Eu^3＋,Bi^3＋Me2Y8（SiO4）6O2中的发光特性与取代格位

在紫外光激发下，Ｅｕ＾３＋和Ｂｉ＾３＋在Ｍｅ２Ｙ８（ＳｉＯ４）６Ｏ２基质（Ｍｅ＝Ｍｇ，Ｚｎ，Ｃａ，Ｓｒ）中分别发射红光（＾５Ｄ０－＾７Ｆ２）和蓝光（＾３Ｐ１－＾１Ｓ０）．Ｅｕ＾３＋发光的红橙比随着激发波长和Ｍｅ＾２＋的不同而变化。荧光拉曼光谱表明，Ｅｕ＾３＋在四种基质中同时占据了４ｆ格位和６ｈ格位。依据Ｂｉ＾３＋发光的Ｓｔｏｋｅｓ位移推断，当Ｍｅ＝Ｃａ，Ｚｎ时，Ｂｉ＾３＋主要占据４ｆ格位，而当Ｍｅ     

配合物E（η~5－Me_3SiC_5H_3）_2［Fe（CO）］_2（μ－CO）_2的合成与结构

硅桥连配体Ｅ（Ｍｅ_３ＳｉＣ_５Ｈ_４）_２（Ｅ＝ＳｉＭｅ_２（Ⅰ），Ｍｅ_２ＳｉＯＳｉＭｅ_２（Ⅱ），以下同）与Ｆｅ（ＣＯ）_５在二甲苯中加热反应，生成配合物Ｅ（η~５Ｍｅ_３ＳｉＣ_５Ｈ_３）_２［Ｆｅ（ＣＯ）］_２（μ－ＣＯ）_２．~１ＨＮＭＲ和四圆Ｘ射线衍射分析表明化合物１、２皆为顺式构型．反应过程中存在严重的脱硅基现象。１、２皆为单斜晶系，Ｐ２_１／ｍ空间群。１：α＝０．７３５９（３）ｎｍ，ｂ＝１．９４０９（１）ｎｍ，ｃ＝０．９３８３（５）ｎｍ，β＝９９．７１（４）°，Ｚ＝２；２：α＝０．６７４３（５）ｎｍ，ｂ＝２．２６３５（５）ｎｍ，ｃ＝１．０８０２（１）ｎｍ，β＝１０８．１（２）°，Ｚ＝２。     

流化床反应器中α-FeOOH粒子表面水解包覆SiO2过程研究

研究了流化床反应器中α－ＦｅＯＯＨ粒子表面脱水与正硅酸乙酯（ＴＥＯＳ）水解反应形成ＳｉＯ２包覆层的过程,结果表明,α－ＦｅＯＯＨ脱水促进了粒子表面水解反应,有利于形成均匀的ＳｉＯ２包膜,同时还进一步研究了反应温度、反应时间、ＴＥＯＳ浓度和氨浓度对ＳｉＯ２包覆量的影响,采用这一技术,一步实现了脱水、包覆和还原过程,得到了性能良好的ＳｉＯ２包覆了Ｆｅ２Ｏ４磁性粉末。     

FETV—ICP—AES中选择挥发直接测定高纯氧化钇中痕量钛

基于氟化电热蒸发过程中发生的元素选择挥发，提出了以聚四氟乙烯（ＰＴＦＥ）沮体为氟化剂的ＦＥＴＶ－ＩＣＰ－ＡＥＳ直接测定高纯氧化钇国痕量钛的新方法。研究了待测元素和基体的氟化蒸发行为；考察了影响待测元素钛蒸发过程的各种因素。在优化实验条件下，方法的检出奶为１．０ｎｇ／ｍｌ，相对标准偏差为２．３％。本法简便、灵敏、无需进行化学前处理，可用于高纯固体粉末试样中以南钛的直接测定，试样分析回收率大于９６％。     

