bluuebunny/crossref_metadata_2025 huggingface dataset:
Theoretical Study on the NO2 + NO2− Electron Transfer Reaction
Authors: Zhou Zheng‐Yu , Gao Hong‐Wei , Xing Yu‐Mei , Guo Li , Qu Yu‐Hui
Published: September 2010

The NO2 + NO2− electron transfer reaction was studied with DFT‐B3LYP method at 6‐311 + G* basis set level for the eight selected structures: four species favor the structure of “head to head”. The geometry of transition state was obtained by the linear coordinate method. Three parameters, non‐adiabatic activation energy (Ead), coupling matrix element (Hif) and reorganization energy (λ) for electron transfer reaction can be calculated. According to the reorganization energy of the ET reaction, the values obtained from George‐Griffith‐Marcus (GGM) method (the contribution only from diagonal elements of force constant matrix) are larger than those obtained from Hessian matrix method (including the contribution from both diagonal and off‐diagonal elements), which suggests that the coupling interactions between different vibrational modes are important to the inner‐sphere reorganization energy for the ET reactions in gaseous phase. The value of rate constant was obtained by using above three activation parameters.
On the Criteria of Instability for Electrochemical Systems
Authors: Li Ze‐Lin , Ren Bin , Niu Zhen‐Jiang , Xiao Xiao‐Ming , Zeng Yue , Tian Zhong‐Qun
Published: September 2010

Both cyclic‐voltammetry‐based and impedance‐based experimental criteria that have been developed recently for the oscillatory electrochemical systems are critically appraised with two typical categories of oscillators. Consistent conclusions can be drawn by the two criteria for the category of oscillators that involve the coupling of charge transfer mainly with surface steps (e.g. ad‐ and desorption) such as in the electrooxidation of C1 organic molecules. Whereas, impedance‐based criterion is not applicable to the category of oscillators that involve the coupling of charge transfer mainly with mass transfer (e.g. diffusion and convection) such as in the Fe(CN)63‐ reduction accompanying periodic hydrogen evolution. The reason is that the negative impedance cannot include the feedback information of convection mass transfer induced by the hydrogen evolution. However, both positive and negative nonlinear feedbacks, i. e., the diffusion‐limited depletion and convection‐enhanced replenishment of the Fe(CN)63‐ surface concentration, that coexist between the bistability, i.e., Fe(CN)63‐ reduction with and without hydrogen evolution at lower and higher potential sides respectively, are all reflected in the crossed cyclic voltammogram (CCV). It can be concluded that the voltammetry‐based criterion (in time domain) is more intuitive, less time‐consuming and has a wider range of applications than the impedance‐based one (in frequency domain).
Reductive Coupling Cyclization of 1,1‐Dicyanoalkenes Promoted by Sm0/cat. HgCl2 System
Authors: Zhang Ji‐Ming , Zhang Yong‐Min
Published: September 2010

The intermolecular reductive coupling cyclization reactions of 1,1‐dicyanoalkenes promoted by Sm0/cat. HgCl2 were studied. A possible reaction mechanism was proposed.
An ab initio Study of Intermolecular Potential for Ne—HBr Complex
Authors: Zhang Yu , Shi Hong‐Yun
Published: September 2010

The potential energy surface of the ground state of the Ne—HBr complex has been calculated at several levels of theory, including the single and double excitation coupled‐cluster method with noniterative perturbation treatment of triple excitation CCSD(T). Calculations have been performed using the augmented correlation‐consistent polarized quadruple zeta basis set (aug‐cc‐pVQZ). Using the complete basis set (CBS), the global minimum with a well depth of approximate 70.516 cm−1 has been found for the linear Ne—Br—H structure (θ = 180.0°) with the distance between the Ne atom and the center of mass of the HF molecule equals (0.351 nm). In addition to the global minimum, there is a secondary minimum at Rm = 0.410 nm and θ=0° (a well depth of 57.898 cm−1). At last, the effects of the basis sets, H—Br bond length and theoretical methods on the intermolecular potential calculations of such weakly bound van der Waals complexes were discussed.
Application of Nafion/ Cobalt Hexacyanoferrate Chemically Modified Electrodes for the Determination of Electroinactive Cations by Ion Chromatography
Authors: Xu Ji‐Ming , Xian Yue‐Zhong , Shi Guo‐Yue , Li Jin‐Hua , Li‐Tong Jin
Published: September 2010

