fa-Kun, and Guo, Guo-Cong
- Subjects
METAL-organic frameworks ,CRYSTAL structure ,X-ray diffraction - Abstract
Solid-state X-ray scintillators are widely applied in medical imaging and space exploration. However, it is still a great challenge to probe into the intrinsic nature of scintillating behaviour due to the ambiguous structure–function relationship. Herein, four structure-defined X-ray scintillating Pb(ii)-based metal–organic frameworks (SMOFs) were successfully obtained under solvothermal conditions, [Pb(1,4-ndc)(DMF)]
n (SMOF-1), [Pb(1,4-ndc)(DMA)]n (SMOF-2), [Pb2 (2,6-ndc)2 (H2 O)]n ·nDMF (SMOF-3) and [Pb4 (2,6-ndc)3 Cl2 ]n (SMOF-4), where 1,4-H2 ndc = 1,4-naphthalene dicarboxylate, 2,6-H2 ndc = 2,6-naphthalene dicarboxylate, DMF = N,N-dimethylformamide, and DMA = N,N-dimethylacetamide. SMOFs 1–4 show scintillating signals under X-rays triggered by a highly purified tungsten target. Compared with SMOFs 1–3, SMOF-4 exhibits excellent scintillating performance owing to its solvent-free and denser structure, which favours more efficient conversion ability of X-rays to visible light. X-ray stimulated luminescence (XSL) spectra present multiple emission peaks, which is further confirmed by wavelength-dependent luminescence spectra under UV-Vis light, and density of state and DFT calculations. The synergistic effects of heavy metal Pb(ii) centres as effective X-ray absorbers and organic ligands as luminescent motifs endow these Pb(ii)-based MOFs with application prospects in X-ray detection. [ABSTRACT FROM AUTHOR]- Published
- 2019
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