（四甲基二硅撑）双（3—三甲硅基环戊二烯基）—四羰基二铁…

标题化合物（Ｍｅ２ＳｉＳｉＭｅ２）〔η＾５－（３－Ｍｅ３ＳｉＣ５Ｈ３）Ｆｅ（ＣＯ）２〕２／（μ－ＣＯ）２（Ａ）分子中的Ｆｅ－Ｆｅ键被钠汞齐还原断裂，生成相应的双铁负离子，分别与ＭｅＣＯＣｌ、ＰｈＣＯＣｌ、ＰｈＣＨ２Ｃｌ、ＣｌＣＨ２ＣＯＯＣ２Ｈ５和Ｐｈ３ＳｎＣｌ进行亲核取代反应，生成在铁原子上引入相应取代基的产物（Ｍｅ２ＳｉＳｉＭｅ２）〔η＾５－（３－Ｍｅ３ＳｉＣ５Ｈ３）Ｆｅ（ＣＯ）２Ｒ〕２（Ｒ：Ｍ     

（四甲基二硅撑）二（3－三甲硅基环戊二烯基）四羰基二铁及其相关化合物的合成及结构

１，２－二（三甲硅基环戊二烯基）四甲基二硅烷与Ｆｅ（ＣＯ）_５在二甲苯中于１０５～１１０℃反应除分离到少量标题化合物（Ｍｅ_２ＳｉＳｉＭｅ_２）［η－（３－Ｍｅ_３ＳｉＣ_５Ｈ_３Ｆｅ（ＣＯ）］_２（μ－ＣＯ）_２（５）外，主要是生成了脱Ｍｅ_３Ｓｉ基的产物（Ｍｅ_２ＳｉＳｉＭｅ_２）［η－Ｃ_５Ｈ_４Ｆｅ（ＣＯ）］_２（μ－ＣＯ）_２（１）及１的热重排异构体［Ｍｅ_２ＳｉＣ５Ｈ４－Ｆｅ（ＣＯ）_２］_２（２）．将５的二甲苯溶液加热回流１８ｈ，则转化为其异构体［Ｍｅ_２Ｓｉ（Ｍｅ_３ＳｉＣ_５Ｈ_３）Ｆｅ（ＣＯ）_２］_２（６）．脱硅基发生在由相应反应物制备５的过程中。且脱硅基是与反应物中（Ｍｅ_２ＳｉＳｉＭｅ_２）桥的存在有关．５的晶体结构经Ｘ射线衍射测定属单斜晶系，Ｐ２_１／ｍ空间群，晶体学数据：ａ＝０．６７８０（１）ｎｍ，ｂ＝２．２３０３（９）ｎｍ，ｃ＝０．９９８８（１）ｎｎ，；β＝９８．９６（１）°，Ｖ＝１．４９６０ｎｍ~３．Ｚ＝２，Ｄ_ｃ＝１．３６ｇ／ｃｍ~３．     

FeY沸石的二次合成和表征

采用预处理法二次合成ＦｅＹ沸石，并用ＸＲＤ，ＩＲ，ＥＳＲ，ＭＢＳ等手段进行样品进行表征，结果表明，经（ＮＨ４）２ＳｉＦ６预处理的样品，有更多的Ｆｅ进入沸石骨架脱铝位，进入沸石骨架位的Ｆｅ以四面体或畸变四面体配位形式存在，且不易还原成低价Ｆｅ由于Ｆｅ进入沸石骨架，样品的晶胞参数增大，骨架红外反对称和对称伸缩振动率向低波数位移，而未经（ＮＨ４）２ＳｉＦ６预处理的样品，Ｆｅ只能有限地取代骨架位的铝，且骨     

悬浮体进样／氟化电热蒸发（ETV）／ICP—AES直接测定二氧化钛 …

以聚四氟乙烯（ＰＴＦＥ）悬浮体为氟化剂,肖体制样／氟化辅助电热蒸发（ＥＴＶ）／ＩＣＰ－ＡＥＳ直接测定ＴｉＯ２陶瓷粉末中痕量杂质钇考察了影响基体和等测元素的蒸发过程的各种因素,对比研究了待测元素和基体的氟化蒸发行为,实现了基体和待测元素的预分离,显著降低了基体效应。本法的检出限为０．２６μｇ／Ｌ。相对偏差为３．８％（ｎ＝５,ｃ＝０．５ｍｇ／Ｌ）。     

