NH4VO3在NH4H2PO4-H2O和(NH4)3PO4-H2O体系中的溶解度

采用等温溶解法测定了偏钒酸铵(NH₄VO₃)在NH₄H₂PO₄-H₂O和(NH₄)₃PO₄-H₂O体系中T = 298.15-328.15 K时的溶解度以及溶液的密度和pH值。结果表明, NH₄VO₃的溶解度随着(NH₄)₃PO₄或NH₄H₂PO₄溶液浓度的增大,先降低后升高,这是由于同离子效应、化学反应平衡及离子活度的共同作用。比较T = 298.15K时, NH₄VO₃分别在NH₄H₂PO₄-H₂O、(NH₄)₂HPO₄-H₂O和(NH₄)₃PO₄-H₂O体系中溶解度,发现在相同的磷酸盐浓度下, NH₄VO₃的溶解度在NH₄H₂PO₄-H₂O体系中最大,在(NH₄)₃PO₄-H₂O体系中居中,在(NH₄)₂HPO₄-H₂O体系中最小。进一步地,在T = 298.15 K和磷酸盐浓度C = 0.5 mol·kg^-1时,结合pH值和反应溶度积常数K_SP等计算三个体系中的平均离子活度系数(γ_±),发现γ_±值在(NH₄)₂HPO₄-H₂O体系中最大,在(NH₄)₃PO₄-H₂O体系中居中,在NH₄H₂PO₄-H₂O体系中最小,与溶解度规律一致。     

Conductivity of Al2(WO4)3–WO3 and Al2(WO4)3–Al2O3 Composites

Russian Journal of Electrochemistry - Composites of (1 – x)Al2(WO4)3–xWO3 and (1 – x)Al2(WO4)3–xAl2O3 are synthesized and their conductivity is studied as dependent on the...     

H3PO4-BF3/ZrO2及H3PO4-BF3H2SO4/ZrO2催化剂上异丁烷/丁烯的烷基化反应

研究了H₃PO₄-BF₃/ZrO₂及H₃PO₄-BF₃-H₂SO₄/ZrO₂催化剂对异构烷烃烷基化反应的催化作用。就载体的焙烧温度、活性组分的浓度、BF₃及H₂SO₄的添加及反应温度对催化剂活性的影响进行了较为详尽的研究。     

Crystal Structure of 3-Methyl-4-methoxy-3-(3-methyl-4- methoxy-2-benzofuranyl) -2-H-benzofuranyl

1　ＩＮＴＲＯＤＵＣＴＩＯＮ3ｍｅｔｈｙｌ4ｈｙｄｒｏｘｙｂｅｎｚｏｆｕｒａｎｉｓａｎｉｎｔｅｒｍｅｄｉａｔｅｕｓｅｄｆｏｒｔｈｅｓｙｎｔｈｅｓｉｓｏｆｎａｔｕｒｅｐｒｏｄｕｃｔｓ[1].Ｉｔｈａｓｂｅｅｎｓｙｎｔｈｅｓｉｚｅｄｆｒｏｍ1,3ｄｉｈｙｄｒｏｘｙｂｅｎｚｅｎｅ[2-3].Ｔｏｓｙｎｔｈｅｓｉｚｅａｂｉｅｔａｎｅｑｕｉｎｏｎｅｄｉｔｅｒｐｅｎｏｉｄｓｗｉｔｈｉｔ[4,5],ｗｅｉｎｔｅｎｄｅｄｔｏｐｒｏｔｅｃｔｔｈｅｈｙｄｒｏｘｙａｔｔａｃｈｅｄｔｏｉｔｗｉｔｈＭｅ2ＳＯ4.Ｆｉｎａｌｌｙ,ｔｗｏｃｏｍｐｏｕ…     

Structure of [NH3(CH2)4NH3]2P4O12·2H2O

After a short survey of what is the present state of the cyclophosphates associated with the organic molecule NH₂(CH₂)₄NH₂, we report chemical preparation and crystal structure for a new example of such compounds. [NH₃(CH₂)₄NH₃]₂P₄O₁₂.2H₂O is monoclinic (S.G. : P2₁/n), with Z = 2 and the following unit-cell parameters : a = 7.6728(8) Å, b = 18.962(3) Å, c = 7.9789(9) Å β = 111.751(9)°. Bidimensional layer arrangement of P₄O₁₂ rings connected to the water molecules thanks to weak H-bonds run parallel to the ab plane. The organic groupements located between these inorganic planes perform the three-dimensional cohesion by NH····O hydrogen bonds.     

