是[Cu(NH_3)_4]SO_4还是[Cu(NH_3)_4](OH)_2?

在饱和硫酸铜液中滴入适量氨水,得深蓝色溶液,使其结晶,所得晶体是[Cu(NH_3)_4]SO_4还是[Cu(NH_3)_4](OH)_2呢?我们认为解决这个问题是需要实验的,为此我们进行了研究,现将所得结果总结成文,供同行们参考,不当处请指正。     

(NH_4)_2SO_4-Na_2SO_4-NH_4Cl-NaCl-H_2O体系在35℃的溶解度相图

为了降低生产成本,有的化工厂直接利用含硫酸盐的卤水为原料生产化工产品。但在生产的循环过程中,将使SO_4~(2-)离子富集。本文就是研究富集SO_4~(2-)离子后的母液跟铵盐的溶解度关系。A、Seidell曾测定过NaCl—Na_2SO_4—H_2O体系的溶解度相图,报道过NH_4Cl—NaCl—H_2O体系的溶解度相图,H.Dawson等也发表过Na_2SO_4-(NH_4)_2SO_4     

NH_4Al(SO_4)_2·12H_2O的热分解动力学研究

采用热分析(TG-DTA/DTG)、X射线衍射(XRD)研究了固态物质NH4Al(SO4)2.12H2O在氩气中的热分解过程。热分析结果表明,NH4Al(SO4)2.12H2O在氩气中分5步分解,其质量变化率与理论计算相吻合。XRD结果表明,NH4Al(SO4)2.12H2O热分解的最终产物为Al2O3。用Friedman法对各步分解过程的活化能Ea进行了计算,依此为初始值,采用多元非线性回归法得到各个分解步骤可能的动力学模型和参数。     

THE CRYSTAL STRUCTURE OF AgCu(SC(NH_2)_2)_4Cl_2

<正> INTRODUCTION. By mixing aqueous solutions of AgNO_3-Tu(mol ratio 1:1, Tu==SC(NH_2)2) with CuCI-Tu(mol ratio 1:3) we obtained a colourless crystalcompound. Its crystal and molecular structure was determined by X-raydiffraction and shortly reported in this paper.     

（NH_4）_2SO_4─NH_4Cl─NH_4HCO_3—H_2O体系在10

（ＮＨ＿４）＿２ＳＯ＿４─ＮＨ＿４Ｃｌ─ＮＨ＿４ＨＣＯ＿３—Ｈ＿２Ｏ体系在１０℃时的溶解度相图汪庆华，付鹤鉴，宋德镇，刘维铭，于海生（四川联合大学（东区）化学系成都６１００６４）关键词：溶解度相图，硫酸铵，氯化铵，碳酸氢铵在化工生产中，为了降低成本，...     

有关(NH_4)_2S水解的计算

定性分析中,以(NH_4)_2S来沉淀阳离子第三组时,还常常加入NH_4OH。加NH_4OH的作用,被解释为防止(NH_4)_2S水解,使S~(-2)浓度增高,避免第三组硫化物沉淀不完全。这种讲法是从平衡移动的概念出发的,未用计算作量上的考虑。究竟(NH_4)_2S的水解度有多大,加NH_4OH对其水解度有多大的影响,沉淀第三组时,有无必要加入过量NH_40H?关于这些问题计算讨论如下: 一、(NH_4)_2S的水解度及溶液中S~(-2)浓度的计算:     

Crystal structure and single crystal EPR of (NH_4)_2(15-crown-5)_3[Cu(mnt)_2] and (NH_4)_2(benzo-15-crown-5)_4[Cu(mnt)_2]·0.5H_2O

The X-ray crystal structures of (NH4)2(15-crown-5)3[Cu(mnt)2] (1) and (NH4)2(benzo-15-crown-5)4- [Cu(mnt)2]·0.5H2O (2) were determined. Two single crystals are composed of distinct structures of ammonium-crown ether supramolecular cation and [Cu(mnt)2]2? anion. The triple-decker dication in complex 1 and a sandwich dimmer in complex 2 were observed. X-Band EPR studies on the single crystals of both complex 1 and complex 2 have been carried out at room temperature, which revealed that complex 2 showed a perfect hyperfine structure of Cu whereas that of complex 1 could not be observed. The principal values and direction cosines of the principal axes of the g and A tensors were computed by a least-squares fitting procedure. The spin density of Cu(II) was estimated according to the principal values of the A tensors and compared well with the results calculated based on DFT method.     

