SrB4O7·3．5H2O的合成、表征与热化学研究

合成了一种新型碱土金属硼酸盐SrB4O7·3．5H2O,并对它进行了化学分析、红外光谱（IR）、X射线衍射（XRD）及热分析（TC—DTA）等一系列物相鉴定与表征。通过设计热力学循环,利用微热量计测定了SrB4O7·3．5H2O溶解于约1mol·L^-1 HCl水溶液中的摩尔溶解焓,再结合H3BO,在HCl（aq）的摩尔溶解焓,Sr（OH）2·8H2O（s）溶解于[HCl（aq）＋H3BO3（aq）]的摩尔溶解焓,以及H2O（1）、Sr（OH）2·8H2O（s）与H3BO3（s）的标准摩尔生成焓,得到了SrB4O7·3．5H2O的标准摩尔生成焓为-（4435．15±3．30）kJ·mol^-1。     

盐卤硼酸盐化学 ⅩⅤ.2MgO·B_2O_3.MgCl_2·14H_2O和MgO.2B_2O_3·9H_2O的热化学研究

合成氯柱硼镁石(2MgO·2B_2O_3·MgCl_2·14H_2O)和章氏硼镁石(MgO·2B_2O_3·9H_2O),用恒定温度环境反应热量计测定溶解热和反应热的基础上,运用热化学循环原理计算得到这两种硼酸盐的标准生成焓。     

Zn(Thr)Ac2·2H2O固态配合物的制备及标准生成焓

在水-丙酮混合溶剂中合成了未见文献报导的Zn(Thr)Ac2@2H2O固态配合物,通过化学分析、元素分析、IR、XRD和TG-DTG等对其组成、结构及热稳定性进行了研究.用微量热法测定了配合物在298.15 K时在纯水中的溶解焓,计算了Zn(Thr)2+(aq,∞)和Zn(Thr)Ac2@2H2O(s)的标准摩尔生成焓分别为(955.24±5.70)kJ@mol-1和(-570.92±5.71)kJ@mol-1.     

Synthesis and Thermodynamic Properties of MgO·B_2O_3·4H_2O

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｒｅａｒｅｍａｎｙｋｉｎｄｓｏｆｍａｇｎｅｓｉｕｍｂｏｒａｔｅｓ ,ｂｏｔｈｎａｔｕｒａｌａｎｄｓｙｎｔｈｅｔｉｃ .Ａｂｏｒａｔｅｄｏｕｂｌｅｓａｌｔ (2ＭｇＯ·2Ｂ2 Ｏ3 ·ＭｇＣｌ2 · 14Ｈ2 Ｏ)ｎａｍｅｄｃｈｌｏｒｏｐｉｎｎｏｉｔｅｗａｓｏｂ ｔａｉｎｅｄｆｒｏｍｔｈｅｎａｔｕｒａｌｃｏｎｃｅｎｔｒａｔｅｄｓａｌｔｌａｋｅｂｒｉｎｅ .1Ｉｎｏｒｄｅｒｔｏｆｉｎｄｔｈｅｆｏｒｍｉｎｇｒｅｌａｔｉｏｎｂｅｔｗｅｅｎｔｈｅｄｏｕｂｌｅｓａｌｔａｎｄｍａｇｎｅｓｉｕｍ ｂｏｒａ…     

复盐Zn2HIO6• 1.25H2O的热化学研究

由于高碘酸盐及其复盐晶体具有优良的电学性能和抗腐蚀性能,在分析上也很有应用价值［１］三元相高碘酸盐－高碘酸－水系统早在６０年代就引起了人们的兴趣,Ｄｒａｔｏｖｓｋｙ等人对它进行了大量的研究［２－５］．八十年代Ｎａｂａｒ等人用新的方法合成了几种新的高碘...     

Zn(Thr)Ac2•2H2O固态配合物的制备及标准生成焓

在水-丙酮混合溶剂中合成了未见文献报导的Zn(Thr)Ac2•2H2O固态配合物,通过化学分析、元素分析、IR、XRD和TG-DTG等对其组成、结构及热稳定性进行了研究.用微量热法测定了配合物在298.15 K时在纯水中的溶解焓,计算了Zn(Thr)2＋(aq,∞)和Zn(Thr)Ac2•2H2O(s) 的标准摩尔生成焓分别为(955.24±5.70) kJ•mol－1和(-570.92±5.71) kJ•mol－1.     

