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The effect of reaction conditions on the nature of cadmium 1,3,5-benzenetricarboxylate metal–organic frameworks

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Title: The effect of reaction conditions on the nature of cadmium 1,3,5-benzenetricarboxylate metal–organic frameworks
Authors: Burrows, Andrew D.1 a.d.burrows@bath.ac.uk, Frost, Christopher G.1, Kandiah, Mathivathani1, Keenan, Luke L.1, Mahon, Mary F.1, Savarese, Teresa L.1, Warren, John E.2
Source: Inorganica Chimica Acta. Jan2011, Vol. 366 Issue 1, p303-309. 7p.
Subjects: Cadmium, Carboxylic acids, Benzene, Temperature effect, Ligands (Chemistry), Pyrazines, Coordination polymers
Abstract: 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 10min, the latter after standing the solution for 1–2weeks at room temperature. [Cd3(btc)2(H2O)9]·4H2O 3 was isolated after heating for 1h, whereas [Cd12(btc)8(DMF)14(OH2)2]·1.5DMF 4 was isolated after heating for 2days. 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. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract: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 10min, the latter after standing the solution for 1–2weeks at room temperature. [Cd3(btc)2(H2O)9]·4H2O 3 was isolated after heating for 1h, whereas [Cd12(btc)8(DMF)14(OH2)2]·1.5DMF 4 was isolated after heating for 2days. 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. [ABSTRACT FROM AUTHOR]
ISSN:00201693
DOI:10.1016/j.ica.2010.11.025