Solid-liquid equilibrium diagrams of common ion binary salt hydrate mixtures involving nitrates and chlorides of magnesium, cobalt, nickel, manganese, and iron(III)

The solid-liquid equilibrium diagrams of binary mixtures involving magnesium nitrate hexahydrate with cobalt nitrate hexahydrate, nickel nitrate hexahydrate (partly), manganese nitrate tetrahydrate, and iron(III) nitrate nonahydrate and of magnesium chloride hexahydrate with cobalt and nickel chlorides hexahydrates and manganese chloride tetrahydrate, and the of two manganese salts were determined. Those diagrams that showed a simple eutectic were fitted by the Ott equation and where the required BET parameters were available, the magnesium salt rich parts of the liquidus were modeled by means of this method.     

A Simple and Convenient One-Pot Synthesis of Benzimidazole Derivatives Using Cobalt(II) Chloride Hexahydrate as Catalyst

A simple and efficient method for the convenient synthesis of 2-arylbenzimidazole has been described on reaction with o-phenylenediamine and various aromatic aldehydes using cobalt(II) chloride hexahydrate as a catalyst. The method is cost-effective, high-yielding, clean, and selective.     

A mild and efficient method for the chemoselective deprotection of acetonides with lanthanum(III) nitrate hexahydrate

Acetonides are hydrolyzed selectively and efficiently with lanthanum(III) nitrate hexahydrate in acetonitrile. The method has good compatibility with other sensitive hydroxyl protecting groups such as trityl, TBDMS, THP, OAc, OBz and OBn.     

Cobalt perchlorate hexahydrate catalyzed one-pot synthesis of dihydropyrimidin-ones/-thiones through sonochemistry and its mechanistic study using density functional theory calculations

A cobalt(II) perchlorate hexahydrate coordinated synthesis of dihydropyrimidin-ones and -thiones through sonochemistry is developed. Herein, the reaction was demonstrated as a simple, efficient, and one-pot method for synthesizing a series of interesting 3,4-dihydropyrimidin-2(1H)-ones. Further, the reaction mechanism was investigated using mass spectrometry and density functional theory calculations suggesting that a Lewis acid character of cobalt(II) perchlorate hexahydrate plays a crucial role in coordinating carbonyl functionalities and stabilizing the polar intermediates like imine–enamine which further led to cyclized dihydropyrimidin-ones and -thiones. This methodology was further explored to synthesize a gram-scale synthesis of monastrol drug, a kinase inhibitor.     

Effect of solid dilutin on the crystal spectra of cobalt ammonium sulphate hexahydrate

Spectra of single crystals of cobalt ammonium sulphate hexahydrate diluted with magnesium ammonium sulphate hexahydrate have been studied as a function of dilution. It has been suggested that the solid dilution lowers the vibrational perturbation and changes the crystal field parameters.     

多孔Ce_(1-x)Nd_xO_(2-y)的微波引诱燃烧合成及其光催化性能研究

采用硝酸铈、硝酸钕、尿素为原料,使用微波引诱燃烧法合成了多孔Ce1-xNdxO2-y固溶体。利用X射线衍射仪、Raman光谱仪、红外光谱仪、扫描电镜、N2吸附-脱附技术、紫外-可见吸收光谱仪等测试手段对产物进行了表征。XRD分析表明,Ce1-xNdxO2-y固溶体的粒径范围在40~60 nm之内,且所有产物为萤石结构。Raman测试表明,在Ce1-xNdxO2-y中,由于Nd3+的掺杂而产生氧空位,且空位浓度随Nd3+掺杂量的提高而增加。红外结果证明,Ce-O键的吸收峰在1400 cm-1左右处,由于Nd3+的掺杂而使得在2346 cm-1的吸收峰消失。从SEM和孔径分布结果可看出,产物为多孔结构。紫外-可见光吸收和可见光催化降解实验表明,随着Nd3+掺杂量的增加,Ce1-xNdxO2-y的紫外吸收增强;由于多孔结构和氧缺位的产生,产物在可见光范围内有较明显的吸收。     

Co_(3)O_(4)/CeO_(2)复合电极材料的制备与超级电容器电化学性能研究

利用六水合硝酸铈、六水合硝酸钴和尿素通过水热法合成麦叶状Co_(3)O_(4)/CeO_(2)复合电极材料,对其进行电化学性能分析,发现Co_(3)O_(4)/CeO_(2)复合电极材料具有良好的电化学可逆性和功率特性,且其电容特性和大电流放电特性也很优越,是理想的超级电容器材料.     

Mild and Efficient Chemoselective Synthesis of Acetals and Geminal Diacetates (Acylals) from Aldehydes using Lanthanum(III) Nitrate Hexahydrate

A mild and efficient chemoselective method has been developed for the preparation of acetals and gem‐diacetates in good to excellent yields through a reaction of aldehydes with ethlyleneglycol or acetic anhydride using catalytic amounts of lanthanum(III) nitrate hexahydrate as a catalyst under solvent‐free conditions.     

CoCl_2·6H_2O or LaCl_3·7H_2O Catalyzed Biginelli Reaction. One-Pot Synthesis of 3,4-Dihydropyrimidin-2(1 H)-ones

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Kinetic investigation of redox reaction between vitamin C and ferric chloride hexahydrate in acidic medium

The kinetics of the reaction between vitamin C (l-ascorbic acid) and ferric chloride hexahydrate was investigated in acidic medium at pH 3 spectrophotometrically. The order of the reaction was established by applying different methods, such as initial rate method, integration method and half-life method. The results obtained from each method were correlated with each other and consistency in all methods was observed. The order of the reaction with respect to each reactant was found first and the overall second order was recommended for the reaction.     

