Synthesis and crystal structures of yttrium sulfates Y(OH)(SO4), Y(SO4)F,YNi(OH)3(SO4)-II and Y2Cu(OH)3(SO4)2F·H2O

Y(OH)(SO₄), Y(SO₄)F, YNi(OH)₃(SO₄)-II and Y₂Cu(OH)₃(SO₄)₂F·H₂O are obtained from hydrothermal reactions at 380°C under a pressure of 210 MPa. Their crystal structures were refined from single-crystal X-ray diffraction data. The four compounds have the following space groups and unit cells: Y(OH)(SO₄), P2₁/n, a=7.9498(6), b=10.9530(9), c=8.1447(6) Å, β=93.764(1)°; Y(SO₄)F, Pnma, a=8.3128(9), b=6.9255(7), c=6.3905(7) Å; YNi(OH)₃(SO₄)-II, Pnma, a=6.9695(8), b=7.2615(8), c=10.292(1) Å; Y₂Cu(OH)₃(SO₄)₂F·H₂O, P2₁/n, a=11.6889(7), b=6.8660(4), c=12.5280(8) Å, β=97.092(1)°. The coordination environments of the yttrium atoms in the four structures vary from highly irregular 6+2, 6+3, 7+1 coordination polyhedra to relatively regular dodecahedra.     

BeSO4-Al2(SO4)3-Na2SO4三元熔盐体系相图的研究

热分析法研究了BeSO₄-Al₂(SO₄)3-Na₂SO₄三元熔盐体系的状态图。体系中存在三元转熔(包晶)点P,温度490℃,组成为BeSO₄18.8Wt%,Al₂(SO₄)₃15.0%,Na₂SO₄66.2%;三元低共熔(共晶)点E₁,温度为476℃,组成为BeSO₄20.0%,Al₂(SO₄)₃11.2,%,Na₂SO₄68.8%。另一低共熔点E₂温度为595℃,组成未能确定。体系中无三元化合物生成。     

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。     

Synthesis and Structure of [Pd(NH3)4][cis-Pd(NH3)2(SO3)2][Pd(NH3)3(SO3)] · H2O

A new palladium compound [Pd(NH₃)₄][cis-Pd(NH₃)₂(SO₃)₂][Pd(NH₃)₃(SO₃)] · H₂O (I) was synthesized and its structure was studied by X-ray powder diffraction method. In the course of the synthesis, the initial trans-diamminesulfite anionic complex is transformed into the cis-configuration. Further heating in aqueous solution results in isomerization of a substance into a neutral complex [Pd(NH₃)₃(SO₃)]. Crystals I are triclinic: a = 10.3297(2) Å, b = 14.1062(3) Å, c = 6.8531(1) Å, = 101.36(0)°, = 92.74(0)°, = 92.71(0)°, space group P1¯. Structure I consists of the columns with alternating cis-[Pd(NH₃)₂(SO₃)₂]^2– and [Pd(NH₃)₃(SO₃)] complexes and [Pd(NH₃)₄]²⁺ ions between the columns.     

复盐K3Na(SO4)2的热化学研究

钾芒硝是一种成因复杂的复盐[1～ 3 ] ,并且由于钾芒硝Ｋ3 Ｎａ(ＳＯ4 ) 2 与硫酸钾石 [Ｋ3 Ｎａ(ＳＯ4 ) 2 或Ｎａ2 ＳＯ4 ·3Ｋ2 ＳＯ4 ]的化学组成相同 ,未能确定二者是否属于同一种复盐[4 ,5] 。我们合成了复盐Ｋ3 Ｎａ(ＳＯ4 )2[3 ] ,用溶解量热法测定了Ｋ3 Ｎａ(ＳＯ4 )2 和反应物 [Ｎａ2 ＳＯ4 (ｓ) +Ｋ2 ＳＯ4 (ｓ) ]的溶解焓 ,通过设计热化学循环计算出复盐的标准生成焓 ,为我们了解钾芒硝和硫酸钾石是否为同一复盐 ,并为进一步研究其成因和组成提供参考。1　实验部分1 1　试剂与仪器Ｋ2 ＳＯ4 (ｓ)和Ｎａ2 ＳＯ4 (ｓ)为Ａ .Ｒ .…     

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℃。     

Three-body dissociation dynamics of (SO2)3 studied through dissociative photodetachment of (SO2)3−

The dissociative photodetachment dynamics of (SO₂)₃⁻ were studied by photoelectron–photofragment coincidence spectroscopy at 258 nm. Correlation between the photoelectron and photofragment translational energies was observed as previously seen in the dimer system, implying the presence of a dimer core. The three-body dissociation dynamics of (SO₂)₃ after photodetachment are consistent with a dimer core solvated by a spectator SO₂ molecule with a broad distribution in initial geometry.     

LaCl3和Fe2(SO4)3对化学镀Ni-W-P的影响

三氯化镧;硫酸铁;非晶沉积;LaCl3和Fe2(SO4)3对化学镀Ni-W-P的影响     

HCl-In2(SO4)3混合溶液中InCl3活度系数的测定

HCl-In2(SO4)3混合溶液中InCl3活度系数的测定;电池;标准电极电势;离子强度     

Phase Equilibria in the System NH4Al(SO4)2–H2SO4–H2O

Equilibrium solubility curves of the ammonium aluminium sulphate in aqueous solutions of sulphuric acid have been calculated using checked literature data and our own measurements. The concentration of sulphuric acid ranged from 0 to 23 mass%, temperature range between 20 and 60°C has been extrapolated up to 75°C by means of a thermodynamically based correlation method. The solubility correlation as well as the hydration analysis implied a possible destructuralization of solutions at higher acid concentrations. This revised version was published online in August 2006 with corrections to the Cover Date.     