KBr-乙醇-(NH_4)_2SO_4体系析相萃取分离和富集铱的研究

研究了KBr-乙醇-(NH_4)_2SO_4水体系析相萃取分离和富集铱的行为及与一些金属离子分离的条件.结果表明,(NH_4)_2SO_4能使乙醇的水溶液分成两相,在分相过程中,Ir(Ⅳ)与KBr生成的IrBr_6~(2-)与质子化乙醇(C_2H_5OH~(2+))形成的缔合物[IrBr_6~(2-)][C_2H_5OH~(2+)]_2能被乙醇相完全萃取.当乙醇、KBr和(NH_4)_2SO_4分别为体积分数30%、4.0×10~(-3)mol/J L、0.3 g,mL.pH 3时,Ir(Ⅳ)的萃取率达到99.5%以上,Ga(Ⅲ),Al(Ⅲ),Cr(Ⅲ),Mo(Ⅵ),Fe(Ⅲ),Ni(Ⅱ),Zn(Ⅱ),Co(Ⅱ),Mn(Ⅱ),V(Ⅴ),Ag(Ⅰ),Ru(Ⅲ)和Rh(Ⅲ)基本不被萃取,实现了Ir(Ⅳ)与上述金属离子的分离.     

NH_4[RE(Ac)_4·H_2O]发光稀土配合物的研究

以乙酸和乙酸铵为配体,合成了新颖发光稀土配合物,通过元素分析、红外光谱、热重分析等手段对配合物进行了表征,确定其结构为NH4[RE(Ac)4.H2O](RE=Tb或Eu).结果表明,配合物中羧基以螯合、双齿和单齿方式与稀土离子配位;并通过荧光光谱分析、荧光寿命研究了其发光性能,配合物能发射强的稀土离子的特征荧光且有较长的荧光寿命.     

(NH_2CH_2CH_2NH_3)_4[W~ⅤO_2(OC_6H_4O)_2]_2(NH_3CH_2CH_2NH_3)·H_2O的合成、晶体结构、EPR以及与同构物的比较

在很多生物代谢过程中,微量元素W起着关键作用,W与生物大分子结合形成具有特异功能的钨氧转移酶。1983年从热醋酸菌中提取了第一种钨酶,即甲酸脱氢酶,目前从生物体内提取的钨酶种类已达十二种之多,并发现钨氧转移酶与钼氧转移酶的活性结构因子呈相近性[1]。随着钨酶在生物体内的作用逐步得到重视,及其模拟的功能配合物在探究钨酶的生理活性和催化机理研究中所作的突出贡献,使钨氧转移酶活性结构因子的仿生合成、生理活性以及催化机理研究成为研究热点[2￣14]。根据报道显示,单分子的钨氧模拟配合物中W的价态只有WⅣ、WⅥ两种,且形成一个电…     

无水钾镁矾类复盐(A~ )_2Cd_2(SO_4)_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 (Δ SHm) of [(A＋ )2SO4(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: Δ fH m[(NH4)2Cd2(SO4)3,s,298.2K]=－ 3031.74± 0.08 kJ· mol－ 1 Δ fH m[K2Cd2(SO4)3,s,298.2K]=－ 3305.52± 0.17 kJ· mol－ 1     

STRUCTURE OF { CEu_2 (OOCCH_2NHCOCH_2NH_3)_4 (H_2O)_4]·(C1O_4)_6·4H_2O}_n

<正> {[Eu(OOCCH2NHCOCH2NH3)2(H2O)2]·(ClO4)3·2H2O}2,Mr = 1572,P21/n,a=12. 014(4),b=8. 910(5),c=22. 749(5)A ,β=91. 73(3)°,V = 2034 A3,Z=2,Dx=2. 15g·cm-3,λ(MoKa) = 0. 71073A,R=0. 060 for 3107 unique observed reflections (I≥3σ(I)). The complex cation is of one-dimensional chain structure in which the basic unit is a dinuclear complex and the gly-gly ligands are coordinated to metal atoms in two kinds of forms. The overall structure of the dinuclear unit is dioxo and dicarboxyl-bridged.     

