| 摘要: | 本篇論文利用高溫高壓水熱合成法合成一個六價鈾氧氫氧化物K5[U5O17(OH)] ( A1)及六價鈾磷酸鹽化合物K4[(UO2)3O2(PO4)2] (A2)，利用單晶X光繞射儀鑑定出化合物的晶體結構，以粉末X光繞射儀得知樣品的純度，再以X光能量散佈分析、UV-vis吸收光譜分析、EPMA元素分析等方式來做定性與定量的分析。
化合物A1為六價鈾氧氫氧化物，屬於單斜晶系(Monoclinic)，空間群為P21/m(No. 11)，結構利用兩種不同配位數的六價鈾氧單元UO6與UO7以共邊方式形成的五聚體單元串聯成長鏈，再利用共點的方式並聯形成二維的鈾氧多面體層，金屬離子K+則散布在曾與層之間和兩個不同層的氧連結。
化合物A2為六價鈾磷酸鹽化合物，屬於單斜晶系(Monoclinic)，空間群為P21/c(No. 14)。結構利用兩種不同配位數的六價鈾氧多面體UO8與UO7共邊方式形成二聚單元體串聯成長鏈，PO4四面體以並聯方式連接每一個長鏈並形成二維的層狀結構。金屬離子K+則散布在曾與層之間和兩個不同層的氧連結。
;A uranyl(VI) oxyhydrate K5[U5O17(OH)] ( A1) , and a uranyl (VI) phosphate K4[(UO2)3O2(PO4)2] (A2) , were synthesized under hydrothermal condition at 600 OC and 1650 atm , and structurally characterized by powder and single X-ray diffraction , these compounds were further characterized by EDS , EPMA , and UV-vis spectroscopy.
Compound A1 monoclinic , P21/m(No. 11), a = 6.985(1) Å, b = 19.992(5) Å, c = 7.002(1) Å, β= 109.84°,V=919.80 Å3, Z=2, R1=0.0298, A1is a uranyl oxyhydroxide , The structure contains UO6 tetragonal bipyramids and UO7 pentagonal bipyramids to form thick layers. The K+ cations are located between the layers. The sheet anion topology, which is closely the same to that of the Na+ compound, contains chains of edge-sharing pentagons as well as dimers of corner-sharing squares.
Compound A2 monoclinic , P21/c(No. 14), a = 6.7323(4) Å, b = 16.8465(1) Å, c = 7.0415(4) Å, β= 99.250(2)°,V=788.23(8) Å3, Z=2, R1=0.0277, A2 is a uranyl phosphate, contain dimers of edge
-sharing UO7 pentagonal bipyramids, UO8 hexagonal bipyramids and PO4 tetrahedrals to form sheets , the sheets of uranyl phosphates which are separated by K+ cations . |
