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本工作报道了一种含新型八核铀酰(U8)团簇单元([(UO2)8O4(μ3-OH)2(μ2-OH)2]4+)的草酸铀酰配合物,该化合物中,U型有机配体链可以增强铀酰之间的交联度,具有稳定多核铀酰团簇的作用.通过与另外两种含单核和双核的铀酰配位化合物比较,发现八核铀酰团簇单元的形成是一个pH调控的过程.理化性质分析显示,荧光、红外、拉曼的信号峰都出现了不同程度的重叠和宽化,表明八个铀酰离子具有较高的相似度,这与此多核铀酰团簇的近平面分子构型密切相关.“,”In this work,we report a novel octa-nuclear uranyl (U8) motif [(UO2)8O4(μ3-OH)2(μ2-OH)2]4+ embedded in a uranyl-oxalate coordination polymer (compound 1) based on a U-shaped linker with extra-long xylylene chains for stabilizing the resulting high-nuclear motif through additional cross-linking connectivity.A comparison with dimeric and monomeric uranyl compounds obtained at different pH value from the same hydrothermal system reveals that,solution pH plays a vital role in formation of this octa-nuclear uranyl motif by promoting hydrolysis of uranyl source.Since high similarity of eight uranium centers in this nearly planar U8 motif here,overlapping and broadening of signals in fluorescence,infra-red (IR) and Raman spectra can be found.