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固态配位聚合物{[Ag_2(bpp)_2(H_2O)_2](chd)·9H_2O}_n中之新颖“三叉星”笼状(H_2O)_5水簇的发现

Observation of the novel “three-pointed star” cage-like(H_2O)_5 cluster in a polymeric solid {[Ag_2(bpp)_2(H_2O)_2](chd)·9H_2O}_n
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摘要 固态配位聚合物{[Ag2(bpp)2(H2O)2](chd).9H2O}n(1)(bpp=1,3-二(4-吡啶基)丙烷、H2chd=1,4-环己烷二羧酸)是通过溶液相超声波合成技术获得的,建立在X射线结构分析技术基础上的结构(单斜晶系C2/c空间群,Z=4;晶胞参数a=30.37(2)?,b=9.271(5)?,c=18.89(1)?;β=128.47o;V=4164(4)?3)展现出该化合物捕捉了一条有趣的、由"三叉星"笼状五聚体及D2h构型四聚体水簇交替构成的一维水带,该化合物之所以新奇在于其代表了被认为是不太稳定的笼状水五聚体团簇的晶体学范例.第一性原理的密度涵理论(DFT)计算表明,笼状五聚体及D2h构型四聚体水簇的相互连接对于此类欠稳定水簇的稳定性是有益的. Coordination polymeric solid,{[Ag2(bpp)2(H2O)2](chd).9H2O}n(1)(bpp = 1,3-bis(4-pyridyl) propane,H2chd = 1,4-cyclo-hexanedicarboxylic acid),has been obtained by the solution phase ultrasonic synthesis techniques.The structure established through X-ray structural analysis shows that the compound traps an interesting 1D water tape built by the alternating "three-pointed star" cage-like pentameric and D2h tetrameric clusters(C2/c,Z = 4;a = 30.37(2) ?,b = 9.271(5) ?,and c = 18.89(1) ?;β = 128.47°;V = 4164(4) ?3).The novelty of the present complex is the rarely crystallographic example of the cage-shaped water pentamer,which is usually ascribed to a less-stable species.A first-principle density functional theory(DFT) calculation demonstrates that the interconnectivity between cage-like pentamers and D2h tetramers is beneficial for contribution to the structural stabilization of these less-stable water cluster species.
出处 《中国科学:化学》 CAS CSCD 北大核心 2012年第7期995-1006,1105-1106,共12页 SCIENTIA SINICA Chimica
基金 国家自然科学基金(50971063) 福建省自然科学基金(2003F006 2010J01042和2011J01047) 教育部留学回国人员基金项目的资助 华侨大学科研启动基金(10BS210)的支持
关键词 水簇 水五聚体 笼状 主体 DFT water cluster; water pentamer; cage-like; host; DFT
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