Synthesis of substitutional solid solutions in Na2O-P2O5-In2O3-M 2 III O3 (MIII = Cr, Fe, and Mn) systems
摘要:
Solid solutions based on Na-7(InP2O7)(4)PO4 and Na3In2(PO4)(3), where chromium, iron, and manganese substitute for indium, have been prepared. When chromium and iron substitute for indium in Na-7(InP2O7)(4)PO4, a continuous solid solution series exists. When manganese substitutes for indium, it enters the compound in the oxidation state +3. The substitution of chromium for indium in Na3In2(PO4)(3) occurs within the range from 0.11 to 0.74 (mol/mol), and that of iron for indium, from 0.09 to 0.62 (mol/mol). When manganese substitutes for indium, it enters the structure of the crystalline phase in insignificant amounts as a two-charged cation.
Low-cost and high-power K<sub>4</sub>[Mn<sub>2</sub>Fe](PO<sub>4</sub>)<sub>2</sub>(P<sub>2</sub>O<sub>7</sub>) as a novel cathode with outstanding cyclability for K-ion batteries
A coumarin based highly selective fluorescent chemosensor for sequential recognition of Cu2+ and PPi
作者:Xianjiao Meng、Duanlin Cao、Zhiyong Hu、Xinghua Han、Zhichun Li、Dong Liang、Wenbing Ma
DOI:10.1016/j.tetlet.2018.10.048
日期:2018.12
coumarin based fluorescent chemosensor 1, in which tren and quinolone are introduced as receptors for sequential recognition of Cu2+ and PPi. The structure of chemosensor 1 was characterized by 1H NMR, 13C NMR and ESI-HR-MS. Sensor 1 showed an obvious “on-off” fluorescence quenching response toward Cu2+, and the quenching efficiency reached a maximum of 99.6% with the addition of 20 equiv. of Cu2+. The
在这项研究中,我们已经成功合成了一种新的基于香豆素的荧光化学传感器1,其中引入了tren和喹诺酮作为受体,用于顺序识别Cu 2+和PPi。化学传感器1的结构通过1 H NMR,13 C NMR和ESI-HR-MS进行表征。传感器1对Cu 2+表现出明显的“开-关”荧光猝灭响应,并且当添加20当量时,猝灭效率达到99.6%的最大值。的Cu 2+。的1 -Cu 2+复合物显示的“断-通”过许多竞争阴离子朝向的PPi的荧光增强的反应,尤其是HPO4 2-和H 2 PO 4 - 。传感器的检测限1为1.9×10 -6 M至铜2+和5.96×10 -8 M至的PPi。此外,传感器1表现出1:1结合化学计量到的Cu 2+和传感器1 -Cu 2+显示出2:CH 1结合化学计量到的PPi 3 CN / HEPES缓冲介质(9:1 V / V,PH = 7.4)。传感器1到Cu 2+和1- Cu 2+到PPi的稳定pH范围是4到8。
Highly selective colorimetric sensing pyrophosphate in water by a NBD-phenoxo-bridged dinuclear Zn(ii) complex
作者:Shengjun Yang、Guoqiang Feng、Nicholas H. Williams
DOI:10.1039/c2ob25617g
日期:——
A novel NBD-phenoxo-bridged dinuclear Zn(II) complex is found to be an effective colorimetric sensor for pyrophosphate (PPi) in pure aqueous solution over a wide pH range. This sensor shows high binding affinity (Ka ≈ 3 × 108 M−1) and high selectivity for PPi, and can be also used to assay the activity of pyrophosphatase in real time.
作者:Jie Ling、Jie Qiu、Ginger E. Sigmon、Matthew Ward、Jennifer E. S. Szymanowski、Peter C. Burns
DOI:10.1021/ja1048219
日期:2010.9.29
sheets that occur in extended structures. Where a bidentate peroxide group bridges uranyl bipyramids, the configuration is inherently bent, fostering formation of cage clusters. Here the bent configurations of four- and five-membered rings of uranyl peroxide hexagonal bipyramids are bridged by pyrophosphate or methylenediphosphonate, creating eight chemically complex cage clusters with specific topologies
diffraction and the phase purity has been evaluated by Rietveld refinement from high resolution synchrotron powder X-ray diffraction data. Both methods establish the accuracy of P42/mnm space group and synthesis of so called beta2-polymorph. Room temperature 57Fe Mössbauer spectroscopic studies confirm 3+ oxidation state of the compound. The electrochemical properties have been investigated with respect to
已在温和的水热条件下合成了Na 3 Fe 2(PO 4)2 F 3。Na 3 Fe 2(PO 4)2 F 3的结构已使用单晶X射线衍射进行了解析,并通过Rietveld精制从高分辨率同步加速器粉末X射线衍射数据中评估了相纯度。这两种方法建立的精度P 4 2 / MNM空间群和所谓的合成的β 2 -polymorph。室温57FeMössbauer光谱学研究证实了该化合物的3+氧化态。已经针对锂和钠离子电池研究了电化学性能。恒电流充放电研究表明,相对于锂和钠中的Li + / Li和Na + / Na平均电压为2.82和2.42 V,每个Fe最多可插入〜0.6个锂离子和仅〜0.4个钠离子离子电池。循环寿命研究表明,锂离子电池在长周期内显示出非常稳定的容量保持率,而Na离子电池在C / 5速率下经过约35个循环后往往会失去容量。