An amperometric detector based on the chemical modification of Nafion and cobalt (II) hexacyanoferrate (II, III) thin film (Nafion/Co‐CN‐Fe) onto a glassy carbon (GC) electrode was firstly developed for the determination of electroinactive cations (Li+, Na+, K+, Rb+, Cs+ and NH4+) in single column ion chromatography. A set of well‐defined peaks of electroinactive cation was obtained. The relative standard deviations (RSDs) of chromatographic peak height (nA) for these cations were all below 3.8%. The cations were detected conveniently in the linear concentration range of 6.0 × 10−6‐5.0 × 10−3 mol/L and their correlation coefficients were all above 0.99. The detection limits of the cations were 9.2 × 10−6 mol/L for Li+, 3.4 × 10−6 mol/L for Na+, 6.3 × 10−7 mol/L for K+, 7.8 × 10−7 mol/L for Rb+, 6.2 × 10−7 mol/L for Cs+ and 6.2 × 10−6 mol/L for NH4+, at a signal‐noise ratio of 3. The method was quick, sensitive, simple and was successfully applied to the analysis of rainwater samples. The electrode was stable for a 2 week period of operation with no evidence of chemical or mechanical deterioration.
Inorganic‐Organic Hybrid 18‐Molybdodiphosphate Nanoparticles Bulk‐modified Carbon Paste Electrode and Its Electrocatalysis
Authors: Wang Xiu‐Li , Kang Zhen‐Hui , Wang En‐Bo , Hu Chang‐Wen
Published: September 2010

A kind of inorganic‐organic hybrid 18‐molybdodiphosphate nanoparticles ([(C4H9)4N]6P2Mo18Q62·4H2O) was firstly used as a bulk‐modifier to fabricate a three‐dimensional chemically modified carbon paste electrode (CPE) by direct mixing. The electrochemical behavior of the solid nanoparticles dispersed in the CPE in acidic aqueous solution was characterized by cyclic and square‐wave voltammetry. The hybrid 18‐molybdodiphosphate nanoparticles bulk‐modified CPE (MNP‐CPE) displayed a high electrocatalytic activity towards the reduction of nitrite, bromate and hydrogen peroxide. The remarkable advantages of the MNP‐CPE over the traditional polyoxometalates‐modified electrodes are their excellent reproducibility of surface‐renewal and high stability owing to the insolubility of the hybrid 18‐molybdodiphosphate nanoparticles.
Upper Rim Diester‐bridged Calix[4]arenes and Oligocalix [4]‐arenes: the Effects of the Length of Bridged Reagents on Their Distribution
Authors: Zeng Cheng‐Chu , Yuan Hu‐Shan , Huang Zhi‐Tang
Published: September 2010

A series of monobridged calix[4] arenes 3a‐f, cyclic biscalix [4] arenes 4a‐f, diametrically bridged at the upper rim with saturated aliphatic diester chains, have been synthesized. The results at dilute conditions show that the percentage of yields of mono‐, bis‐ and oligo‐calix[4]arenes are related to the length of the chains. With the shortening of the chains, the percentage of monocalix[4] arenes decreased. All the calix[4] arene moieties are in a cone conformation according to the AB quartet pattern of the methylene protons between the phenolic rings in the 1H NMR spectra.
Synthesis and Crystal Structure of Bis[(2,6‐pyridinedicarboxylato) (methanol) dibenzyltin (IV)]
Authors: Yin Han‐Dong , Wang Chuan‐Hua , Wang Yong , Ma Chun‐Lin
Published: September 2010

A novel seven‐coordinate dimer bis[(2,6‐pyridinedicarboxylato)(methanol)dibenzyltin(IV)] was synthesized by the reaction of (PhCH2)3SnCl with 2,6‐pyridine dicarboxylic acid in 1:1 molar ratio in methanol solution. The structure was characterized by elemental analysis, IR and 1H NMR spectra, and the crystal structure was determined by X‐ray single crystal diffraction analysis. The crystal belongs to monoclinic space group P21/n, a =0.96250(19) nm, b = 1.0947(2) nm, c = 1.9965(4) nm, β = 92.31(3)°, Z = 2, V = 2.1019(7) nm3, Dc = 1.574 g/cm3, μ = 1.248 mm−1, F(000)=1000, R1 = 0.0675, wR2 = 0.0836. In the crystals of the complex, each tin atom is seven‐coordinated in a distorted bipyramidal structure.
Ytterbium Coordination Polymer with Four Different Coordination Numbers: The First Structural Characterization of Lanthanide Phthalate Complex
Authors: Wan Yong‐Hong , Jin Lin‐Pei , Wang Ke‐Zhi
Published: September 2010