Synthesis and Structural Characterization of [Mn（phen）2（H2O）2]（OAc）2.6H2O

1 INTRODUCTION Water oxidation to oxygen gas by photo- synthetic apparatus of green plants and cyano- bacteria is the origin of this gas in the atmosphere. The water oxidation center is a tetranuclear, oxide- bridged manganese cluster with O,N-based peri- pheral ligation by amino acid side-chain group[1, 2]. The binding of aqua to the Mn site may be impor- tant to the oxidation of aqua for producing dioxygen. 1,10-Phenanthroline has been adopted to simulate coordination sphere of manga…     

Preparation and Characterization of Fe/Al2O3 Nanocomposites

IntroductionAl2O3ceramic objects have a wide scope of appli-cations because of their high hardness, high intensity,low density, and superior chemical stability, whereasmetals are widely used for their excellent propertiessuch as good ductibility, electric…     

Kristallstrukturen des Sr(BrO3)2 · H2O,Ba(BrO3)2 · H2O,Ba(IO3)2 · H2O,Pb(CIO3)2 · H2O und Pb(BrO3)2 · H2O

Crystal Structure of Sr(BrO₃)₂ · H₂O, Ba(BrO₃)₂ · H₂O, Ba(IO₃)₂ · H₂O, Pb(ClO₃)₂ · H₂O, and Pb(BrO₃)₂ · H₂O The crystall structures of the isostructural halates Sr(BrO₃)₂ · H₂O, Ba(BrO₃)₂ · H₂O, Ba(IO₃)₂ · H₂O, Pb(ClO₃)₂ · H₂O, and Pb(BrO₃)₂ · H₂O were determined using X-ray single crystal data (monoclinic space group C2/c? C, Z = 4), The mean bond lengths and bond angles of the halate ions in the Ba(ClO₃)₂ · 1 H₂O-type compounds, which correspond to those of other halates, are Cl? O, 149.0, Br? O, 165.9, I? O, 180.2 pm, ClO₃^?, 106.4, BrO₃^?, 104.0, and IO₃^?, 99.6°. The structure data obtained are discussed in terms of possible orientational disorder of the water molecules, strengths of the hydrogen bonds, influence of the lead ions on the structure, and site group distortion of the halate ions.     

Calcium and strontium thio­sulfate,CaS2O3·6H2O and SrS2O3·5H2O

In contrast to former morphological studies, the results presented here show that calcium(II) thio­sulfate hexahydrate, CaS₂O₃·6H₂O, crystallizes centrosymmetrically in the pinacoidal class (point group ). The structure is characterized by chains, parallel to [100], of alternating S₂O₃ and Ca(H₂O)₆O₂ groups sharing common O atoms. The composition of each chain link is [Ca(H₂O)₆(S₂O₃)]. The geometry is analysed and compared in detail with the structural features of monoclinic strontium(II) thio­sulfate pentahydrate, SrS₂O₃·5H₂O, which forms layers, parallel to (100), of alternating S₂O₃ and Sr(H₂O)₄O₅ groups connected via common O atoms and O–O edges. Each layer contains [Sr(H₂O)₃O(S₂O₃)]_∞ as the unique repeat unit.     

Crystal structures of hydrates of simple inorganic salts. III. Water‐rich aluminium halide hydrates: AlCl3·15H2O,AlBr3·15H2O,AlI3·15H2O,AlI3·17H2O and AlBr3·9H2O

Water‐rich aluminium halide hydrate structures are not known in the literature. The highest known water content per Al atom is nine for the perchlorate and fluoride. The nonahydrate of aluminium bromide, stable pentadecahydrates of aluminium chloride, bromide and iodide, and a metastable heptadecahydrate of the iodide have now been crystallized from low‐temperature solutions. The structures of these hydrates were determined and are discussed in terms of the development of cation hydration spheres. The pentadecahydrate of the chloride and bromide are isostructural. In AlI₃·15H₂O, half of the Al³⁺ cations are surrounded by two complete hydration spheres, with six H₂O in the primary and 12 in the secondary. For the heptadecahydrate of aluminium iodide, this hydration was found for every Al³⁺.     