（四甲基二硅撑）双（3－三甲硅基环戊二烯基）－四羰基二铁的反应性

标题化合物（Ｍｅ_２ＳｉＳｉＭｅ_２）［η￣５－（３－Ｍｅ_３ＳｉＣ_５Ｈ_３）Ｆｅ（ＣＯ）_２］_２／（μ－ＣＯ）_２（Ａ）分子中的Ｆｅ－Ｆｅ键被钠汞齐还原断裂，生成相应的双铁负离子，分别与ＭｅＣＯＣｌ、ＰｈＣＯＣｌ、ＰｈＣＨ_２Ｃｌ、ＣｌＣＨ_２ＣＯＯＣ_２Ｈ_５和Ｐｈ_３ＳｎＣｌ进行亲核取代反应，生成在铁原子上引入相应取代基的产物（Ｍｅ_２ＳｉＳｉＭｅ_２）［η￣５－（３－Ｍｅ_３ＳｉＣ_５Ｈ_３）Ｆｅ（ＣＯ）_２Ｒ］_２（Ｒ：ＭｅＣＯ（１），ＰｈＣＯ（２），ＰｈＣＨ_２（３），ＣＨ_２ＣＯＯＣ_２Ｈ_５（４），Ｐｈ_３Ｓｎ（５），Ｉ（６））。Ａ在氯仿中与碘反应，得到Ｆｅ－Ｆｅ断裂的双铁碘化物，但在苯中与过量碘反应，则得到Ｆｅ－Ｉ－Ｆｅ桥联的离子型化合物（Ｍｅ_２ＳｉＳｉＭｅ_２）［η￣５－（３－Ｍｅ_３ＳｉＣ_５Ｈ_３）Ｆｅ（ＣＯ）_２］_２Ｉ·Ｉ（７）。化合物６的晶体和分子结构经Ｘ射线衍射测定，６属单斜晶系，Ｐ２１／ｃ空间群，ａ＝１．７２１７（４）ｎｍ，ｂ＝０．７７５３（２）ｎｍ，Ｃ＝１．３６２９（７）ｎｍ，β＝１０３．８０（３）°，Ｖ＝１．７６７（２）ｎｍ３，Ｚ＝４，Ｄｃ＝１．６２９９·ｃｍ－１，最终偏差因子Ｒ＝０．０５４。     

ESR STUDY OF ZrO_2 CATALYST

ＥＳＲＳＴＵＤＹＯＦＺｒＯ＿２ＣＡＴＡＬＹＳＴ￥ＷｅｎＬＩ；ＬｉａｎｇＢｏＦＥＮＧ；ＹｕａｎＱｉＹＩＮ（ＬａｎｚｈｏｕＩｎｓｔｉｔｕｔｅｏｆＣｈｅｍｉｃａｌＰｈｙｓｉｃｓ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ，Ｌａｎｚｈｏｕ７３００００）...     

同时求出滴定剂与被滴定物质浓度的氧化还原滴定计算分析法

对氧化还原滴定计算分析法同时测定Ce^4 与Fe^2 进行了研究。以铂电极为指示电极，在Fe^3 存在的条件下，用Ce^4 溶液滴定Fe^2＋溶液，可同时求出Ce^4 与Fe^2 的浓度。讨论了Fe^3 浓度对测定结果的影响。     

Heterocyclic dithiocarbazate iron chelators: Fe coordination chemistry and biological activity

The iron coordination and biological chemistry of a series of heterocyclic dithiocarbazate Schiff base ligands is reported with regard to their activity as Fe chelators for the treatment of Fe overload and also cancer. The ligands are analogous to tridentate heterocyclic hydrazone and thiosemicarbazone chelators we have studied previously which bear NNO and NNS donor sets. The dithiocarbazate Schiff base ligands in this work also are NNS chelators and form stable low spin ferric and ferrous complexes and both have been isolated. In addition an unusual hydroxylated ligand derivative has been identified via an Fe-induced oxidation reaction. X-ray crystallographic and spectroscopic characterisation of these complexes has been carried out and also the electrochemical properties have been investigated. All Fe complexes exhibit totally reversible Fe(III/II) couples in mixed aqueous solvents at potentials higher than found in analogous thiosemicarbazone Fe complexes. The ability of the dithiocarbazate Schiff base ligands to mobilise Fe from cells and also to prevent Fe uptake from transferrin was examined and all ligands were effective in chelating intracellular Fe relative to known controls such as the clinically important Fe chelator desferrioxamine. The Schiff base ligands derived from 2-pyridinecarbaldehyde were non-toxic to SK-N-MC neuroepithelioma (cancer) cells but those derived from the ketones 2-acetylpyridine and di-2-pyridyl ketone exhibited significant antiproliferative activity.     

