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Two new three-dimensional metal–organic frameworks, [H2N(CH3)2]2[Zn(btec)]·DMF (1, H4btec=1,2,4,5-benzenetetracarboxylate acid) and [H2N(CH3)2][ZnLi(btec)]·DMF (2), have been solvothermally synthesized and structurally characterized by single crystal X-ray diffraction. Compound 1 based on μ4-btec features an anionic homometallic framework with 4-connected pts topology. Compound 2 is a heterometallic organic framework with rare (4, 4, 8)-connected network topology, which can be considered as constitute of a Li-btec (pts) net and a Zn-btec net. Moreover, the luminescent properties of two compounds are investigated in the solid state at room temperature. [ABSTRACT FROM AUTHOR]

Abstract: Two new Cd coordination polymers, [Cd(5-Nisp)(e-urea)]n (1), and [Cd2(5-Hisp)2(e-urea)2(en)]n (2), (where 5-Nisp=5-nitroisophthalate; 5-Hisp=5-hydroxyisophthalate; e-urea=ethyleneurea; en=1,2-ethanediamine), have been urothermally synthesized by using ethyleneurea hemihydrate as the solvent. Single-crystal X-ray diffraction analyses reveal that both 1 and 2 have linear chain sub-structures linked by 5-Nisp ligands or 5-Hisp ligands into three-dimensional frameworks. The thermogravimetric behavior and the photoluminescent properties of 1 and 2 were studied. [Copyright &y& Elsevier]

Based on linear 1,4-benzeneditetrazol-5-yl ligand, two Cd(II) metal-organic frameworks have been constructed from square planar tetranuclear and linear trinuclear cadmium clusters, respectively, both of which show 8-connected bcu topology and luminescent properties. [ABSTRACT FROM AUTHOR]