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Synthesis and properties of novel cesium containing Lanthanide-organic framework

新規希土類配位高分子の合成と物性

南川 卓也 ; 小越 友里恵; 渡邉 雅之  

Nankawa, Takuya; Ogoshi, Yurie; Watanabe, Masayuki

福島での事故以来、セシウムを除去できるゼオライトなどの高秩序な細孔性物質の物性は注目されている。このような細孔性物質中のセシウムの取り込みや透過挙動は、細孔の形状やサイズによって決まると考えられるが、この関係性は証明されていない。そこでわれわれは、希土類元素のイオン半径変化を用いて細孔サイズを精密に制御できる配位高分子LnCs(ox)$$_{2}$$(Ln=La, Eu, Tb, Er, Yb, Lu)を新規に合成することに成功した。この高秩序でサイズ制御できる希土類配位高分子の細孔を利用して、セシウムの挙動変化と配位高分子のサイズ変化との関係を調べた。

Removal of cesium by porous materials from various environments has recently attracted much attention because of the Fukushima crisis. The behavior of cesium in the presence of porous materials, such as Cs uptake selectivity and permeability, may depend on the sizes of porous materials but the relationship is not revealed yet because controlling the pore sizes were difficult. On the other hand, Metal-organic framework (MOF) materials that have highly-ordered pore and the pores sizes of which can be controlled by selecting appropriate ligands and metals have been investigated in these two decades. We synthesized novel lanthanide-organic framework containing cesium ions with the formula of LnCs(ox)$$_{2}$$ (Ln = La, Eu, Tb, Er, Yb, Lu), the pore sizes of which can be precisely controlled by changing lanthanide ions, to investigate the relationship between Cs permeability and pore sizes.

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