A Novel Green Preparation of a, a''''-Bis (substituted benzylidene)-cycloalkanones Promoted by FeCl_3 6H-2O in Ionic Liquid

a, a'-Bis(substituted benzylidene)cycloalkanones were efficiently prepared from cycloalkanones and benzaldehydes in [bmim][BF4] by using iron(III) chloride hexahydrate as a catalyst. It is shown that [bmim][BF4] and iron(III) chloride hexahydrate can be quantitatively recovered and be reused effectively for many times. Compared with the known methods, this novel process has the advantage of being an envkonmentally benign process together with good yields and mild reaction conditions.     

NiSO4·6H2O as a new,efficient, and reusable catalyst for the α-aminophosphonates synthesis under mild and eco-friendly conditions

Research on Chemical Intermediates - Nickel (II) sulfate hexahydrate is used for the first time as an efficient catalyst for the one-pot synthesis of α-aminophosphonates by three-component...     

A Novel Green Preparation of α,α'-Bis (substituted benzylidene)-cycloalkanones Promoted by FeCl3·6H2O in Ionic Liquid

α, α'-Bis(substituted benzylidene)cycloalkanones were efficiently prepared fromcycloalkanones and benzaldehydes in [bmim][BF4] by using iron(Ⅲ) chloride hexahydrate as acatalyst. It is shown that [bmim][BF4] and iron(Ⅲ) chloride hexahydrate can be quantitativelyrecovered and be reused effectively for many times. Compared with the known methods, thisnovel process has the advantage of being an environmentally benign process together with goodyields and mild reaction conditions.     

微波辐射下FeCl3•6H2O催化绿色合成3,4-二氢嘧啶-2-酮

在微波辐射下, 仅以六水合三氯化铁为催化剂, 将芳香醛、β-二羰基化合物和脲(物质的量比为1∶1.5∶1.5)在无水乙醇中回流, 高效地合成了3,4-二氢嘧啶-2-酮, 反应时间4～6 min, 操作简便, 环境友好.     

Novel preparation of nanocrystalline magnesia-supported caesium-promoted ruthenium catalyst with high activity for ammonia synthesis

A caesium-promoted ruthenium catalyst supported on nanocrystalline magnesia with high activity for ammonia synthesis was conveniently prepared by using hydrated ruthenium trichloride and hexahydrate magnesium nitrate as precursors, whereas dechlorination post-treatment and ready-made magnesia were not necessary.     

The thermal transformations in Zn(No3)2-H2O (1:6) system

Using thermal analysis as well as isothermal gravimetric measurements, the thermal stability of the zinc nitrate(V) hexahydrate has been determined. Some intermediate products are the results of melting, evaporation, hydrolysis, polycondensation and decomposition processes occurring in the salt - water system up to 300°C. Solid phases were characterized by means of chemical analyses and X-ray powder diffraction method. This revised version was published online in July 2006 with corrections to the Cover Date.     

Rapid separation of thorium-234 from uranyl nitrate hexahydrate by adsorption on filter paper from ether solution

A simple method has been developed for the rapid separation of²³⁴Th /UX1/ from uranyl nitrate hexahydrate. The method is based on selective dissolution of uranyl nitrate by diethyl ether on a filter paper. It is shown that almost all UX1 is adsorbed by the filter paper which can be desorbed and brought into solution by 5N HCl or HNO₃. The effect of different parameters on the separation have also been investigated.     

Improvement of ion chromatography with ultraviolet photometric detection and comparison with conductivity detection for the determination of serum cations

Studies were made of the analytical conditions required for indirect photometric ion chromatography using ultraviolet photometric detection (UV method) for the determination of serum cations following a previously developed serum pre-treatment. The sensitivities of the conductivity detection (CD) and UV methods and the amounts of serum cations determined by both methods were compared. Attempts to improve the sensitivity of the conventional UV method are reported. It was found that the mobile phase previously reported by Small and Miller showed no quantitative response when more than 4 mM copper(II) sulphate pentahydrate was used. As a result, there was no significant difference in the amounts of serum cations shown by the CD and UV methods. However, by adding 0.5-5 mM cobalt(II) sulphate heptahydrate, nickel(II) sulphate hexahydrate, zinc(II) sulphate heptahydrate or cobalt(II) diammonium sulphate hexahydrate to 0.5-1.5 mM copper(II) sulphate pentahydrate, higher sensitivity and a quantitative response were attained.     

A mild and efficient chemoselective protection of amines as N-benzyloxycarbonyl derivatives in the presence of La(NO3)3·6H2O under solvent-free conditions

A facile and versatile method for the chemoselective N-benzyloxycarbonylation of amines has been developed by treatment with benzyloxycarbonyl chloride (Cbz-Cl) in the presence of lanthanum(III) nitrate hexahydrate under solvent-free conditions. The method is general for the preparation of N-Cbz derivatives of aliphatic (acyclic and cyclic) and aromatic amines.     

The ternary system H2O–Fe(NO3)3–Co(NO3)2 isotherms 0 and 15 °C

The solid–liquid equilibria of the ternary system H₂O–Fe(NO₃)₃–Co(NO₃)₂ were studied by using a synthetic method based on conductivity measurements.

Two isotherms were established at 0 and 15 °C, and the stable solid phases which appear are the iron nitrate nonahydrate (Fe(NO₃)₃·9H₂O), the iron nitrate hexahydrate (Fe(NO₃)₃·6H₂O), the cobalt nitrate hexahydrate (Co(NO₃)₂·6H₂O) and the cobalt nitrate trihydrate (Co(NO₃)₂·3H₂O).