Organic−Inorganic Hybrid Aligned by the Ligand−Ligand Hydrogen Bonds by Using Pyridyl-Substituted Oxalamides as the Building Blocks

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• 作者：Qingdao Zeng ; Min Li ; Dongxia Wu ; Shengbin Lei ; Caiming Liu ; Lingyu Piao ; Yanlian Yang ; Shiyan An ; Chen Wang
• 刊名：Crystal Growth & Design
• 出版年：2008
• 出版时间：March 2008
• 年：2008
• 卷：8
• 期：3
• 页码：869 - 876
• 全文大小：2126K
• 年卷期：v.8,no.3(March 2008)
• ISSN：1528-7505

文摘

Pyridyl-substituted oxalamides, L¹ (4-pyCH₂NHCOCONHCH₂py-4), L² (3-pyCH₂NHCOCONHCH₂py-3), and L³ (2-pyCH₂NHCOCONHCH₂py-2), with HgI₂ and/or CuBr₂, form three new supramolecular complexes, [Hg₃L¹I₆]_∞ (1), {[Cu₂(L²)₄Br₂]·Br₂·4H₂O}_∞ (2), and [Hg(L³)₂I₂]_∞ (3), respectively. The complexes 1−3 are aligned by the oxalamide−oxalamide N−H···O hydrogen bonds between layers, and their crystal structures have been determined by single-crystal X-ray diffraction. Complex 1 forms a two-dimensional (2D) zigzag sheet architecture extending along the c-direction bridged by L¹ ligand and HgI₂. Complex 2 forms an interesting planar 2D (4,4) network with the uncoordinated Br⁻ anions and H₂O molecules located in the cavities. Complex 3 forms [2 + 2] metallomacrocycles, which are linked with the μ₂-bridged I atom and stacked together by intermolecular oxalamide−oxalamide hydrogen bonds and by edge-to-face π-stacking between the pyridyl rings to form the desired supramolecular tubular structure along the a-axis. After the removal of the solvent molecules, solid 2 exhibits a permanent porosity verified by a N₂ sorption isotherm with a N₂ uptake of approximately 1258 cm³/g (STP) and a Langmuir surface area of 2102 m²/g.