单柱离子色谱法测定钼酸根和钨酸根离子的研究

本文采有单柱离子色谱系统测定了MoO_4~(2-)和WO_4~(2-)。以1.0mmol/L钼酸钠为淋洗液测定WO_4~(2-),以1.0mmol/L钨酸钠为淋洗液测定MoO_4~(2-),常见阴离子Cl~-、NO_3~-、SO_4~(2-)不干扰测定,MoO_4~(2-)和MO_4~(2-)的检出限分别为3.55μg/ml和5.03μg/ml,相对标准偏差为1.04％和1.66％,工作曲线的线性范围为3.55～1500μg/ml和5.03～1500μg/ml。应用于钼、钨、硅杂多酸中钼和钨的测定,结果满意。     

用异丙肾上腺素检定[Fe(CN)6]3-

将医用药物异丙肾上腺素引入分析化学作新显色剂,报道了异丙肾上腺素与[Fe(CN)6]3-进行显色反应的最佳条件、灵敏度、选择性和允许共存比.建立了微量的[Fe(CN)6]3-简便检定新方法,检出限为0.055μg,稀释限为14.5×106.     

离子色谱法测定除锈剂中钼酸根

通过单纯形优化法选择测定MoO2-4的最佳色谱条件,淋洗液组成为4.866mmol·L-1Na2CO3＋1.5mmol·L-1 NaOH。同时采用该分析方法测定除锈剂(磷化剂)中的MoO2-4,得到了良好的重现性和线性,样品的回收丰大于95％。     

异丙肾上腺素与MnO-4的显色反应

报道了新显色剂异丙肾上腺素与MnO-4进行显色反应的最佳条件、灵敏度、选择性和界限比.建立了微量MnO-4的简便检定新方法,检出限量为0.08μg,稀释限为1∶3.8×106.实验结果表明,在pH=9.91的缓冲溶液中,最大吸收波长483.6nm处,MnO-4浓度在1.0～5.0μg/10mL范围内服从比耳定律,表观摩尔吸光系数为 1.8×105.     

掺杂磷钼酸根离子聚吡咯膜电极对磷钼酸根离子电位响应的研究

用循环伏安法研究了制备掺杂磷钼根离子聚吡咯化学修饰电极的条件，对其性能进行了电化学表征，电极对磷钼酸根（ＰＭｏ１２Ｏ＾３－４０）离子具有选择性电位响应，线性范围为１．０×１０＾－６～１．０×１０＾－３ｍｏｌ／Ｌ。斜率约为５０ｍＶ，测定了电极的有关性能参数。电极可用于无机磷含量的检测。     

单柱离子色谱法测定砷酸根离子

砷是对人体有害的元素之一,对它的分析是环境监测中经常遇到的问题。原子吸收光谱法、电感偶合等离子体发射光谱法是测定砷的两种常用方法。     

双锰卟啉应用于钼酸根电位传感器的研究

以[MnT(p-CH3)PP]2O为活性物质、以o-NPOE为增塑剂PVC膜制成的新型高效电位型传感器来测定MoO42-离子浓度。该电极具有线性能斯特斜率为30.5的响应特征,其工作浓度范围为2.1×10-6~1.0×10-1mol/L,pH范围为5.0~12.5,响应时间不超过15 s,对常见干扰离子有较高的选择性,并被应用于实际样品中MoO42-含量的测定。     

抗肿瘤多酸药物[Mo7O24]6-的电子结构研究

运用第一原理密度泛涵理论中的离散变分方法（ＤＦＴ－ＤＶＭ）对具有抗肿瘤活性的多酸药物三合水七钼酸异丙基胺的阴离子「Ｍｏ７Ｏ２４」＾６－进行了电子结构，获得了键级、不等价原子的电子占据数、原子净电荷，分子轨道能级以及「Ｍｏ７Ｏ２４」＾６－的ＨＯＭＯ和ＬＵＭＯ组成等数据，并对该药物的活性和作用机理从电子结构的角度进行了讨论。     

Pressure-induced crystal–amorphous transformation in Y2Mo3O12

In this work we investigate the vibrational properties of anhydrous and hydrated yttrium molybdate as a function of hydrostatic pressure. An analysis of vibrational modes suggests that the anhydrous material experiences a phase transformation from orthorhombic to a lower symmetry phase (probably monoclinic) about 0.3 GPa, and to a highly disordered phase above 2.4 GPa. The structural transformation to the high-pressure disordered phase is not reversible and suggests the onset of a pressure-induced amorphization process. The vibrational mode dependence on pressure is discussed considering lattice dynamics calculations.     