Zur Koordination des Aluminiums in den Calciumaluminathydraten 2 CaO · Al2O3 · 8 H2O und CaO · Al2O3 · 10 H2O

On the Coordination of Al in the Calcium Aluminate Hydrates 2 CaO · Al₂O₃ · 8 H₂O and CaO · Al₂O₃ · 10 H₂O By investigations with high-resolution ²⁷Al-NMR in solids it is shown that in the compound 2 CaO · Al₂O₃ · 8 H₂O the Al merely exist in octahedral coordination. According to this and considering its structural relationship with 4 CaO · Al₂O₃ · 19 H₂O the dicalcium aluminate hydrate is proposed to be formulated as [Ca₂Al(OH)₆][Al(OH)₃ (H₂O)₃]OH. Likewise for the compound CaO · Al₂O₃ · 10 H₂O the octahedral coordination of the Al is proved by ²⁷Al-NMR. This result corresponds with literature according to which a constitution as cyclohexaaluminate Ca₃[Al₆(OH)₂₄] · 18 H₂O is proposed.     

Über die Alkaliselenoarsenate(III) KAsSe3 · H2O,RbAsSe3 · 1/2 H2O und CsAsSe3 · 1/2 H2O

On the Alkali Selenoarsenates(III) KAsSe₃ · H₂O, RbAsSe₃ · 1/2 H₂O, and CsAsSe₃ · 1/2 H₂O The alkali selenoarsenates(III) KAsSe₃ · H₂O, RbAsSe₃ · 1/2 H₂O, and CsAsSe₃ · 1/2 H₂O have been prepared by hydrothermal reaction of the respective alkali carbonate with As₂Se₃ at a temperature of 135°C. Their X-ray structural analyses demonstrated that the compounds contain polyselenoarsenate(III) anions (AsSe₃^?)_n, in wich the basic units are ψ-AsSe₃ tetrahedra, which are linked together through Se? Se bonds into infinite zweier single chains. The Rb and Cs salts are isotypic.     

Zur Kenntnis der Phase BaO · Al2O3 · 7 H2O

On the Compound BaO · Al₂O₃ · 7 H₂O On the basis of investigations using ²⁷Al, ¹H NMR, IR and thermoanalytical methods for the compound BaO · Al₂O₃ · 7 H₂O a constitution as Ba_n[Al₂(OH)₈]_n · 3n H₂O with condensed AlO₆ groups, sharing edges, is proposed. Relations between the Ba/Al ratio and the constitution of anions of barium aluminate hydrates are discussed.     

MgO·3B2O3·3.5H2O的合成、表征及其溶液Raman光谱分析

硼是具有独特化学行为的稀有亲氧元素，在自然界中主要是以无机硼氧酸和硼氧酸盐形式存在。在硼酸盐晶体中，硼以聚合硼氧配阴离子形式存在，其中配位数为３和４的硼原子比可以有所不同，这使得硼酸盐种类繁多，结构复杂多样。至今，人们在自然界和实验室已发现了４种六硼酸镁盐犤１，２犦：MgO·３B２O３·nH２O（n＝７．５，７，６，５），它们的分子结构中都含有犤B６O７（OH）６犦２－基团。最近，我们在硼酸盐化学系列研究中，利用复盐氯柱硼镁石在沸点温度下的硼酸溶液中的相转化，合成了一种新的六硼酸镁盐MgO·３B２O３·３．…     

K2TiSi3O9·H2O

Single crystals of dipotassium titanium trisilicate hydrate were synthesized and the crystal structure was refined using data from single‐crystal X‐ray diffraction. The structure is a three‐dimensional mixed framework and contains channels formed by six‐ and eight‐membered rings. K⁺ ions and water mol­ecules are located in the channels.     

MoCu3TeO7Cl2·0.5H2O

Single crystals of molybdenum(VI) tricopper(II) tellurium(IV) hepta­oxide dichloride hemihydrate, MoCu₃TeO₇Cl₂·0.5H₂O, were synthesized via a transport reaction in sealed evacuated silica tubes. All atoms occupy general positions within the triclinic () unit cell. The building units are irregular CuO₄Cl and CuO₃Cl₂ square pyramids, distorted TeO₃₊₁E trigonal bipyramids (E is the lone pair of Te^IV) and irregular MoO₅ pyramids. The TeO₃₊₁E, CuO₄Cl and CuO₃Cl₂ polyhedra form (110) layers bridged by Mo atoms. The water mol­ecules are located in [100] channels.