3D Coordination Networks Based on Supramolecular Chains as Building Units: Synthesis and Crystal Structures of Two Silver(I) Pyridyldiethynides

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• 作者：Tianle Zhang ; Jianxi Kong ; Yuejie Hu ; Xianggao Meng ; Hongbing Yin ; Dongshuang Hu ; Changpeng Ji
• 刊名：Inorganic Chemistry
• 出版年：2008
• 出版时间：April 21, 2008
• 年：2008
• 卷：47
• 期：8
• 页码：3144 - 3149
• 全文大小：4208K
• 年卷期：v.47,no.8(April 21, 2008)
• ISSN：1520-510X

文摘

Two silver(I) pyridyldiethynides, [Ag₂(3,5-C₂PyC₂)·4CF₃CO₂Ag·4H₂O] (A) and [Ag₂(3,5-C₂PyC₂)·3AgNO₃·H₂O] (B), were synthesized by reactions of 3,5-diethynylpyridine with silver trifluoroacetate and silver nitrate in high yield, respectively. X-ray crystallographic studies revealed that in A pyridyldiethynide groups connect Ag₁₁ cluster units to generate 1D supramolecular chains as bridging ligands, where each ethynide group interacts with four silver atoms. These supramolecular chains bearing pyridyl groups are linked by silver ions to form wavelike layers, which are further connected by trifluoroacetate ligands to afford a 3D coordination network. However, B exhibits a different structural feature, where two ethynide groups in one pyridyldiethynide ligand coordinate to three and four silver atoms, respectively. These silver ethynide cluster units are linked through silver-ethynide and argentophilic interactions, leading to a double silver chain by sharing silver atoms in these units. In B, the silver double chains are further connected by bridging pyridyldiethynide groups to generate 2D networks, which interact through the Ag−N coordination bonds between silver atoms and pyridyl groups in the adjacent layers to generate a 3D coordination network. In these two compounds, trifluoroacetate and nitrate groups exhibit different bonding modes, indicating that the counterion is an important factor influencing the structures of supramolecular chains and coordination networks.