Intercalation of KCl into layered neptunyl and plutonyl iodates |
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| Institution: | 1. Department of Physics, Motilal Vigyan Mahavidyalya College, Bhopal-462008;2. Condensed Matter Theory Group, School of Studies in Physics, Jiwaji University, Gwalior-474011 (MP), India;3. Department of Physics, Jamia Millia Islamia New Delhi-110025 India;4. Department of Physics NRI Institute of Research & Technology, Bhopal-462021 India;1. College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China;2. Regenerative Medicine Center, First Affiliated Hospital of Dalian Medical University, Dalian 116011, PR China;3. Center Laboratory, Affiliated Zhongshan Hospital of Dalian University, Dalian 116001, PR China;4. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, PR China |
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| Abstract: | The hydrothermal reaction of Np(IV) or Pu(IV) with KIO4 and CsCl at 180°C for 1 day results in the formation of NpO2(IO3)2·0.5KCl·3.25H2O (1) or PuO2(IO3)2·0.5KCl·2.5H2O (2). The neutral layers in compounds 1 and 2 are isostructural with NpO2(IO3)2·H2O and PuO2(IO3)2·H2O, respectively. The Np and Pu centers are found in distorted pentagonal bipyramidal AnO7] environments that are formed from the ligation of NpO22+ or PuO22+ cations by iodate anions. There are two crystallographically unique pyramidal iodate anions in 1 and 2. One of these anions utilizes all three oxygen atoms to simultaneously bridge three neptunyl or plutonyl units. The second anion only bridges two actinyl units and has a terminal oxo atom. The bridging of the actinyl cations by iodate anions creates neutral ∞2AnO2(IO3)3] (An=Np, Pu) sheets that are separated by K+ cations, Cl− anions, and water molecules. Crystallographic data (203 K, MoKα, λ=0.71073): 1, monoclinic, space group C2/c,a=21.537(5) Å, b=11.670(3) Å, c=7.315(2) Å, β=93.033(4)°, Z=4, R(F)=5.43% for 136 parameters with 1309 reflections with I>2σ(I); 2, monoclinic, space group C2/c, a=21.570(4) Å, b=11.656(2) Å, c=7.348(2) Å, β=94.00(3), Z=4, R(F)=4.92% for 148 parameters with 1317 reflections with I>2σ(I). |
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