The novel ytterbium coordination polymer is a two‐dimensional framework in which the central metal ions have four different coordination numbers and form four kinds of coordination polyhedra. The four kinds of coordination polyhedra connect into infinite chains by sharing oxygen atoms.
Thermodynamic Properties of Transfer for Tetraphenylarsonium Tetraphylborate from Water to n‐Alkanols
Authors: Zou Li‐Zhuang , Wang Xiao‐Ling , Zhu Shu‐Quan , Wei Lu‐Bin , Lu Yao , Wang Jin‐Ben
Published: September 2010

Solubilities of tetraphenylarsonium tetraphenylborate (Ph4AsB‐Ph4) in water, methanol, ethanol, 1‐propanol, 1‐butanol, 1‐pentanol, 1‐hexanol and 1‐octanol at T = 293.2, 298.2, 303.2 and 308.2 K have been determined by spectrophotometry. The standard transfer Gibbs energy (Δtr‐G0w‐s) and entropy (Δtr‐G0w‐s) of Ph4AsBPh4 from water to the n‐alkanols at temerature from 293.2 K to 308.2 K have been obtained. Furthermore, the contribution of microscopic interaction to the standard Gibbs energy of transfer for Ph4AsBPh4 was calculated and discussed. The results show that the effect of hydrophobic interaction of Ph4AsBPh4 on its transfer process is the most important factor. According to the thermodynamical principle, the transfer process of Ph4AsBPh4 from water to the n‐alkanols is the entropy dominated.
Theoretical Study on Reactivity of Electron Transfer in Model‐System of Oxidation of α ‐Amino Carbon‐centered Radical by O2
Authors: Li Xiang‐Yuan , Liu Ji‐Feng , Yu Hua‐Bin
Published: September 2010

Electron transfer reaction between a simplified model molecule of α‐amino carbon‐centered radical and O2 has been studied with ab initio calculations at the MP2/6‐31 ++ G**//UHF/6‐31 ++ G** level. The reactant complex and the ion pair complex have been optimized and employed to perform calculations of the reaction heat and the reorganization energy. Solvent effects have been considered by applying the conductor‐like screening model. Theoretical results show that the highly endothermic charge separation process, in which one electron transfers from the α‐amino carbon‐centered radical to O2, so as to form an ion pair complex, is difficult to occur in gas‐phase. By applying an external electronic field to prepare the charge‐localized molecular orbitals, the charge‐separated state has been obtained using the initial‐guess‐induced self‐consistent field technique. The theoretical investigations indicate that the solvent effect in the process of the oxidation of α‐amino carbon‐centered radical by O2 is remarkable. From the rate constant estimation, it can be predicted that the oxidation of the model donor molecule by O2 can proceed, but not very fast. A peroxyl radical compound has been found to be a competitive intermediate in the oxidation process.
Crystal Structure and Magnetic Property of Heteronuclear Copper‐Lanthanum Carboxylate Complex
Authors: Wu Bin , Lu Wei‐Min , Zheng Xiao‐Ming
Published: September 2010

The title complex, [CuLaL5 (phen) (C2H5OH)]2 (where L = α‐methylacrylato; phen = 1, 10‐phenanthroline), has been prepared and its structure has been determined by X‐ray diffraction analysis. The complex crystallizes in triclinic system with space group P 1. Crystal data: a = 1.2725 (3) nm, b = 1.4421 (4) nm, c = 1.2109 (2) nm, α = 109.48 (2)°, β = 115.26 (2)°, γ = 66.42 (2)°. The complex is a discrete tetranuclear CuLaLaCu molecule bridged by α‐methylacrylato groups. Magnetic property of the complex was also measured and discussed.
Synthesis and Structural Characterization of Two Molybdenumphosphate Cluster Compounds: (C14N14H63) Na (H2Mo6P4O31)2 · 8H2O and (C14N14H63) Na (H2Mo6P4O31)2 · 5H2O
Authors: Wen Fu‐Shan , Chen Wei , Shi Zhan , Li Guang‐Hua , Yu Zhen‐Tao , Chen Jie‐Sheng
Published: September 2010