Photoreductive self-assembly from [Mo7O24]6- to carboxylates-coordinated {Mo142} Mo-blue nanoring in the presence of carboxylic acids

The primary steps of the photoredox reaction between [Mo7O24]6- and carboxylic acid electron (and proton) donors in aqueous solutions are investigated by the chemically induced dynamic electron spin polarization (CIDEP) spectroscopy. The excitation of the O-->Mo ligand-to-metal charge-transfer (LMCT) bands of [Mo7O24]6- in the presence of CH3CO2H induces the emissive electron spin polarization (ESP) of *CH2CO2 and *CH3 radicals with an accompanying formation of the one-electron reduced species [Mo7O23(OH)]6-, which is demonstrated by the triplet mechanism involving the O --> Mo LMCT triplet states. The prolonged photolysis of the solution containing [Mo7O24]6- and CH3CO2H at pH = 3.4 leads to the formation of the acetate/propionate-coordinated {Mo142} Mo-blue nanoring, [MoV28MoV(I)114O429H10(H2O)(49)(CH3)CO2 triple bond Ac5(C2H5CO2 triple bond Pr)]30- (1a) through the formation of the cis-configured dimeric dehydrative condensation to two-electron reduced Mo-blue [(Mo7O23)2]10- ({Mo14}). 1a is isolated as a [NH4]+/[Me3NH]+-mixed salt which is formulated as [NH4]27[Me3NH]3[Mo(V)28Mo(VI)114O429H10(H2O)49(CH3CO2)5(C2H5CO2)].150 +/- 10H2O (1) by results of elementary analysis, single-crystal X-ray analysis, 1H NMR, IR, and UV/Vis measurements, and manganometric redox titration. Based on the building-block sequence of for 1a, the bottom-up processes from [Mo7O24]6- to the {Mo142} ring in the coexistence of beta-[Mo8O26]4- are discussed by (i) the stabilization of the molecular curvature of {Mo14} through both the intramolecular transfer of monomolybdates and the intermolecular transfer of monomolybdates as degradation fragments of beta-[Mo8O26]4-, to yield {Mo21} and {Mo20} building blocks, (ii) the outer-ring formation resulting from seven successive two-electron-photoreductive condensations among {Mo21} and {Mo20}, and (iii) inner-ring formation resulting from eight successive dehydrative condensations between monomolybdate linkers attached to the neighboring head Mo sites.     

ChemInform Abstract: Structural and Vibrational Study of [Mo7O24]6‐ and [W7O24]6‐.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.     

硒钼钒杂多配合物的合成与表征

由钒原子取代杂多阴离子中的钼或钨原子后,形成的多元配合物具有与原来杂多配合物显著不同的催化性质,有关钼钒的同多阴离子,近年报道的有[V2Mo6O26]^6-、[V5Mo8O40]^7-、[V8Mo4O36]^8-等,而三元硒钼钒杂多分配物仅见于[Se2Mo2V6O28]^6-。本文合成了两种硒钼钒三元杂多配合物,并对其进行了表征。     

膜载体酶标记dip-stick快速检测西维因的痕量残留

利用直接竞争酶联免疫吸附分析技术研发了一种快速、灵敏的膜载体酶标记dip-stick农残西维因检测方法。该方法以带正电尼龙膜(Millipore)为固相载体,将西维因抗体包被于膜上,包被有抗体的膜插入含有西维因和西维因酶标抗原的混合液中竞争反应10 min后直接目视判断分析结果。该方法的整个检测过程只需15 min,对西维因的检出限可达到10μg.L-1,且稳定性较好。通过与高效液相色谱法(HPLC)比较,验证了该检测方法的有效性,可作为品质控制和快速定性检测的一种有效工具。     

聚萘二胺修饰电极对痕量物质的检测

综述了聚萘二胺修饰铂电极、玻碳电极和碳糊电极用于检测痕量银离子、铅离子、亚硝酸根及硝酸根阴离子、过氧化氢、葡萄糖和胆甾醇等方面的研究成果，列举了这些电极的优异探测性能，并指出该类电极有望发展成为性能优异的检测电极和传感器。引用文献14篇。     

The V9Mo6O40-FeVMoO7 system

DTA and X-ray powder diffraction methods were used to study the phase equilibria established in the V₉Mo₆O₄₀-FeVMoO₇ system up to 1000° throughout the whole component concentration range. The experimental results are presented in the form of a phase diagram.