Abstract
Two heterometallic [K4M4(HL)4(H2O)12] (M=Co (1), Ni (2)) and two homometallic [M2L(H2O)7] · 2H2O ((M=Co (3), Ni (4)) (H4L = (2-(bis(carboxymethyl)amino) terephthalic acid) have been synthesized and characterized by elemental analysis, FT-IR spectrum, and single-crystal X-ray diffraction. The isomorphous 1 and 2 contain K+ and M2+, in which K+ were bridged with M2+ through μ-HL3− and μ-H2O, leading to 2-D layer structures. The isomorphous 3 and 4 show homometallic binuclear complexes with μ-HL3− as the bridging ligand. Various H-bonds including different H-bond helical chains form, by which 3 and 4 assemble into 3-D supramolecular frameworks. TG analysis indicates that the decomposition temperatures are [K4M4(HL)4(H2O)12] (1) > [M2L(H2O)7] · 2H2O (3) > H4L.
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