(C14N14H63) Na (H2Mo6P4O31)2 · 8H2O (1) with amine‐separated sodium molybdenumphosphate clusters and (C14N14H63) Na (H2Mo6P4O31)2 · 5H2O (2) with H‐bonded duster layers were synthesized from hydrothermal systems. Compound 1 crystallizes in the triclinic space group P · with a = 1.27445 (2) nm, b = 1.37183 (3) nm, c = 1.41515 (3) nm, α = 100.497 (1)°, β = 109.064 (1)° and γ = 115.498 (1)°. Whereas compound 2 has a monoclinic space group P21/n with a = 1.3418 (5) nm, b = 2.7787 (12) nm, c = 2.0314 (10) nm and β = 96.571 (14)°. There exist protonated ethylenediamine cations and H2O molecules between adjacent dusters, connecting the dusters through H‐bonds.
Pendant‐armed Unsymmetrical Aza‐macrocycles: Syntheses, Coordination Behavior and Crystal Structure of a Dinuclear Cadmium Complex
Authors: Tao Jing‐Chao , Liao Xin‐Cheng , Wang Xing‐Wang , Du Chen‐Xia
Published: September 2010

Two unsymmetrical tetradentate aza‐macrocycles with side arms attached to the Nsp3 atoms, L1 and L2, as well as their complexes with different metal cations were synthesized and characterized by EA, UV, IR, 1H NMR and MS spectra. Both the two ligands can efficiently transport alkali and transition metal cations across an organic membrane with high selectivity ratio. The structure of a dinuclear Cd (II) complex [L1] · (Cd‐Cl2)2 was elucidated by X‐ray crystallography and was solved by the heavy‐atom method to a final R value of 0.029 for 3084 reflections with |F| > 3σ (I). In the exo‐structure of the dinuclear complex each cadmium atom is five‐coordinated, bonding to three N atoms and two chlorine atoms.
A New Fluorimetric Reagent for Determination of Trace Amounts of Europium
Authors: Lin Peng , Zheng Hong , Zhu Qing‐Zhi , Xu Jin‐Gou
Published: September 2010

In this paper, a new ligand, 2, 9‐bis [N, N‐bis (carboxymethyl) ‐aminomethyl] −1, 10‐phenanthroline, was synthesized and used to establish a novel fluorimetric method for the determination of trace amounts of europium. The fluorescence intensity was a linear function of the concentration of europium in the range,of 4.0 × 10−9—1.0 × 10−6 mol/L. The detection limit was 1.0 × 10−9 mol/L. The standard addition method was used to determine the europium in a synthetic rare‐earth sample and high purity Y2O3 matrix with satisfactory results.
Single‐Molecular Imaging of Anticoagulation Factor I from Snake Venom by Atomic Force Microscopy
Authors: Xu Xiao‐Long , Zhou Yun‐Shen , Liu Qing‐Liang , Hou Jian‐Guo , Yang Jing‐Long , Xie Yong‐Shu
Published: September 2010

Anticoagulation factor I (ACF I) from the venom of Agkistrodon acutus is a binding protein to activated coagulation factor X (FXa) and possesses marked anticoagulant activity. Single ACF I molecule has been successfully imaged in air by tapping mode atomic force microscopy (AFM) with high‐resolution using glutaraldehyde as a coupling agent. The physical adsorption and covalent binding of ACF I onto the mica show very different surface topographies. The former exhibits the characteristic strand‐like structure with much less reproducibility, the latter displays a elliptic granular structure with better reproducibility, which suggests that the stability of ACF I molecules on the mica is enhanced by covalent bonding in the presence of glutaraldehyde. A small‐scale AFM amplitude‐mode image clearly shows that the covalently bonded ACF I molecule by glutaraldehyde has olive shape structure with an average size of 7.4 nm × 3.6 nm × 3.1 nm, which is very similar to the size determined from the crystal structure of ACF I.
Study on the Phase Diagram of CsCl‐CeCl3‐HCl (11%)‐H2O System and the Properties of the Compounds
Authors: Wang Hui , Duan Jin‐Xia , Ran Xin‐Quan , Gao Shi‐Yang
Published: September 2010