经由MOFs煅烧制得多孔Fe2O3表面修饰十二烷基磺酸钠:一种高活性且易回收的燃油脱氮光催化剂（英文）

化石燃料燃烧的排放物是目前最严重的环境污染源,其中含氮有机物燃烧产生的NOx等是污染大气和形成雾霾的主要污染物.伴随石油存量的不断减少、重质石油的更多利用以及机动车的大规模增加,由此引起的污染问题日趋严重,因此发展高效的燃油脱氮技术对保护环境意义重大.光催化氧化是近几十年发展起来的新型高级氧化还原技术,由于其可以利用太阳光且在室温下进行,成本低易于进行,是一类理想的燃油脱氮技术.在众多光催化材料中,α-Fe2O3无毒、廉价且具有合适的带隙(2.3 eV),是目前公认较好的光催化材料.然而,在光催化过程中α-Fe2O3较快的电子-空穴复合速度以及过低的比表面积极大降低了其效率.通常,选择性地设计高比表面的多孔半导体金属氧化物被认为是一种简单且实效的提高光催化反应效率的方法.近年来,以金属有机框架结构(MOFs)为硬模板制备多孔金属氧化物的方法逐渐获得了科学家们的关注,这主要得益于热稳定性差的MOFs本身可以通过调控金属离子以及配体种类从而实现原位均匀的调节和修饰半导体金属氧化物,而且可以作为获得多孔性材料的基底.本文通过水热法合成了一种典型的MOFs即MIL-100(Fe).利用MIL-100(Fe)材料自身多孔性及热不稳定性,采用自模板法煅烧制备成多孔Fe2O3.制得的多孔Fe2O3亲油性较差,进行模拟燃油脱氮光催化反应时相互之间容易聚集成团,无法均匀分散于燃油体系中,导致光催化脱氮效率较低.因此,若能对所得多孔Fe2O3进行表面修饰使其亲油性增强并可均匀分散于于燃油体系中,无疑将促进底物的吸附,从而提高光催化燃油脱氮效果.Fe2O3表面带有正电荷,因此我们巧妙地选用一种阴离子表面活性剂十二烷基磺酸钠(SDS)作为修饰剂,采用简单的静电自组装方法制备了SDS/Fe2O3光催化剂.选用吡啶脱氮作为探针反应,考察了SDS/Fe2O3复合光催化剂的可见光光催化性能.结果表明,与未使用修饰剂的Fe2O3相比,SDS/Fe2O3中长链烷基的存在使其表面亲油性增强,能够在模拟燃油溶液中更加均匀地分散进而提高了脱氮效率.其中煅烧温度为450 C且修饰0.25%SDS的样品活性最佳,可见光(λ≥420 nm)照射240 min后吡啶的脱氮率接近100%.     

Amorphous-to-crystalline transformation of ultrathin Fe Layers:57Fe Mössbauer study of artificial multilayers

Multilayered films consisting of ultrathin Fe layers with spacer layers of other materials, such as Mg, Nd, or C, have been prepared by using vacuum deposition techniques. The properties of Fe layers have been investigated from⁵⁷Fe Mössbauer spectroscopy. If the stacking is nonepitaxial, the structure of the Fe layers is amorphous as long as the thickness is less than a critical value. It is found that a structural transformation from amorphous to crystalline (bcc) generally takes place in the course of nonepitaxial film growth.     

Binding of 67 Ga and 59 Fe to ferritin or transferrin

The bindings of 67Ga and 59Fe to ferritin or transferrin in vitro has been investigated. Affinity constants have been measured using the equilibrium dialysis, and the results have been obtained as follows: 1 Apo-ferritin could not bind to 67Ga until it was transformed into ferritin in presence of Fe-citrate. On the contrary, the affinity of 67Ga to ferritin was reduced when Fe was released from ferritin; thus indicating that Fe-core has been required for the binding of 67Ga to ferritin. 2 Binding of 67Ga to ferritin was inhibited with apo-transferrin, and this was also shown in the case of 59Fe. In the presence of NaHCO3 or citrate, more remarkable inhibitions were observed. NaHCO3 or citrate was found to give a synergistic effect on the binding of 67Ga to transferrin, as well as Fe-transferrin. Therefore, both 67Ga and 59Fe could not bind to ferritin in the state of 67Ga- or 59Fe-transferrin. 3 The release of 59Fe from 59Fe-transferrin was enhanced with adenosine triphosphate (ATP), citrate, or ascorbic acid, while any of these reagents did not affect the release of 67Ga from 67Ga-transferrin. The comparison of 59Fe and 67Ga through their bindings to ferritin or transferrin has suggested one of points to distinguish 67Ga from 59Fe in the cell.     

