1. Tuning different kinds of entangled metal–organic frameworks by modifying the spacer group of aliphatic dicarboxylate ligands and the reactant ratio.
- Author
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Yang, Jin-Xia, Zhai, Ji-Quan, Zhang, Xin, Qin, Ye-Yan, and Yao, Yuan-Gen
- Subjects
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METAL-organic frameworks , *CARBOXYLATES , *LIGANDS (Chemistry) , *COORDINATION polymers , *BIOCHEMICAL substrates , *CONFORMATIONAL analysis - Abstract
Taking advantage of the conformational flexibility of the bpp ligand and aliphatic dicarboxylic acids, six interesting entangled coordination polymers, {[Cd(fum)(bpp)(H2O)]·(H2O)}n (1), {[Cd(fum)(bpp)2]·(H2O)5}n (2), {[Cd2(suc)1.5(bpp)2(NO3)(H2O)2]·6H2O}n (3), {[Cd(suc)(bpp)2]·(H2O)1.5}n (4), {[Cd2(glu)2(bpp)3]·10H2O}n (5), and {Cd(adp)(bpp)(H2O)}n (6) have been prepared and structurally characterized (bpp = 1,3-bi(4-pyridyl)propane, fum = fumaric, suc = succinate, glu = glutaric, adp = adipic). Compounds 1 and 2 are comprised of undulated 2D 44-sql networks. In the structure of compound 1, two identical undulated layers are parallelly interpenetrated with each other to give a 2D → 2D interpenetrating framework. For 2, the dangling arms projected from 2D layers are intercalated into the neighboring sheets, producing a 2D → 3D polythreading framework. Compound 3 shows a rare example of a 2D self-penetrating framework with a (3,4)-connected (42·63·8)(42·6) topology. Compound 4 presents an unusual 2D self-threading network with a novel 4-connected {42·63·8} topology. Compound 5 displays a 3D self-penetrating system based on a 2D → 3D parallel polycatenation array. Compound 6 exhibits an unprecedented 3D self-penetrating structure having both 1D + 1D → 1D polycatenation and 3D + 3D → 3D interpenetration characteristics. A comparison of these six compounds demonstrates that both the different spacer lengths of the aliphatic dicarboxylates and reactant ratios appear to play a significant role in the assembly of entangled frameworks. In addition, thermal stabilities and photoluminescence properties of 1–6 have been examined in the solid state at room temperature. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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