The equilibrium solubility of CsCl‐CeCl3‐HCl (11%)‐H2O quaternary system at 25 °C has been determined by the physic‐chemical analysis method, and the phase diagram was plotted. Two new double salts 3CsCl · CeCl3 · 3H2O and CsCl · CeCl3 · 4H2O obtained from the complicated system were identified and characterized by XRD, TG‐DTA, DSC, UV and fluorescence spectroscopy. Studies on the fluorescence excitation and emission show that 3CsCl · CeCl3 · 3H2O and CsCl · CeCl3 · 4H2O have upconversion luminescence of infrared‐visible range, and the upconversion emission intensity increases with the increase of ratio of CeCl3 in CsCl.
Synthesis of Eu (III) and Tb (III) Complexes with Two New Amide Type Podands and Their Luminescence Properties
Authors: Zhang Jian , Tang Yu , Fan Jun , Cai Zheng‐Hong , Liu Wei‐Sheng , Tan Min‐Yu
Published: September 2010

Two new amide type podands L1 and L2 (L1 = 1, 1, 1‐tris {[(2‐benzylaminoformyl) phenoxyl] methyl} propane, L2 = 1, 3, 5‐trimethyl‐2, 4, 6‐tris {[(2‐benzylaminoformyl) phenoxyl] methyl} benzene) and their europium and terbium nitrates complexes were synthesized. The luminescence properties of these complexes were also studied.
Development of Highly Effective Nanoparticle Spinel Catalysts for Aerobic Oxidation of Benzylic Alcohols
Authors: Ji Hong‐Bing , Wang Le‐Fu
Published: September 2010

Spinel catalyst MnFe1.8Cu0.15Ru0.05O4 with particle size of about 42 nm is an effective heterogeneous catalyst for the oxidation of benzylic alcohols. The substitution of Fe for Cu improves its catalytic activity. Based on the characterization of BET, XPS and EXAFS, two factors influencing the structure and texture of the catalyst caused by the substitution of Cu for Fe may be assumed: physical factor responsible for the increasing of surface area; chemical factor responsible for the transformation of RuO bonds to RuO bonds. β‐Elimination is considered to be an important step in the reaction.
Ab initio Study on Enantioselective Reduction of Ketones Catalyzed by Thiazolidino [3, 4‐c ] oxazaborolidines
Authors: Li Ming , Xie Ru‐Gang , Han An‐Min
Published: September 2010

The ab initio molecular orbital method is employed to study the enantioselective reduction of acetophenone with borane catalyzed by thiazolidino [3, 4‐c] oxazaborolidine. Computation resuit shows that the controlling step for the reduction is the decomposition of the catalyst‐alkoxyborane adduct and the reduction leads to S‐alcohols. The transition state of the hydride transfer from the borane moiety to the carbonyl carbon of acetophenone is a twisted chair structure with a B (2)—N (3)—BBH3—HBH3—CCO—OCO 6‐membered ring.
One‐Dimensional Network Constructed by Salicylate and Phenanthroline Ligands with Copper (II)
Authors: Zhu Lag‐Guan , Cai Guo‐Qiang
Published: September 2010

A novel complex, [Cu2 (phen) (sal) (Hsal)2]n (1), was synthesized and structurally characterized. The base dimeric units are hold by sal ligands and extended into 1‐D network. The carboxylate groups of salicylates coordinate to the central ion in three different coordination modes: chelating, bridging and bridging‐chelating. In the case of bridging‐chelating of the carboxylate group of the salicylate, all three oxygen atoms of salicylate are bidentately coordinated to copper ion, namely, μ4‐η3 binding mode.
Chromatographic Characterization of Molecularly Imprinted Microspheres Synthesized by Aqueous Microsuspension Polymerization : Influences of pH, Kinds and Concentration of Buffer on Capacity Factors
Authors: Lai Jia‐Ping , Lu Chun‐Yang , He Xi‐Wen
Published: September 2010

