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Abstract: Four novel functional supramolecular metal–organic coordination polymers, [Cd2Cl3(IP)2(NIPH)2](1), [Zn2(IP)2(μ2-SO4)2(NIPH)2]·2H2O(2), [Cd(IP)2(BPDC)](3), [Zn2(IP)2(NDC)2](4) (IP=1-H-imidazo[4,5-f][1,10]-phenanthroline, H2NIPH=5-nitro-isophthalic acid, H2BPDC=4,4′-biphenyldicarboxylic acid, H2NDC=2,6-naphthalenedicarboxylic acid), have been obtained through three types of dicarboxylate linkers. All the four compounds are extended into a 3-D supramolecular framework by hydrogen bonds or weak aromatic interactions. The different structures demonstrate the effect of the dicarboxylate ligands on the formation of such coordination architectures. Compound 1 is a 1-D double-stranded loop-like chain with repeated [Cd4(Cl)4]4+ units connected by H2NIPH ligands. In compound 2, there are two indie 1D zigzag chains jointed by sulfate anions with μ2-bridging mode. With different metal centers, compounds 1 and 2 hold different crystal structures. With different auxiliary dicarboxylate ligands, compounds 3 and 4 exhibit disparate 1D chains. The fluorescence property and thermal stability of all complexes are also investigated. [Copyright &y& Elsevier]

Two kinds of three-dimensional (3D) coordination frameworks from monometallic to heterometallic, including a charming 3D monometallic complex, namely, [Eu2(mpda)3(H2O)4]n (1) and the first series of novel 3D heterometallic 4d-4f coordination frameworks based on 2,6-dimethylpyridine-3,5-dicarboxylic acid, namely, [Ln2Cd2(mpda)2(bdc)2(SO4)2(H2O)6]n [Ln=Sm(2), Eu(3), Gd(4), Tb(5), Dy(6); mpda=2,6-dimethylpyridine-3,5-dicarboxylic acid; bdc=1,4-benzenedicarboxylic acid] have been successfully synthesized under hydrothermal conditions and structurally characterized. Crystal 1 is featured by its interesting 3D chain-layer construction which is formed by the alternative arrangement of chains and layers and exhibits 2-nodal 5, 6-connected 3D network with the Schlafli symbol of {33.43.55.64}{36.46.53}. Complexes 2-6 are isostructural and it reveals that these 3D heterometallic compounds are firstly built by H2mpda ligand. What is worth mentioning is that anionic ligand SO42− plays a crucial function in the construction building. The two-dimensional (2D) lanthanide-transition heterometallic bilayers [Ln2Cd2(mpda)2(bdc)2]n are pillared by SO42− subunits forming mixed-ligand complexes with a pillared-layer 3D structure. Complexes 2-6 feature 4-nodal 3, 4, 5, 6-connected 3D frameworks with {4.82}{4.84.10}{42.810.102.12}{42.88} topology. All the complexes are characterized by elemental analyses, FT-IR spectroscopy, Powder X-ray diffraction (PXRD) and thermogravimetric analyses (TGA). Furthermore, the luminescence properties of compounds 1, 3, and 5 and the magnetic properties of complexes 4 and 6 were also investigated in detail. [ABSTRACT FROM AUTHOR]