硫族桥原子对类立方烷簇[Fe_4X_4](X=S、Se、Te)成键特征的影响

本文用EHMO法对[Fe_4X_4(SPh)_4]~(3-)和(Fe_4X_4(NO)_4](X=S、Se、Te)等六个类立方烷型簇合物的电子结构进行了计算,并分析讨论了桥基改变对这些类立方烷电子结构和成键特征的影响。结果表明,桥基S被Se、Te取代后前线区域分子轨道中桥基成份明显增大,能级普遍升高;Fe—X键强度减弱,Fe—Fe间作用稍有增强;能级间隔△E(LUMO—HOMO)则随端基配体类型的不同而增大或减少。     

Phase separation and extraction with acetonitrile for sample preparation in HPLC analysis

Summary Acetonitrile can be salted-out from aqueous solution by adding tetrabutylammonium perchlorate. This phase separation method has been used for the extraction of the Fe(III)-4,7-diphenylphenanthroline complex into acetonitrile followed by direct injection onto an ODS column. The Fe complex is separated by using 9:1 acetonitrile/water as a mobile phase. The proposed reversed-phase high-performance liquid chromatography has been applied to the determination of Fe in serum.     

Electron distribution in iron octaethyloxophlorin complexes. Importance of the Fe(III) oxophlorin trianion form in the bis-pyridine and bis-imidazole complexes

The apportionment of electrons between iron and the porphyrinic macrocycle in complexes of octaethyloxophlorin (H3OEPO) has been a vexing problem. In particular, for (Py)2Fe(OEPO), which is an important intermediate in heme degradation, three resonance structures involving Fe(III), Fe(II), or Fe(I), respectively, have been considered. To clarify this matter, the electronic and geometric structures of (Py)2Fe(III)(OEPO), (Im)2Fe(III)(OEPO).2THF, and (Im)2Fe(III)(OEPO).1.6CHCl3 have been examined by single-crystal X-ray diffraction, measurement of magnetic moments as a function of temperature, and EPR and NMR spectral studies. The results clearly show that both complexes exist in the Fe(III)/oxophlorin trianion form rather than the Fe(II)/oxophlorin radical form previously established for (2,6-xylylNC)(2)Fe(II)(OEPO.). In the solid state from 10 to 300 K, (Py)2Fe(III)(OEPO) exists in the high-spin (S = 5/2) state with the axial ligands in parallel planes, a planar porphyrin, and long axial Fe-N distances. However, in solution it exists predominantly in a low-spin (S = 1/2) form. In contrast, the structures of (Im)2Fe(III)(OEPO).2THF and (Im)2Fe(III)(OEPO).1.6CHCl3 consist of porphyrins with a severe ruffled distortion, axial ligands in nearly perpendicular planes, and relatively short axial Fe-N distances. The crystallographic, magnetic, EPR, and NMR results all indicate that (Im)2Fe(III)(OEPO) exists in the low-spin Fe(III) form in both the solid state and in solution.     

Sm2Fe17-xSbx的化学合成与磁性质

稀土与铁形成的 L n2 Fe17金属间化合物的居里温度较低 ,不能用于永磁材料 .近年来的研究表明 ,当 L n2 Fe17金属间化合物的间隙格位被氮占据时可大大提高材料的居里温度和饱和磁化强度 [1,2 ] ,但由于形成的金属氮化物属于热力学亚稳相 ,因而只能用于粘结磁体 .为得到性能更好、更加稳定的稀土永磁材料 ,人们对其它元素取代的 Ln2 Fe17进行了大量的研究 ,发现一些主族和过渡金属元素 (如 Al,Ga,Cr或 Si等 )取代 Sm2 Fe17中的部分铁可以改善材料的磁性能 [3] ;从以往对铁系金属间化合物的结构与磁性的研究可以知道 ,部分取代使稀土 -铁…