H3PO4—BF3／ZrO2及H3PO4—BF3—H2SO4／ZrO2催化剂的酸性及结构研究

本文研究了固体酸烷基化反应催化剂H3PO4－BF3／ZrO2及H3PO4－BF3－H2SO4／ZrO2的酸性及其结构。用指示剂法及正丁胺滴定法测定了催化剂的酸强度及酸量；用吸附吡啶的红外光谱法研究了催化剂的表面酸类型；用FT－IR、XPS、XRD、DTA－TG及TPDE等方法研究了催化剂的结构。结果表明；两种催化剂表面均只有Broensted酸，酸强度为－8．2＜H0≤-5.6。H3PO4-BF3/ZrO2中，活性组分强能是以H2PO4^-：BF3的形态存在，BF3通过与H2O4^-的络合作用是催化剂的活性增强。H3PO4－BF3／ZrO2中，存在H2SO4与ZrO2的成盐作用，同时亦有可能存在H2SO4与H3PO4、BF3之间的相互作用。催化剂在下焙烧失活的主要原因是H2PO4^-失水生成P2O7^4－，使催化剂表面质子酸量大幅度降低所致。     

Li2SO4-MgSO4及LiNO3-Mg(NO3)2熔盐体系的研究

用目测变温法和差热分析法研究了Li₂SO₄-MgSO₄、LiNO₃-Mg(NO₃)₂熔盐体系。在前一体系中有固液异组成化合物Li₂SO₄·2MgSO₄生成,它在832°熔化分解。化合物与Li₂SO₄间形成低共熔点,温度为647℃,组成含MgSO₄23.6Wt%。Li₂SO₄多晶转变点575℃,在加入MgSO₄后形成类低共熔点,温度552℃,组成含MgSO₄4.2%。LiNO₃-Mg(NO₃)₂为一简单低共熔体系,共晶点含Mg(NO₃)₂47.3%,温度200℃。     

Crystallographic study of YCo3+1−2xCo2+xPt4+xO3 and DyCo3+1−2xCo2+xPt4+xO3

The crystal structures of single crystals of YCo³⁺_.36Co²⁺_.32Pt⁴⁺_.32O₃ and DyCo³⁺_.36Co²⁺_.32Pt⁴⁺_.32O₃ have been examined at room temperature, and shown to be isostructural with GdFeO₃, which belongs to space group Pbnm. The overall expansion of octahedra caused by substitution of platinum enhances the distortion of rare-earth dodecahedra by moving 4 out of 12 oxygens further away from the rare-earth ions, as shown by the rotation of octahedra along the [110] axis. No order has been found for Co²⁺, Co³⁺, and Pt⁴⁺.     

Crystal structure of K3SbS4·4 1/2 H2O

Summary The crystal structure of K₃SbS₄·4 1/2 H₂O, monoclinic, P2₁/c-C ₅ ^2h ,a=12.732(3),b=7.720(2),c=13.928(4) Å, =90.19(1)°,V=1369.0(5) ų,Z=4, has been determined from X-ray single crystal data and refined by least-squares methods toR=0.031 for 3 024 reflections. The structure is built up from KS_{4 – 5}(H₂O)_{3 – 5} polyhedra and SbS₄ tetrahedra (Sb-S=2.327 Å) which are three-dimensionally linked. The water molecules are bonded to two or three K⁺ ions and form exclusively O-H ... S-type hydrogen bonds. One of the five crystallographically different water molecule sites is due to space limitations only half occupied.

