A first amine-templated uranyl selenate based upon highly porous uranyl selenate nanotubules, (C4H12N)14[(UO2)10(SeO4)17(H2O)], has been prepared in the room-temperature reaction of uranyl nitrate, butylamine, and H2SeO4 in aqueous solution. The structure consists of nanometer-scale tubular [(UO2)10(SeO4)17(H2O)]14- units packed in a hexagonal-type fashion. The tubules have elliptical cross section with outer dimensions of 25 x 23 A = 2.5 x 2.3 nm. The internal free crystallographic diameter of the tubules is 12.6 A = 1.26 nm, which is comparable to the effective pore size in large-pore zeolites. This finding demonstrates the possibility of nanostructures for actinides in higher oxidation states and opens up a new area of research and exploration.
An inorganic oxo salt, K5[(UO2)3(SeO4)5](NO3)(H2O)3.5, forms a structure based on nanoscale uranyl selenate tubules (see picture; • {UO78−} bipyramids, ○ {SeO42−} tetrahedra). The interiors of the nanotubules are occupied by K+ ions and H2O molecules.
Das anorganisches Oxosalz K5[(UO2)3(SeO4)5](NO3)(H2O)3.5 bildet eine Struktur aus nanometergroßen Uranylselenat‐Röhrchen (siehe Bild; • {UO78−}‐Bipyramiden, ○ {SeO42−}‐Tetraeder). Im Innern der Nanoröhren befinden sich K+‐Ionen und H2O‐Moleküle.
Uranium I 5900Highly Porous Uranyl Selenate Nanotubules. -Yellow transparent crystals of (Bu-NH3)14[(UO2)10(SeO4)17(H2O)] are synthesized by slow evaporation of aqueous solutions of butylamine, H2SeO4, and UO2(NO3)2 (6-7 d, 90% yield). As revealed by single crystal XRD, the compound crystallizes in the orthorhombic space group I2mm with Z = 4. The structure consists of nanometer-scale tubular [(UO2)10(SeO4)17(H2O)] 14units. The nanotubes consist of UO 7 pentagonal bipyramids and SeO 4 tetrahedra sharing common O atoms. One possible application of this material is the utilization of depleted U through its incorporation into nanomaterials for applications in nanotechnology. -(KRIVOVICHEV*, S. V.; KAHLENBERG, V.; TANANAEV, I. G.; KAINDL, R.; MERSDORF, E.; MYASOEDOV, B. F.; J.
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