Abstract
Six heterometallic complexes {[Ln2(pydc)6Ca3(H2O)12]·mH2O}n (Ln = Tb (1), m = 16; Eu (2), m = 14; Sm (3), m = 16; H2pydc = pyridine-2,6-dicarboxylic acid) and [Ln2(pydc)6Ca2(H2O)10]·2Him·xH2O (Ln = Tb (4), x = 8; Eu (5), x = 6; Sm(6), x = 8; im = imidazole) have been hydrothermally synthesized and characterized by elemental analysis, IR, TG, XRD as well as single-crystal X-ray diffraction. Complexes 1–3 display three-dimensional network structure and can be simplified to a new topology, with the point symbol of {4·84·12}2{42.82.102}{8}2. Complexes 4–6 exhibit tetranuclear structures. The luminescence properties for the six complexes were determined using solid samples. They show characteristic emission spectra of lanthanide ions. The complexes 1–6 were compared in terms of emission intensity, fluorescence decay lifetime and quantum yield. The quantum yields Фtotal are 90.02 ± 10%, 81.05 ± 10%, 37.65 ± 10%, and 70.84 ± 10% for complexes 1 (Ca–Tb), 4 (Ca–Tb), 2 (Ca–Eu), and 5 (Ca–Eu), respectively. The effects of the structure of the complexes and the coordination of calcium ions on the luminescent properties of lanthanide complexes were also investigated.
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