Molecularly imprinted microspheres (MIMs) were prepared using 4‐aminopyridine (4‐AP) as template molecule by aqueous microsuspension polymerization. The MIMs were packed into stainless steel column (250 × 4.6 mm I. D.) for selective separation of 4‐aminopyridine (4‐AP) and 2‐aminopyridine (2‐AP). The influences of pH, kinds and concentration (c) of buffer on capacity factors were investigated in detail. The relationships of capacity factor (k′) with pH and concentration of buffer are quantitatively described firstly. The effects of pH of phosphate and acetate buffer on capacity factors are very different. The relationship between k′ and pH can be described by the following equation: k′ = −8.23 + 9.23 pH–0.99 pH2 (in phosphate buffer) with R2 = 0.9775 and k′ = 6.79–3.76 pH + 0.68 pH2 (in acetate buffer) with R2 = 0.9866. Furthermore, the capacity factors were also greatly affected by the concentration of acetate buffer in mobile phase while non‐imprinted molecule is poorly changed. It increases with decreasing the concentration of buffer—especially in low concentration buffer (cacetate < 0.02 mol/L, final concentration in mobile phase). The fit curve of log k′ to log c is described by equation: log k′ = −0.571–1.256 × log c −0.186 × (log c)2 with R2 = 0.9979. The ratio of acetate buffer to methanol was investigated and the optimal ratio for separation of 4‐AP and 2‐AP is below 1:7.5 (V/V).
Polyaniline/Prussian Blue Composite Film Electrochemical Biosensors for Cholesterol Detection
Authors: Li Jian‐Ping , Peng Tu‐Zhi
Published: September 2010

An electrochemical biosensor fabricated by immobilization of cholesterol oxidase (ChOx) in a polyaniline (PAN)/prussian blue (PB) conductive layer of glassy carbon electrode has been prepared, based on the detection of hydrogen peroxide produced by ChOx at ‐ 0.05 V. The properties of the biosensor were investigated and the measurement conditions for cholesterol were optimized. A linear relationship between electrochemical signal and cholesterol concentration in a range of 1 × 10−6‐8 × 10−5 mol/L was observed. It is one of the most sensitive sensors for cholesterol determination, since a low detection limit of 1.8 × 10−7 mol/L was found. Good properties of the biosensor were attributed to high activity of ChOx and effective electro‐catalysis of PB modifier in the composite layer on electrode surface.
O‐Maltosylation of Heterocyclic Ketene Aminals
Authors: Xu Zhan‐Hui , Huang Zhi‐Tang
Published: September 2010

The stereoselective synthesis of Ø‐maltosides by reacting benzoyl‐substituted heterocyclic ketene aminals 1 or 2 with acetylated maltosyl bromide 3 was investigated. Compounds 1 or 2 reacted with 3 in the presence of mercuric cyanide to give O‐maltosides 4 or 5 with E‐configuration. While 1 reacted with 3 in the presence of calcium hydride to give O‐maltosides 6 with Z‐configuration.
Enantiospecific Synthesis of All Four Stereoisomers of Novel Bicyclic Arylacetamides as k ‐Opioid Agonists
Authors: Long Ya‐Qiu , Mou Qi‐Yong , Qiu Da‐Ping , Wu Rui‐Qin
Published: September 2010

Conformationally constrained bicyclic derivatives of the potent and selective K‐opioid receptor agonist 2‐(3,4‐dichlorophenyl)‐N‐methyl‐N‐[(1S)‐1‐phenyl‐2‐(1‐pyrrolidinyl)‐ethlyl] acetamide (3, ICI‐199, 441) were designed to explore the effect of the conformational restriction and stereochemistry of the pharmacophoric ethylenediamine incorporated into the pyrrolidine on the affinity and K‐selectivity. A facile enantiospecific synthetic route was established to afford all four stereoisomers starting from readily available amino adds through mild cyclization and amide formation.
Synthesis of Hydrophobically Modified Poly (acrylic acid) Gels and Interaction of the Gels with Cationic/Anionic Surfactants
Authors: Tian Qin , Tang Xbo‐Ztai , Zhuang Dong‐Qing , Zhang Yun‐Xiang
Published: September 2010