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Die Kristallstruktur von K₃SbS₄·4 1/2 H₂O

Zusammenfassung Die Kristallstruktur von K₃SbS₄·4 1/2 H₂O, monoklin, P2₁/c-C ₅ ^2h ,a=12.732(3),b=7.720(2),c=13.928(4) Å, =90.19(1)°,V=1369.0(5) ų,Z=4, wurde mit Röntgen-Einkristalldaten bestimmt und für 3 024 Reflexe aufR=0.031 verfeinert. Die Kristallstruktur ist aus dreidimensional verknüpften KS_{4 – 5}(H₂O)_{3 – 5}-Polyedern und SbS₄-Tetraedern (Sb-S=2.327 Å) aufgebaut. Die Wassermoleküle sind an zwei bis drei Kaliumionen gebunden und bilden ausschließlich Wasserstoffbrücken des Typs O-H...S aus. Eine der fünf kristallographisch verschiedenen H₂O-Lagen ist aus Platzmangel nur zur Hälfte besetzt.

     

4-ClCH2COAP-La(NO3)3-H2O和4-ClCH2COAP-LaCl3-H2O三元体系30℃时溶度测定

安替比林及其4位取代衍生物是较强的配位剂,可与不同的稀土盐作用生成组成各不相同的配合物,为了进一步探讨安替比林的衍生物对稀土离子的配位作用,我们研究了以4-一氯乙酰基安替比林(4-ClCH₂COAP)为配体与硝酸镧或氧化镧的三元水盐体系。     

Crystal Structure of 3-(4-nitro-) phenylsulfonyloxyisothiazole NO_2C_6H_4SO_3C_3H_2NS

1INTRoDUCTIONFollowingpublicationofthefirstsynthesisofamononuclearisothiazoleinl956(li,thisringsystemhasattractedconsiderableinterest.Especially,thistenden-....1cyisincreasingsincealotOfreportsaboutexcellentbiologicalactivitiesofcompoundscontainingisothiazolemoietyemergerecently"~".Theincreasingunderstandingofthefundamentalchemistryoftheisothiazolesystemhasenabledchemiststoincorpo-ratetheringintoawidevarietyofcompoundswithpotentialbiologicalactivity.Inanattempttolookforbiologicallyactivec…     

Synthesis and Crystal Structure of GaPO_4-C_4: Ga_3P_3O_12 H_2O H_2NCH_2CH_2NH_2

A gallophosphate, Ga3 P3O12 H2O · H2NCH2CH NH2, named GaPO -C4 was hydrothermally synthesized from EDA(ethylenediamine)-Ga2O3-P2O5-H2O systems. The crystal structure of GaPO4-C4 was determined by single crystal X-ray diffraction. The compound crystallizes in monoclinic system with space group P21/n, a=8.688(4)A, b = 17.952(6)A, c=9.104(3)A, β=108.27(3), V=1348.3A3 . The framework of GaPO4-C4 contains three types of P atoms and three types of Ga atoms. Of the three types of gallium atoms, two types are located in distorted trigonal bipyramids and the third type lies at tetrahedral centre. The three-dimensional framework is built of two-dimensional nets which consist of irregular 3-, 4-, 5- and 8-rings and contains 8-ring channels running along [101], in which ethylenediamine templates are located.     

新型杂多化合物[(CH3CH2)4N]4H3O· {Na[(HMo2O5)3(HPO4)(H2PO4)3]2}·(H2PO4)2·10H2O的水热合成与晶体结构

杂多化合物在催化、医药、材料及光化学等方面具有广泛的应用前景 [1～ 4 ] ,其中钼磷多金属氧酸盐具有优异的氧化催化性能 [5,6 ] .近年来合成的新奇结构的钼磷多金属氧酸盐中已测定结构的有含帽[7,8] 和非帽[9～ 12 ] 系列 .本文利用水热法合成了未见文献报道的结构新颖的夹心型磷钼多金属氧酸盐[( CH3CH2 ) 4N]4 H3O{Na[( HMo2 O5) 3( HPO4 ) ( H2 PO4 ) 3]2 }· ( H2 PO4 ) 2 · 1 0 H2 O,并测定了其晶体结构 .1　实验与晶体结构分析1 .1　仪器与试剂　元素 Na用美国原子吸收分光光度计测定 ;C,H和 N用 Perkin- Elmer 2 4 0…     

