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71.
The title compound ist the first example of an adduct between telluric acid and the twenty four membered ring anion of a cyclododecaphosphate. [C(NH2)3]12P12O36 · 12 Te(OH)6 · 24 H2O crystallizes trigonal (rhomboedral: R3) with Z = 3 and the unit-cell dimensions a = 15.854(9), c = 51.26(2) Å in the hexagonal setting. The crystal structure was solved by direct methods and refined to a final R value of 0.031. It is characterized by a succession of three different typs of alternating layers perpendicular to the c direction. This layers are connected only by hydrogen bonds. The individual layers are built up of A: P12O36 anions, guanidinium cations and water of crystallisation, B: hexagonal arranged Te(OH)6 groups and guanidinium cations and C: water of crystallization. 相似文献
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有机-无机自由基盐(DBTTF)6PMo12O40·2H2O的合成、性质和晶体结构 总被引:1,自引:0,他引:1
用电解法制备了有机-无机自由基盐(DBTTF)6PMo12O40·2H2O.用红外光谱、电子光谱和电子自旋共振谱进行了表征,测定了其磁化率、导电性和单晶的晶体结构,该晶体属三斜晶系,P1空间群,晶胞参数为a=1.378 7(7)nm,b=1.420 4(2)nm,c=1.570 2(2)nm,α=104.570(8)°,β=103.41(2)°,γ=95.80(2)°,V=2.853(2)nm3,Z=1,Dc=2.142 Mg·m-3,R=0.072 7. 相似文献
75.
To avoid changes in the original As species distribution in natural water after sampling, a method of immediate separation
of As(V) by anion exchange at the sampling site was developed. The procedure consists of two steps. The total concentration
of arsenic is determined in one part of the water sample acidified on site. Another part of the water samples is pressed through
a column filled with an anion exchanger. The As(III) species that is not redox-stable remains in the effluent of the sorbents
column and can be analyzed with conventional methods after stabilization by addition of conc. HNO3. As(V) is sorbed by the exchanger material. The As(V) concentration can be calculated as the difference between Assol and As(III), neglecting very low contents of methylated species.
Oxidation of Fe(II) by air followed by co-precipitation of arsenic with iron hydroxide was applied in field experiments to
minimize the As concentration in seepage and mining water. 相似文献
76.
以MoO42-部分取代Li3Fe2(PO4)3中的PO43-,研究表明:加入的MoO42-离子主要以固溶形式存在于Li3Fe2(PO4)3中,起到了显著改善其电化学性能的作用。其中,MoO42-掺杂浓度为0.3的样品表现出最佳的电化学性能,其在0.5C倍率下的首次放电容量为113.7 mAh·g-1,这一数值比未掺杂的提高了20.7%;经过60次循环充放电,容量保持率为94%。将放电倍率从0.5C逐步增大至5C,再降至初始的0.5C,并在每个倍率循环10次,这一材料的最终放电容量可达首次0.5C的95%。这些优异的性能应归因于MoO42-掺杂使材料的氧化还原能力增强,氧化还原电对的电势差减小,电池内部的电荷转移电阻减小,以及Li+扩散系数增加。 相似文献
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Graphene sheets were assembled on anion exchange resin (AER) microspheres based on the electrostatic interactions between graphene oxide and AER and subsequent chemical reduction. The prepared graphene‐coated AER microspheres were characterized by scanning electron microscopy, X‐ray diffraction, and Fourier transform infrared spectroscopy. They were then embedded in the bores of pipette tips to fabricate disposable electrodes for electrochemical sensing. The workability and performance of the novel electrodes were examined by analyzing the electrochemical behavior of the electrodes for the sensing of ascorbic acid, dopamine, uric acid, acetaminophen, aniline, and glucose by cyclic voltammetry and amperometry. The advantages of the electrodes include ease of fabrication, low cost, pronounced electrocatalytic activity, and rapid response. Thus, they hold great promise for a wide range of applications. 相似文献
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