[(NH_3)_5CoImCu(dien)ImCo(NH_3)_5](ClO_4)_6·4H_2O配合物单晶的ESR研究

研究了咪唑桥联异三核配合物[(NH_3)_5CoImCu(dien)ImCo(NH_3)_5](ClO_4)_6·4H_2O与同构配合物[(NH_3)_5CoImZn(dien)ImCo(NH_3)_5]·4H_2O混合单晶在低温(100 K)下的ESR。应用适于求非同轴g张量和A张量的最小二乘法拟合技术,解出标题配合物的g张量和A张量主值分别为:g_1=2.246,g_2=2.093,g_3=2.048,A_1=1.63×10~(-2)cm~(-1),A_2=0.38×10~(-2)cm~(-1),A_3=0.17×10~(-2)cm~(-1)及g_1=2.245,g_2=2.090,g_3=2.051,A_1=1.64×10~(-2)cm~(-1),A_2=0.37×10~(-2)cm~(-1),A_3=0.17×10~(-2)cm~(-1)。配合物Cu~(2+)的4s、3d轨道上的电子自旋密度分别为0.018和0.557。Cu~(2+)与配体间的键有较强的共价性。     

钐铕钆的桩液相色谱分离与测定——P507-HCl-(NH_4)_2SO_4体系

稀土元素的分离与测定是稀土分析中比较困难的任务,而铕与钆的分离则更是稀土元素相互分离的难点之一。文献采用柱液相色谱,以涂渍P507的硅球为固定相,用HCl、HCl-NH_4Cl为流动相使铕钆分离,但分辨率较低、淋洗体积大。我们认为用柱液相色谱分离稀土元素时,固定相中的P507与稀土元素的键合能力由镧至镥的次序逐渐增强;若在流动相     

CRYSTAL STRUCTURE OF Co(H_2O)_3SO_4(phen)

<正> PRELIMINARY INFORMATION. The title compound is a member of a series of cobalt complexes of polydentate ligands currently being investigated. It was prepared by the reaction of CoSO_4·7H_2O with phenanthroline in the equimolar ratio.     

THE PREPARATION AND CRYSTAL STRUCTURE OF IMIDAZOLATE BRIDGED HETEROTRINUCLEAR COMPLEX [ (NH_3)_5 RhlmZn ( dien )-ImRh(NH_3)_5(C10_4)_6·4H_2O

<正> The imidazolate bridged heterotrinuclear complex [(NH3)5RhImZn(dien)-ImRh(NH3)5](ClO4)6·/4H2O,Mr= 1347. 56,was prepared and crystallized in the mono-clinic space group C2/c with unit cell constants, a = 32. 972 (4) , b = 9. 482 ( 1) , c = 15. 250(3) A ,β = 91. 26(1)°,V = 4766. 6A3 and Z=4. The structure was determined from 9043 independent reflections and refined to R=0. 049 for 3051 observed MoKa reflections. The Zn atom showed a distorted trigonal bipyramid coordination, being bonded to three nitrogen atoms of dien and two of imidazole. Each imidazole anion bridged one Zn atom and one Rh atom. The Rh atom was coordinated by six nitrogen atoms,one of which is from imidazole and the five others from NH3 forming a regular octahedral coordination.     

