| Abstrakt: |
Five novel isostructural two-dimensional lanthanide complexes [Ln2(μ3-L)2(μ4-L)(H2O)3]n·nH2O, (Ln = Eu (1), Gd (2), Tb (3), Dy (4), Ho (5); H2L = 5-(pyridin-3-yloxy)isophthalic acid) have been hydrothermally synthesized. They are characterized by IR spectroscopy, X-ray diffraction and thermogravimetric analyses. Complexes 1–5 crystallize in the monoclinic space group P21/c and display a 2D layered structure. They have good thermal stability, and the skeleton structure can be maintained up to 500 °C. The solid-state fluorescence of complexes 1 and 3 shows the strong characteristic red luminescence of Eu(III) and the green luminescence of Tb(III) respectively, and they exhibit a fluorescence quenching effect on addition of acetone in aqueous solution. The detection limits are 3.59 × 10−4 M and 2.08 × 10−6 M, respectively. Moreover, complex 3 also exhibits fluorescence quenching effects on Fe3+ and CrO2− in aqueous solution with detection limits of 4.81 × 10−8 M and 4.06 × 10−8 M, respectively, which are lower than those of most reported complexes. Therefore, complex 3 is a multifunctional visual fluorescent probe in aqueous solution. [ABSTRACT FROM AUTHOR] |
