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Structure and luminescence of extraframework TiCl_6~(2-) in Cs~+- containing zeolite LTA

机译:Extraframe TiCl_6〜(2-)在Cs〜+ - 含沸石LTA中的结构和发光

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摘要

Octahedral TiCl62- ions were introduced into zeolite LTA at extraframework positions by allowing TiCl4(g) to react with dehydrated Cs,Na-A. The structure of the product, Ti,Cl,Cs,Na-A, was determined by single-crystal crystallographic technique in the space group Pm3m (a=12.228(1) angstrom) and refined to the error index R-1=0.046. Its composition was confirmed by energy-dispersive X-ray analysis. Octahedral TiCl62- ions center 8% of the large cavities. The TiCl62- ion is stabilized by eight surrounding Cs+ ions to form a Cs8TiCl66+ cluster. Each of these Cl- ions bonds further to an 8-ring Cs+ ion. These 8-ring Cs+ ions bridge between TiCl62- ions of adjacent unit cells to form a Cs11TiCl69+ continuum in the surface volume of the crystal. The X-ray induced luminescence spectrum of the product is a broad band from 360 to 700nm, peaking at 475nm. The emission is red-shifted and less intense than those of M,Cl,Cs,Na-A, M=Zr and Hf, but appears to occur by the same self-trapped exciton (STE) mechanism.
机译:通过允许TiCl4(g)与脱水Cs,Na-A反应,在预曲调位置将八面体TiCl62导入沸石LTA中。通过空间组PM3M中的单晶晶技术(A = 12.228(1)埃)中的单晶晶技术确定产品,Ti,Cl,Cs,Na-A的结构,并将其精制到误差指数R-1 = 0.046。通过能量分散X射线分析证实了其组合物。八面体TiCl62-离子中心8%的大腔。将TiCl62离子稳定在八个周围的CS +离子中以形成CS8TIC166 +簇。这些环中的每一个进一步键入8环CS +离子。这些8环CS +离子在相邻单元电池的TiCl62之间的桥梁,在晶体的表面积中形成CS11TICL69 +连续体。产物的X射线诱导的发光光谱是360至700nm的宽带,在475nm处达到峰值。排放是红移且比m,cl,cs,Na-a,m = zr和hf的强烈的强烈,但似乎由相同的自捕获子(ste)机制发生。

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