(NH_4)_2[MO_2(S_2)_6]·8/3H_2O的晶体结构

(NH_4)_2[Mo_2(S_2)_6]·~(8/3)H_2O的黑色晶体属于正交晶系,D_2~3-P22_12_1空间群,晶胞参数a=12.064(6)A,b=12.534(4)A,c=19.558(9)A,V=2957(3)A~3,Z=4,D_c=2.23 g·cm~(-3)。结构修正后,R=0.092,R_ω=0.072.晶体由[MO_2(S_2)_6]~(2-)二核原子簇离子、NH_4~ 离子和H_2O分子组成。晶体中有两套晶体学上独立的[Mo_2(S_2)_6]~(2-)离子,其一处在一般位置,另一处在二重轴上。每一不对称单位中含有1.5个[Mo_2(S_2)_6]~(2-)离子,在[Mo_2(S_2)_6]~2-离子中,每个Mo被4个S_(2-)~2侧接配位,按变形的十二面体排列,其中的两个桥式连接于两个Mo之间,其余两个接在外端。Mo-S键长2.441A(平均),S—S键长2.049A(平均)。Mo-Mo键长2.784A(平均),与单键键长相当。Mo的形式价态为五价,很可能是MO~(lV)-Mo~(VI)混合价态,从而在颜色上产生显著特点.     

CRYSTAL STRUCTURE OF [Ni((C)_6H_(11)O)_2PS_2)·(C_4H_9NH_2)_4]-(C_6H_(11)O)_2PS_2

<正> [Ni((C6H11O)2PS2)·(C4H9NH2)4](C6H11O)2PS2,Mr-=938. 05, triclinic,P1,a=13. 513(6),b=16. 040 (7), c= 12. 891(6) A , α= 95. 66 (4),β= 90. 23(4),γ= 75. 46(3)°,V = 2691 A3,Z=2,Dc= 1. 16 g·cm3.μ=6. 07cm-1,MoKa radiation, λ=0. 71069 A ,F(000) = 1020,R=0. 100 for 4595 reflections with I≥3σ(I). The title compound molecule consists of a complex cation [Ni((C6H11O)2PS2)(C4H9-NH2)4]+ and a complex anion (C6H11O)2PS2- . The Ni (Ⅱ) atom in the cation is octahedrally coordinated by four nitrogen atoms from four w-butylamine ligands and two sulfur atoms from one (C6H11O)2PS2 group.     

Hydrothermal Syntheses, Crystal Structure and Thermal Behavior of [(CH_3)_2NH_2]_2[B_5O_6(OH)_4]_2·[HCON(CH_3)_2] and [NH_3CH_2CH_2NH_3]_2·[B_(14)O_(20)(OH)_6]

Two novel organic base templated nonmetal borates [(CH₃)₂NH₂]₂[B₅O₆(OH)₄]₂·[HCON(CH₃)₂] ( ? ) and [NH₃CH₂CH₂NH₃]₂[B₁₄O₂₀(OH)₆] ( II ) have been synthesized under hydrothermal conditions, and characterized by elemental analyses, FT‐IR spectroscopy, X‐ray diffraction, and TG‐DTA. Their crystal structures were determined from single crystal X‐ray diffraction. The crystal structure of compound I is characterized by forming a 3D supramolecular structure with large channels along axes b and c through O? H···O hydrogen‐bonding among the [B₅O₆(OH)₄]^? anions. The crystal structure of compound II is characterized by forming a 3D supramolecular structure with large channels along axis a and direction [111] through O? H···O hydrogen‐bonding among the [B₁₄O₂₀(OH)₆]^4? anions. The templating organic amine cations in I and II are both obtained through in situ hydrothermal reactions, and are both located in the channels of the 3D supramolecular structure, respectively. Their thermal behavior has been also investigated.     

Synthesis and Crystal Structure of [Pd(NH_3)_4]Cl_2·2[Pd(NH_3)_3Cl]Cl

PreparahonofsomecomplexcomPOundsof[Pd(NH3)41X2tw,tvhereX=Cl-,Br,I-,X2=Co,:-,RdChl'-,etc.,wasdescribedasearlyl942l'].SynthesisandcryStalstIUCtUreOfthesaltSt'ithamons,Cr2o7",Cro.:',MoO"',andC,o'=',ttcrestillreportedmorcrecenh/'-'j.IPd(NH)4lX2,tvhereX=Cl',BrandNOz,isanotherkindofamndnepalladiumcomplexcompounds.IntheSyStemofIPd(NH).1"-Cl'-H2o,diamlltinedichloridepalladium(II)wasObtalnedbythereachonOfIPd(NH)4lHcomplexionwtthanutebydrogenchloride,andtetrachloridepalladiumaDbythe…