无水钾镁矾类复盐(A＋)2Cd2(SO4)3的热化学

The standard molar formation enthalpies of (A＋)2Cd2(SO4)3[A＋ is NH＋ 4 or K＋] are determined from the enthalpies of dissolution (ΔsHm) of [(A＋)2SO 4(s)＋2CdSO4(s)] and (A＋)2Cd2(SO4)3(s) in twice distilled water or 3 mol•L－1 HNO3 solvent respectively,at 298.2 K,as: ΔfHm [(NH4)2Cd2(SO4)3,s,298.2K]=－3031.74±0.08 kJ•mol－1 ΔfHm [K2Cd2(SO4)3,s,298.2K]=－3305.52±0.17 kJ•mol－1     

固体酸Fe2(SO4)3催化合成丙酸异戊酯

Solid acid ferric sulphate Fe2(SO4)3 was prepared and used for the study of the catalytic synthesis of iso-amyl propionate. The optimun reaction conditions were follows: the ratio of amount of substance n(iso-amylalcohol) : n(propionic acid) = 1.5, the reaction time 2h, the catalyst quantity 1.5g, and dewatering solvent toluene 10ml. The yield was 97.2% under the optimum reaction conditions. The catalyst being of high catalytic activity for the esterification reactions was prepared very easily and could be used repeatedly.     

(NH4)2SO4在TiO2表面上的行为研究

硫助金属氧化物(sulfate promoted metal oxides)是一类新型固体酸催化剂,可用于多种酸催化反应.用(NH_4)_2SO_4、SO_3、SO_2或H_2S 作为助剂,以Fe_2O_3、TiO_2和ZrO_2为底物均可制得硫助金属氧化物(SPMO).     

(NH4)2SO4-NH4SCN-RhB-H2O体系浮选分离汞(Ⅱ)的研究

[Hg(SCN)4]^2-与罗丹明B阳离子(RhB^ )形成不溶于水的三元配合物(RhB)2[Hg(SCN)4]，在一定量(NH4)2SO4存在下，此三元配合物可浮于盐水相上形成界面清晰的两相，在两相形成过程中，Hg^2 被定量浮选，而Cd^2 、Cu^2 、Mn^2 、CO^2 、Ni^2 、Ee^2 、Al^3 等不被浮选，无需加入掩蔽剂就可实现Hg^2 与这些离子之间的定量分离。与其它体系相比，该体系无毒、无环境污染、分相速度快、相分离界面清晰、操作简便、成本低。     

Osmotic and Activity Coefficients of CH3SO4Na(aq) and CH3SO4K(aq) at 25°C

The osmotic and activity coefficients of aqueous sodium and potassium methyl sulfates have been determined at 25°C by the isopiestic method, in the molality range from ca.0.2 to 25 and 19 mol-kg^–1, respectively. The results have been discussed in terms of the ion–ion and ion–water interactions on the basis of the Pitzer and Mayorga model and a method developed in our laboratory.     

Fe2(SO4)3/γ-Al2O3固体超强酸的Mossbauer谱研究

采用浸渍法制备了一系列Fe2(SO4)3/γ-A12O3型固体超强酸样品,用Mossbauer谱和XRD研究了不同温度处理对样品中铁组分的存在状态及稳定性的影响,结果表明,随Fe2(SO4)3含量的变化,铁组分可以在γ-A12O3表面以单层分散和无定形形式存在;当温度≥600℃时,无定形状态的Fe2(SO4)3又生成晶态的Fe2(SO4)3,而形成的晶态Fe2(SO4)3即使在700℃时也不分解.     

Hydrogen-bonded Three-Dimensional Networks Encapsulating One-dimensional Covalent Chains: [Cu(3-ampy)(H2O)4](SO4)·(H2O) (3-ampy = 3-Aminopyridine)

A three-dimensional complex [Cu(3-ampy)(H2O)4](SO4)·(H2O) (3-ampy = 3-aminopyridine) has been synthesized. Crystallographic data: C5H16CuN2O9S, Mr = 343.80, triclinic, space group P, a = 7.675(2), b = 8.225(3), c = 10.845(3) (A), α= 86.996(4), β = 76.292(4),γ = 68.890(4)°, V = 620.0(3) (A)3, Z = 2, Dc = 1.841 g/cm3, F(000) = 354 and μ = 1.971 mm-1. The structure was refined to R = 0.0269 and wR = 0.0659 for 1838 observed reflections (I ＞ 2σ(Ⅰ)). The structure consists of [Cu(3-ampy)(H2O)4]2 cations, SO42- anions and lattice water molecules. 3-Ampy acting as a bidentate bridging ligand generates a 1D covalent chain. A supramolecular 2D framework is formed through π-π stacking of pyridine rings. The lattice water molecules and SO42- anions are located between the adjacent 2D frameworks. The hydrogen bonding interactions from lattice water molecules and SO42- anions to coordinate water extend the 2D framework into a 3D network.