| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1336258 | Polyhedron | 2016 | 7 Pages |
Two unprecedented Ln-based metal–organic frameworks (MOFs) based on 5-nitroisophthalic acid (H2L) and 2,4,5-tri(4-pyridyl)-imidazole (Htpim), namely {[H3tpim][Ln2(L)4(H2O)]}n [Ln = La (I), Nd (II)], were prepared by solvothermal reactions and characterized by IR, elemental analysis and X-ray diffraction analysis. X-ray single crystal diffraction indicates that complexes I and II display similar 2D 44 frameworks with similar tetranuclear [Ln4(COO)16(H2O)2] secondary building units due to the effect of Ln contraction and the same coordination modes of L ligands as well as the template effect of Htpim. Moreover, thermal stabilities and luminescent properties of I and II were also investigated.
Graphical abstractTwo Ln-based MOFs have been successfully constructed by 5-nitroisophthalic acid (H2L) and 2,4,5-tri(4-pyridyl)-imidazole (Htpim) and structurally characterized by IR, elemental analysis and X-ray diffraction analysis. Complexes I and II display similar 2D 44 frameworks with similar tetranuclear [Ln4(COO)16(H2O)2] SBUs due to the effect of Ln contraction and the same coordination modes of L ligands as well as the template effect of Htpim. Moreover, thermal stabilities and luminescent properties of I and II were also investigated. They are stable up to 177 °C and 190 °C, respectively. Their emissions mainly originate from ligand-based luminescence, corresponding shifts originated from LMCT.Figure optionsDownload full-size imageDownload as PowerPoint slide