La2NiO4／Al2O3催化剂上CH4／CO2的重整

 通过溶胶－凝胶方法制备了尖晶石结构的La2NiO4／Al2O3催化剂，采用BET，XRD和TG表征了催化剂的孔分布、比表面积、体相组成以及凝胶样品的热失重和热分解过程．将催化剂应用于CH4／CO2重整反应制合成气，考察了惰性气体和反应温度对转化率、选择性以及积碳的影响．结果表明，在高空速（GHSV＝4．8×104ml／（g·h））下，CH4和CO2转化率分别为51％和60％，CO和H2的选择性约为98％和92％，惰性气体He的引入明显地提高了CH4和CO2的转化率．     

Synthesis of 1-Benzoyl-3-aryl-4-hydroxy-4-phenylimidazolidin-2-thiones

l-Benzoyl-3-aryl-4-hydroxy-4-phenylimidazolidin-2-thiones can be synthesized readily from the cyclization of 1-benzoyl-3-arylthioureas with bromine-acetophenone in the presence of excess triethylamiqe.     

The structure of the VO2F3−4 ion: Crystal structure of (NH4)3VO2F4

The VO₂F³⁻₄ ion has a cis octahedral structure, as is shown by single crystal structure analysis of the title compound. The unit cell of (NH₄)₃VO₂F₄ (space group Immm or I222, a = 912.6(2), b = 1881.8(4), c = 626.4(1) pm, Z = 6) contains two symmetrically independent anions. One is rotationally disordered. Oxo and fluoro ligands cannot be distinguished. But the second one has a distorted cis octahedral structure with the lengths 170.0(4), 186.1(4), and 202.3(4) pm for the VO, VF (axial), and VF (equatorial) bonds. Infrared and Raman spectra as well as theoretical considerations support the crystallographic results. The phase transitions at 418 and 215 K were confirmed by variable temperature X-ray powder diffraction. Above 418 K the cubic cryolite type structure is adopted with a = 902.6(2) pm. Plausible mechanisms for the phase transitions are suggested.     

KBrO3-CH3CH(NH2)CO2H-MnSO4-[Fe(phen)3]SO4-H2SO4体系的化学振荡反应

本文首次报道须在两种金属离子同时作用下的振荡反应——KBrO_3-CH_3CH(NH_2)CO_2H-MnSO_4-[Fe(phen)_3]SO_2-H_2SO_4体系的振荡反应,对反应产物作了分析,研究了两种金属离子在振荡反应中的不同作用,Mn~(2+)起催化氧化丙氨酸以产生丙酮酸的作用,而[Fe(phen)_3]~(2+)则是丙酮酸-BZ型反应的催化剂.研究了温度变化对振荡反应的影响,从而得出振荡反应各阶段的表观活化能.考察了Cl~-、自由基抑制剂及反应物浓度对振荡反应的影响.实验证明,振荡反应同时受Br~-及Br_2的控制,振荡机理与Br_2-水解控制模型相同.     

KBrO3-CH3CH(NH2)CO2H-MnSO4-[Fe(phen)3]SO4-H2SO4体系的化学振荡反应

本文首次报道须在两种金属离子同时作用下的振荡反应─KBrO3-CH3CH(NH2)CO2H-MnSO4-[F3(phen)3]SO4-H2SO4体系的振荡反应, 对反应产物作了分析, 研究了两种金属离子在振荡反应中的不同作用, Mn^2^+起催化氧化丙氨酸以产生丙酮酸的作用, 而[Fe(phen)3]^2^+则是丙酮酸-BZ型反应的催化剂。研究了温度变化对振荡反应的影响, 从而得出振荡反应各阶段的有观活化能。考察了Cl^-、自由基抑制剂及反应物浓度对振荡反应的影响。实验证明, 振荡反应同时受Br^-及Br2的控制, 振荡机理与Br2^-水解控制模型相同。