The effect of reaction conditions on the nature of cadmium 1,3,5-benzenetricarboxylate metal-organic frameworks |
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| Authors: | Andrew D Burrows Christopher G Frost Luke L Keenan Teresa L Savarese |
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| Institution: | a Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK
b CLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, UK |
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| Abstract: | The product from the reaction between Cd(NO3)2·4H2O and 1,3,5-benzenetricarboxylic acid (H3btc) in DMF at 95 °C depends on the reaction time, with Cd(Hbtc)(H2O)2] 1 and Cd(Hbtc)(DMF)2] 2 isolated after heating for 10 min, the latter after standing the solution for 1-2 weeks at room temperature. Cd3(btc)2(H2O)9]·4H2O 3 was isolated after heating for 1 h, whereas Cd12(btc)8(DMF)14(OH2)2]·1.5DMF 4 was isolated after heating for 2 days. Compounds 1 and 3 have been previously reported, whereas 2 and 4 are both new. Compound 2 adopts a two-dimensional sheet structure, with the coordinated DMF ligands projecting from both sides of the sheets, whereas 4 has a complex three-dimensional structure related to the fsc net. When the reaction was repeated in the presence of pyrazine (pyz), the product Cd(Hbtc)(pyz)(DMF)]·DMF 5 was isolated as a minor compound. Compound 5 has a two-dimensional structure, with Cd-Hbtc zig-zag chains linked into sheets through the pyrazine ligands. |
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| Keywords: | Metal-organic framework Coordination polymer Cadmium Benzenetricarboxylate X-ray structural analyses |
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