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室温固相反应制备Keggin结构杂多酸铵盐纳米粒子 总被引:19,自引:1,他引:18
纳米材料由于其量子尺寸效应及表面效应而在磁、光、电等方面显示出许多常规粒子所不具有的特性[1] .纳米材料成功应用的实例及潜在应用前景推动了各种纳米粉末的合成及合成方法的发展 [2~ 4 ] .利用低温固相反应制备纳米粒子尚不多见 ,但已有报道 [5,6] .多金属氧酸盐因其独特的结构而具有较高的催化活性、导电性、磁性、光电致变色性以及抗病毒活性 ,因而有着广阔的应用前景 ,这些方面的研究已越来越引起人们的兴趣 [7~ 10 ] .本文采用室温固相反应首次制备了多金属氧酸盐纳米粒子 (NH4 ) 3PMo12 O4 0 · 9H2 O(1 )和 (NH4 ) 3PW12… 相似文献
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Introduction The metal phosphates have attracted much attention because of their potential applications in catalysis, sorp-tion, and magnetic properties.1-5 A large number of metal phosphates6-10 with 1-D chain, 2-D layer and 3-D open-framework have been synthesized under mild hydrothermal conditions in the presence of organic amines. Chiral open-framework phosphates have been synthesized in the presence of chiral metal complexes and chiral structure-directing agents.11-15 In the past years,… 相似文献
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利用酯基锡与缺位Keggin结构杂多阴离子PW9O9-34反应,合成了6种新的杂多阴离子有机金属配合物M9[(R′OOCCHR″CH2SnOH2)3(PW9O34)2]·xH2O(M=(CH3)4N+,K+;R′=CH3_,CH3CH2_;R″=H,CH3_),通过元素分析、IR光谱、紫外电子光谱、1HNMR、31PNMP、183WNMR和TGA-DSC热分析等测试手段对标题配合物进行了表征和性质研究,确定该系列配合物为A-β-PW9型夹心配合物结构. 相似文献
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The electrochemical behavior of monomolybdenum-substituted Keggin-type polyoxometalates [XW11MoO40]^n- (X=P, Si, Ge with n=3, 4) was studied in aqueous and N,N-dimethylformamide (DMF) solution. These anionic clusters showed different electrochemical behaviors in two kinds of media. The initial potentials of [XW11MoO40]^n- in DMF were more negative than those in aqueous solution, showing a lower oxidation ability of [XW11MoO40]^n- in DMF. The investigation results suggested that the redox properties of polyoxometalates be tuned by the substitutions of Mo for W and by replacing aqueous solution with organic solvent, which provided valuable information to rationally choose polyoxometalates (POM) in preparation of POM-based organic/inorganic hybrid materials. 相似文献
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通过电化学还原的方法得到钼硅多酸的还原产物杂多蓝单晶H~8SiMo~12H~2O.测定了它的晶体结构.晶体空间群PI.a=1.3769(3)nm,b=1.4346(4)nm,c=1.4134(4)nm,a=120.47(2)°,β=110.70(2)°,γ=66.11(2)°;z=2,R=0.0608.确证杂多蓝阴离子呈现Keggin结构和与a-异构体特征,基本保持未还原杂多酸阴离子的结构.但是在结构畸变程度、键角和健长的变化以及结晶水的分布上 有明显不同.同时确定了杂多蓝阴离子结构中4个Mo^5+离子的位置. 相似文献