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首页> 外文期刊>Crystal growth & design >Oxalate- and Squarate-Biimidazole Supramolecular Synthons: Hydrogen-Bonded Networks Based on [Co(H(2)biimidazole)(3)](3+)
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Oxalate- and Squarate-Biimidazole Supramolecular Synthons: Hydrogen-Bonded Networks Based on [Co(H(2)biimidazole)(3)](3+)

机译：草酸-和方酸-苯并咪唑超分子合成子：基于[Co（H（2）biimidazole）（3）]（3+）的氢键网络

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摘要

The utility of R-2(2)(9) biimidazole-carboxylate, R-2(2)(10) biimidazole-oxalate/squarate and R-2(2) (9) biimidazole-(tris-oxalate) synthons is considered for crystal engineering of hydrogen-bonded networks based on [Co-III(H(2)biim)(3)](3+) cations (H(2)biim = 2,2-biimidazole) and oxalate, squarate or [M-III(C2O4)(3-) anions. Syntheses and crystal structures are described for [Co-III(H(2)biim)(3)](3-) [M-III(C2O4)(3)]center dot 2H(2)O (M = Cr, 1; M = Co, 2), [Co-III(H(2)biim)(3)](HC4O4)(3)center dot 2H(2)O, 3, and [Co-III(H(2)biim)(3)](C2O4)Cl center dot 5.5H(2)O, 4. Compounds 1 and 2 are isostructural and comprise [Co(H(2)biim)(3)](3+) cations bridged by [M(oxalate)(3)](3-) anions in two directions and water molecules in the third direction to give a 3D H-bonded network. Both outer and inner 0 atoms of the coordinated oxalate ions act as H-bond acceptors, forming motifs closely related to the anticipated R-2(2)(9) biimidazole-(tris-oxalate) synthon. Compound 3 contains a more complex H-bond pattern in 3D, built from the intended R-2(2)(10) biimidazole-squarate synthon and additional H-bonds between protonated squarate molecules and water molecules. The structure of compound 4 (obtained with synchrotron radiation) contains layers in which stacked pairs of oxalate anions bridge between [Co-III(H(2)biim)(3)](3+) cations to form a dense 2D kgd-net, separated by layers of disordered chloride anions and H-bonded water molecules.
机译：考虑了R-2（2）（9）联咪唑羧酸酯，R-2（2）（10）联咪唑-草酸酯/方酸和R-2（2）（9）联咪唑-（三-草酸酯）合成子的效用用于基于[Co-III（H（2）biim）（3）]（3+）阳离子（H（2）biim = 2,2-biimidazole）和草酸盐，方酸或[M]的氢键网络的晶体工程-III（C2O4）（3-）阴离子[Co-III（H（2）biim）（3）]（3-）[M-III（C2O4）（3）]中心点2H（2）O（M = Cr，1 ; M = Co，2），[Co-III（H（2）biim）（3）]（HC4O4）（3）中心点2H（2）O，3和[Co-III（H（2）biim ）（3）]（C2O4）Cl中心点5.5H（2）O，4。化合物1和2是同构结构，并包含由[M]桥接的[Co（H（2）biim）（3）]（3+）阳离子（草酸酯）（3）]（3-）在两个方向上具有阴离子，在第三方向上具有水分子，从而形成3D H键合网络。草酸根离子的外部和内部0原子均充当H键受体，形成与预期的R-2（2）（9）联咪唑-（三草酸）合成子密切相关的基序。化合物3包含3D复杂的H键模式，该模式由预期的R-2（2）（10）联咪唑-方酸合成子和质子化的方酸分子与水分子之间的其他H键构成。化合物4的结构（通过同步加速器辐射获得）包含一些层，其中草酸根阴离子的成对叠置在[Co-III（H（2）biim）（3）]（3+）阳离子之间，形成致密的二维kgd-网，由无序的氯离子和氢键的水分子层隔开。

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