Poly (acrylic add) (PAA) gel network with only chemical crosslinking and hydrophobically modified PAA (HM‐PAA) gets with both chemical and physical crosslinking were synthesized by radical polymerization in tert‐butanol, using ethylene glycol dimethacrylate (EGDMA) as crosslinker, and 2‐(N‐ethylperfluorooctanesulfoamido) ethyl methacrylate (FMA), stearyl acrylate (SA) or lauryl acrylate (LA) as hydrophobic comonomer respectively. The effect of the fractions and the species of the hydrophobes on swelling properties of HM‐PAA gels and the interaction of gels and surfactants were studied. The results showed that the swelling ratio of HM‐PAA gels exhibited a sharp decrease with increasing hydrophobic comonomer concentration, which could be ascribed to the formation of strong hydrophobic association among hydrophobic groups. It was proved that two kinds of binding mechanisms of surfactant/gel and different kinds of hydrophobic clusters existed in gels containing both physical and chemical networks.
Synthesis of Dendritic BINAP Ligands and Their Applications in Asymmetric Hydrogenation
Authors: Deng Guo‐Jun , Fan Qing‐Hua , Chen Xiao‐Min
Published: September 2010

A new type of chiral dendritic ligands with 2,2′‐bis(diphenylphosphino)‐1,1′‐binaphthyl (BINAP) located at the focal point of the dendrimer has been synthesized through the condensation reaction of 5‐amino BINAP and Fréchet‐type poly (aryl ether) dendrons with carboxyl groups as the linker in high reaction yields, respectively. The ruthenium complexes of these dendritic ligands were found to be very efficient catalysts in asymmetric hydrogenation of 2‐phenylacryclic acids as well as facile catalyst recycling.
A Short and Highly Stereoselective Synthesis of Cerebrosterol
Authors: Zhang Dong‐Hiri , Zhou Xiang‐Dong , Zhou Wei‐Shan
Published: September 2010

The title compound, cerebrosterol, has been synthesized in five steps with 61.5% overall yield and > 99.9% de from 3α, 6α‐dimethoxymethoxyl‐5P‐cholane‐24‐al as a key intermediate, which was prepared from methyl 3α, 6α‐dihydroxy hyodeoxy‐cholanate.
Cohesional Entanglement of Amorphous Polymer in Glass State as Probed by Equilibrium Swelling in a “Non‐Solvent”†
Authors: Yu Yan‐Sheng , Qian Ren‐Yuan
Published: September 2010

The equilibrium swelling of the system Polystyrene (PS) (M = 1.7 × 10s, monodisperse)/diethyl ether at 30 °C and 35 °C has been studied in detail in quiescent state for a time span over 150 d. Arguments are given to show that the swelling process in a “non‐solvent” is a network swelling rather than a phase separation process. It is different from the cloud point curve (CPC) experiment studied in literature, where the experiment starts from a one‐phase solution, so that the cohesional entanglement present in the solid polymer is disrupted by dissolution. The cohesional entanglement structure of the solid polymer, on the contrary, is retained in the concentrated phase on swelling, at least in the initial stage. The course of swelling as presented by the curve Va(t) was found to proceed in three stages, where Va is the volume of the concentrated phase. In the first and third stages of Va(t), the curve goes up smoothly, while in the second stage the curve Va(t) shows large up and down jumps, indicating probably a readjustment in the network structure. Some results on a monodisperse PS sample of M = 5.8 × 105 and a polydisperse sample of M = 2.0 × 105 are also given. The values of Va observed at swelling equilibrium are not in accord with the expected cloud point temperature. The cloud point curve represents a phase separation process occurring in local regions (space limited to μm) and in time scale of the order of minute, while the process Va(t) occurred in the whole space of the concentrated phase, in time scale of days. For quantitative characterization of the network present in the concentrated phase, a precise value of the polymer‐solvent interaction parameter x is needed.
Structures of Cytochrome b5 Mutated at the Charged Surface‐Residues and Their Interactions with Cytochrome c†
Authors: Wu Jlan , Wang Yun‐Hua , Gan Jian‐Hua , Wang Wen‐Hu , Sun Bing‐Yun , Huang Zhong‐Xian , Xia Zong‐Xiang
Published: September 2010

