Through use of an irregular pentacarboxylate ligand, 2,2′-(pyridine-2,6diyl)diterephthalic acid (H 4 L), two Cu(II)-based metal−organic frameworks, {[(Me 2 NH 2 ) 0.5 ][Cu 0.75 (L) 0.5 (DMA) 0.375 ]•H 2 O} n (1) and {[Cu 4, have been synthesized. A structural analysis demonstrates that 1 is a 2D layer and 2 shows a 3D framework, which exhibit hopeful possibilities for the selective separations of C 2 H 2 /CH 4 and CO 2 /CH 4 . To enhance the adsorption properties, 5amino-1H-tetrazole (HAT) has been introduced in the synthesis system, and a new framework, {[Cu 4 (L) 2 (ATZ) 2 (H 2 O)]•5DMF•5H 2 O} n (3), has been obtained. 3 is a 3D framework. Especially, 3 is constructed from multiple SBUs and displays an unusual (3,4,6)-connected topology. Furthermore, especially 3 performs better than 1 and 2 in terms of uptake capacity as well as adsorption selectivity, which might be ascribed to the more proper pore space of 3.
The syntheses, crystal structures and magnetic properties are described for two novel 2D heterometallic Cu(II)-Sr(II) coordination polymers {Sr(H(2)O)(6)[(Im)(4)Cu(4)(pdc)(4)Sr(H(2)O)(4)]·6H(2)O}(n) (1) and [Cu(2)(H(2)O)(2)(pdc)(2)Sr(H(2)O)(3)](n) (2) (H(3)pdc = 3,5-pyrazoledicarboxylic acid; Im = imidazole). The 1 : 1 : 1 : 5 reaction of SrCl(2)·6H(2)O, Cu(NO(3))(2)·3H(2)O, H(3)pdc and imidazole in H(2)O-EtOH at 120 °C under autogenous pressure gave 1. Complex 2 was obtained from the 1 : 1 : 1 H(3)pdc/Sr(OH)(2)·8H(2)O/Cu(NO(3))(2)·3H(2)O reaction mixture in H(2)O-EtOH under solvothermal conditions. Complex 1 can be described as a 2D grid-shaped network with the four Cu(II) ions in a saddle-like conformation. In complex 2, Sr(II) ions link metalloligands [Cu(2)(pdc)(2)(H(2)O)(2)](2-) to generate a 2D layer framework. Variable-temperature solid-state dc magnetic susceptibility studies have been performed in the temperature range 2.0-300 K for complexes 1 and 2. Antiferromagnetic Cu(II)···Cu(II) exchange interactions were found for both 1 and 2.
Two porous complexes, namely, {[H2N(Me)2]2[Zn5(L)2(OH)2]·3DMF·4H2O}n (1), {[H2N(Me)2]4[Cu3(L)2(H2O)2]·4DMF·3H2O}n (2) were solvothermally constructed based on a symmetrical V-shaped rigid multicarboxylic acid ligand H5L (H5L= 3,5-di(2′,5′-dicarboxylphenyl)benzoic acid). Complex 1 and 2 dislay 3D...
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