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The reaction of Cd(NO_3)_2·4H_2O with 4,4?-dipyridylacetylene(4,4?-DPA) and 2-nitroterephthalic acid(2-NO_2-H_2BDC) in DMF/H_2O mixed solvent has afforded a compound {[Cd(2-NO_2-BDC)(4,4?-DPA)]·(DMF)}_n(1). Compound 1 has been characterized by single-crystal X-ray diffraction, powder X-ray diffraction, thermogravimetry analysis, and IR spectrum. Compound 1 crystallizes in the monoclinic system, space group P21/n, with a = 12.1488(3), b = 14.6689(3), c = 13.1615(3) ?, β = 111.809(3)o, V = 2177.63(9) ?~3, Z = 4, C_(23)H_(18)N_4O_7 Cd, M_r = 574.81, D_c = 1.753 g/cm~3, μ = 8.523 mm~(-1), F(000) = 1152, the final R = 0.0411 and wR = 0.1064 for 3589 observed reflections with I > 2s(I). In compound 1, the Cd(Ⅱ) ions are linked by the carboxylate groups of 2-NO_2-BDC ligands to give a two-dimensional layered structure based on the centrosymmetric dinuclear Cd_2(COO)_2 units, which are further connected by the 4,4?-DPA ligands to produce a three-dimensional framework with pcu topology. Careful examination revealed that compound 1 is a 2-fold interpenetrating framework. Furthermore, the gas adsorption properties of 1 for N_2 and CO_2 have also been investigated.
The reaction of Cd (NO_3) _2 · 4H_2O with 4,4? -dipyridylacetylene (4,4? -DPA) and 2-nitroterephthalic acid (2-NO_2-H_2BDC) in DMF / Compound 2 has been characterized by single-crystal X-ray diffraction, powder X-ray diffraction, thermogravimetry analysis, and IR spectrum. Compound 1 crystallizes in the monoclinic system, space group P21 / n, with a = 12.1488 (3), b = 14.6689 (3), c = 13.1615 (3) 2177.63 (9)? 3, Z = 4, C 23 H 18 N 4 O 7 Cd, M_r = 574.81, D_c = 1.753 g / cm 3, μ = 8.523 mm -1, = 1152, the final R = 0.0411 and wR = 0.1064 for 3589 observed reflections with I> 2s (I). In compound 1, the Cd (II) ions are linked by the carboxylate groups of 2-NO 2-BDC ligands to give a two-dimensional layered structure based on the centrosymmetric dinuclear Cd_2 (COO) _2 units, which are further connected by the 4,4? -DPA ligands to produce a three-dimensional framework with pcu topology. C areful examination revealed that compound 1 is a 2-fold interpenetrating framework. Further, the gas adsorption properties of 1 for N_2 and CO_2 have also been investigated.