Hydrogen Bond-Directed Frameworks Based on 1,2,4,5-Benzene-Tetracarboxylate
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- 作者：Oscar Fabelo ; Laura Cañ ; adillas-Delgado ; Fernando S. Delgado ; Pablo Lorenzo-Luis ; M. Milagros Laz ; Miguel Julve ; and Catalina Ruiz-Pé ; rez
- 刊名：Crystal Growth & Design
- 出版年：2005
- 出版时间：May 2005
- 年：2005
- 卷：5
- 期：3
- 页码：1163 - 1167
- 全文大小：368K
- 年卷期：v.5,no.3(May 2005)
- ISSN：1528-7505
文摘
The deprotonated forms of 1,2,4,5-benzenetetracarboxylic acid H4bta can act not only as hydrogen-bond acceptors but also as hydrogen-bond donors, depending on the deprotonated carboxyl groups given differentsupramolecular adducts. A search of the Cambridge Structural Database (CSD) of cocrystal structures of H4btawith L = 4,4'-bpy or bpe has found three different adducts: [HL]2[H2bta], [H2L][H2bta], and [H2L][H3bta], wherecocrystal structures of [HL]2[H2bta] with L = 4,4'-bpy or bpe form similar supramolecular arrangements. Toinvestigate this similarity, two new organic salts of the formula {[H2-4,4'-bpy][H2bta]}·2H2O (1) and {[H2bpe][H3bta]2}·4H2O (2) have been characterized. In the 1:1 adduct 1, the molecular components are linked by hydrogenbonds of the N-H···O type creating chains. These chains are further linked by C-H···O type interactions (C-Hfrom the cation and O from the anion) creating a two-dimensional motif. Two types of centrosymmetric rings areevident in the sheets. The stacked sheets are held together via 
··· interactions to create a three-dimensionalnetwork. Two types of channels, one hydrophilic and the other hydrophobic, run parallel to the a-axis. Water moleculesare hydrogen bonded in the hydrophilic channels. The supramolecular structure in the 2:1 adduct 2 is due to hydrogenbonds of the O-H···O and N-H···O types that afford a railroad network along the a-axis. Two water molecules areheld in the railroad cavities by hydrogen bonds with carboxylate oxygen atoms. Adjacent railroad chains are linkedthrough hydrogen bonds involving water molecules, building a two-dimensional structure.
··· interactions to create a three-dimensionalnetwork. Two types of channels, one hydrophilic and the other hydrophobic, run parallel to the a-axis. Water moleculesare hydrogen bonded in the hydrophilic channels. The supramolecular structure in the 2:1 adduct 2 is due to hydrogenbonds of the O-H···O and N-H···O types that afford a railroad network along the a-axis. Two water molecules areheld in the railroad cavities by hydrogen bonds with carboxylate oxygen atoms. Adjacent railroad chains are linkedthrough hydrogen bonds involving water molecules, building a two-dimensional structure.