Abstract
Three new luminescent metal-organic frameworks (MOFs), {[Zn(L)(H2O)]·2H2O}n (1), {[Pb(L)]·0.5DMA}n (2), and {[Cd2(L)2(H2O)2]·2H2O}n (3) were synthesized by an asymmetric N-containing 2-pyrimidin-5-yl-terephthalic acid (H2L) ligand with Zn2+, Pb2+, and Cd2+ ions, respectively. In these complexes, L2− ligand exhibits the multiple coordination modes with metal ions to form different new structures; especially there exist the different secondary building units (SBUs) in 2 and 3. The solid-state luminescent properties of complexes 1-3 were studied at room temperature and the mechanism was analyzed carefully. In particular, complex 2 has good stability in aqueous solution and exhibits the specific selectivity and sensitivity to probe Fe3+, MnO4−, CrO42− and Cr2O72− simultaneously, and the detection limits of Fe3+ and Cr2O72− ions are 5.6 × 10−5 and 10−6, respectively. These are lower than those of other reported sensors. Finally, its quenching mechanism has also been studied in detail.
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