Distinct structures of inorganic-organic supramolecular assemblies based on discrete metallocyclic complexes incorporating flexible imidazole ligands: Syntheses, crystal structures and properties

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• 作者：Li Yang ; Guanjun Chang ; Liang Luo ; Feng Ding ; Jingsong You
• 关键词：Discrete metallocyclic structure ; Flexible ; Imidazole ligand ; Supramolecular building blocks ; Secondary interaction
• 刊名：Inorganica Chimica Acta
• 出版年：2013
• 出版时间：1 September, 2013
• 年：2013
• 卷：406
• 期：Complete
• 页码：307-314
• 全文大小：2249 K

文摘

Three new interesting discrete dinuclear metallocyclic complexes, namely, {[Pd₂(1)₄](NO₃)₄¡¤2DMSO¡¤2H₂O}_n (4), [Pd₂(2)₂Br₄]_n (5), and {[Pd₂(3)₂Cl₄]¡¤4DMSO}_n (6) have been successfully synthesized by the reaction of flexible exo-bidentate imidazole-containing ligands 1,3-bis(imidazol-1-ylmethyl)benzene (1), 1,3-bis(imidazol-1-ylmethyl)-5-methylbenzene (2), and 2,6-bis(imidazol-1-ylmethyl)-4-tert-butylphenol (3) with corresponding palladium salts. All these complexes were characterized by NMR spectroscopy in combination with elemental analysis, powder X-ray diffraction (PXRD), single-crystal X-ray diffraction, and thermal gravimetric analysis (TGA), respectively. Though all three complexes involve the similar supramolecular building blocks [2+2] metallocyclic units, under the inducement effect of the organic ligands, compounds 4-6 exhibit delicate geometric diversification of the resulting high-dimensional inorganic-organic supramolecular assemblies (e.g., [4+2] lantern-like cage structure, 1D channel, and 2D undulating framework, respectively). Furthermore, these results demonstrate that the secondary interactions such as intermolecular ¦Ð?¦Ð stacking interactions and hydrogen bonds could play important roles in the aspect of linking low-dimensional entities into high-dimensional supramolecular frameworks.