Hydrothermal synthesis and structure characterization of two six-connected metal–organic frameworks based on the mixed ligands

• Compound 1 presents a two-dimensional layers structure with point symbol of (36·46·53)-hxl topology.
• Compound 2 exhibits the 2-fold interpenetrating 3D structure.
• Compound 2 shows the point symbol of the (34·47·54)-pcu topology based on the hexanuclear zinc clusters as the six-connected node.
• Compound 2 shows fluorescence property in the solid state at room temperature.

Two metal–organic frameworks, namely, [Ni2(BIMB)2(ndd)2·H2O]n (1) and [Zn3(ndd)2.5(μ3-OH)(1,3-dpp)]n (2) (H2ndd = 2,2′-(naphthalene-1,5-diylbis(oxy))diacetic acid, BIMB = 1,4-bis[(1H-imidazol-1-ly)methyl]benzene, 1,3-dpp = 1,3-di(pyridin-4-yl)propane) have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction and thermogravimetric analysis. Compound 1 presents a two-dimensional network with point symbol of (36·46·53)-hxl topology. Moreover, compound 2 displays a novel 2-fold interpenetrated structure with the point symbol of (412·63)-pcu topology based on the hexanuclear [Zn6(CO2)10(N)4] unit as a six-connected node. Meanwhile, compound 2 shows good fluorescence property in the solid state at room temperature.

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