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Six new coordination compounds, namely [Co(H2bptc)]n(1), [Mn(H2bptc)]n(2), [Cd2(bptc)(phen)2(H2O)2]n(3), [Eu2(cpa)3(DMF)2]n(4), [Nd2(cpa)3(DMF)2]n(5) and [Pr2(cpa)3(DMF)2]n(6) (bptc4−= biphenyl-2,2′,4,4′-tetracarboxylate anion, phen =1,10-phenanthroline, cpa2−= 4-chloroisophthalic acid anion) were synthesized under hydrothermal conditions. Their structures have been determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectra, and thermogravimetric analysis. Co and Mn compounds are isostructural, and possess a three-dimensional 5, 5-connected network. In Cd compound, multicarboxylate ligand H4bptc link Cd centers to generate a two-dimensional 4, 4-cnet structure with phen acting as terminal ligand. Eu, Nd, and Pr compounds have similar structures, and cpa2−ligands link lanthanide cations to generate a two-dimensional sheet structure. Magnetic susceptibility measurements indicate that the Co compound has a dominating ferromagnetic coupling between Co(ii) ions, and Mn compound exhibits antiferromagnetic coupling between Mn(ii) ions. Furthermore, their luminescent properties are also determined in the solid state at room temperature. [ABSTRACT FROM AUTHOR]

Two new 3D frameworks [(WS4Cu6Br4)(timp)8/3(H2O)40/3]n(1) and [(WS4Cu6Br4) (timtz)8/3(H2O)40/3]n(2), containing heptanuclear cluster blocks (one W atom and six Cu atoms) bridged by trigonal ligands timp or timtz (timp = 1-(3,5-di (1H-imidazol-1-yl)phenyl)-1H-imidazole; timtz = 2,4,6-tri(1H-imidazol-1-yl)-1,3,5-triazine), were successfully synthesized. Both compounds were characterized by single-crystal X-ray diffraction, elemental analysis, XRD, IR, TGA. X-ray determination shows that 1and 2can be topologically represented as (3,4)-connected networks with α-C3N4(or ctn) topology where [WS4Cu6] act as the 4-connecting nodes, and the timp or timtz ligands bridge in pairs that act as the three-connecting nodes. Both compounds have the high symmetry of space group I-43d, which is the maximum symmetry for this net topology. The luminescent spectra and N2absorption behaviors for 1and 2have also been investigated. [ABSTRACT FROM AUTHOR]

The self-assembly of 3,5-pyrazoledicarboxylic acid (H3pdc) and metal salts under hydrothermal conditions leads to the formation of a series of novel NaI–CuII–LnIII heterometallic coordination polymers, {[Na(H2O)4]2[Cu(pdc)2Ln(H2O)5]2·3H2O}n [Ln = La (1); Sm (2); Pr (3); Nd (4) and pdc3− = 3,5-pyrazoledicarboxylate]. X-Ray structure analyses show that these complexes all exhibit pairs of infinite, unexpected, cationic and anionic chains. It is the first successful attempt to construct unprecedented NaI–CuII–LnIII heterometallic coordination polymers with both infinite cationic and anionic chains. These four complexes show homologous thermal stabilities. The different magnetic properties of 1–3 are also been reported in this paper. [ABSTRACT FROM AUTHOR]