Abstract
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.
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