National Changhua University of Education Institutional Repository : Item 987654321/18927
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题名: Argentophilic Interaction and Anionic Control of Supramolecular Structures in Simple Silver Pyridine Complexes
作者: Chen, Chih-Yuen;Zeng, Jing-Yao;Lee, Hon Man
贡献者: 化學系
日期: 2007-01
上传时间: 2014-08-14T04:29:10Z
出版者: Elsevier
摘要: The synthesis and characterization of three simple 1:2 silver(I) pyridine adducts of different counter-anions, [Ag(py)2]+ · X− (X = ClO4, 1; BF4, 2; PF6, 3), are reported. The structural studies for 1–3 reveal the presence of strong ligand-unsupported argentophilic interactions between [Ag(py)2]+ ions, forming pairs of . The Ag⋯Ag contact distances are 2.96–3.00 Å. In 1 and 2, pairs of are further linked into 1-D infinite chains by a combined set of multiple Ag⋯Ag close contacts (3.34–3.37 Å), offset ‘head to head’ π–π stacking, and anion bridging interactions. Such combined set of interactions is anion-dependant with 1 and 2 containing anions of tetrahedral geometry and , affording essentially the same supramolecular architecture. Metal–anion interactions are crucial in organizing the 1-D chains into 3-D networks. The ES-MS studies of 1 and 2 provide positive evidence for the aggregation of silver(I) ions in solution. In contrast, for 3 with the counter-anion of octahedral , pairs of are organized into a 3-D network via a combined set of Ag⋯F contacts, C(H)⋯F hydrogen bonds, and ‘head to tail’ π–π stacking interactions. No extended 1-D polymeric chains of silver ions are present in 3.
關聯: Inorganica Chimica Acta, 360(1): 21-30
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