Glu44, Glu48, Ghi56 and Asp60 are the negatively charged residues located at the molecular surface of cytochrome b5. Two mutants of cytochrome b5 were prepared, in which two or all of these four residues were mutated to alanines. The mutations give rise to slightly positive shifts of the redox potentials of cytochrome b5 and obvious decrease of the cytochrome b5‐cytochrome c binding constants and electron transfer rates. The crystal structures of the two mutants were determined at 0.18 nm resolution, showing no alteration in overall structures and exhibiting slight changes in the local conformations around the mutation sites as compared with the wild‐type protein. Based on the crystal structure of the quadruple‐site mutant, a model for the binding of this mutant with cytochrome c is proposed, which involves the salt bridges from Glu37, Glu38 and heme propionate of cytochrome b5 to three lysines of cytochrome c and can well account for the properties and behaviors of this mutant.
Synthesis and Structure of Solvated Protons Incorporating Weakly Coordinating Anions. Precursors of Superacids†
Authors: Tsang Chi‐Wing , Yang Qing‐Chuan , Mak C. W. Thomas , Xie Zuo‐Wei
Published: September 2010

Six new solvated proton salts of highly halogenated carborane anions, [H(solvent),] [carborane] (carborane = 1‐R‐CB11‐Y5X6‐(R=H, Me; X, Y=CI, Br, I), 1‐H‐CB9Br9−) were prepared from the salt metathesis reaction of Ag(carborane) and HO in high yields. Single‐crystal X‐ray analyses show that they are all discrete molecules in the solid‐state. The number of the solvated molecules surrounding H+ ion can not be determined with the knowledge of the size and substituents of the carborane anions. These salts provide convenient weighable sources of Brønsted acid reagents having a wide range of acidities and good thermal stabilities. TGA results indicate that the solvated molecules (water or organic molecules) in the cations [H(solvent)n]+ can be removed under high temperature and high vacuum conditions to give superacidic materials H(carborane) which can protonate olefin.
Synthesis, Structure and Magnetic Properties of Two New Homotrinuclear Bis(oxamato) Copper (II) Complexes
Authors: Wang Qing‐Lun , Liao Dai‐Zheng , Yan Sm‐Ping , Jiang Zong‐Hui , Cheng Peng
Published: September 2010

Two new homotrinuclear copper (II) complexes with 1,3‐propylenebis(oxamato) (pba) and 2‐hydroxy‐l,3‐propylenebis(oxamato) (pbaOH): {[Cu(phen)]2[μ‐Cu(pba)](DMSO)2‐(H1O)}(ClO)4)2.E2O (1) and {[Cu(phen)]2[μ‐Cu(pbaOH)](DMSO)2(H2O)|(CIO4)2.0.5H2O (2) have been synthesized and their structures were determined. Both complexes have the similar homotrinuclear unit and give rise to the bistrinuclear entity through weakly coordinated bonds and π‐π interaction. The temperature magnetic susceptibilities for 1 and 2 were analyzed by means of the Hamiltonian Ȟ = ‐ 27 (ŠCnl ŠCua+ ŠCu1 ŠCu3), leading exchange integral J to be ‐ 105.6 and −107.3 cm−1 for 1 and 2, respectively.
Synthesis and Characterization of Novel Lanthanocene Complexes with Dichalcogenolate o‐Carboranyl Ligands
Authors: Yu Xiao‐Yan , Jin Guo‐Xin , Weng Lin‐Hong
Published: September 2010

Reactions of [Cp2Ln(μ‐Cl)]2 (Cp= η5‐C5H5, Ln = Nd, Yb, Dy, Gd, Er) with an equivalent of [(THF)3LiE2C2Bi0H10Li. (THF)]2 (E= S, Se) in THF afforded the dinuclear sandwich complexes of formula [CP2LnE2C2B10H10]2[LI(THF)4]2[E = S, Ln=Nd (1a), Yb (2a), Dy (3a), Gd (4a), Er (5a); E=Se, Ln=Nd (1b), Yb (2b), Dy (3b), Gd (4b), Er (5b)]. The molecular structures of complexes la, 2a and 2b were determined by the single crystal X‐ray structure analyses. Two lanthanide atoms are connected by a pair chalcogen (η1, η2‐E2C2B10H10) bridging ligands and the central Ln2E2 four membered ring is not planar.
An Unexpected Reaction of Allylic Propynoate under Palladium(II) Catalysis
Authors: Zhang Zhao‐Guo , Lu Xi‐Yan , Lang Shen‐Hui
Published: September 2010

Palladium (II) catalyzed reactions of allyl propynoate in the presence of excess halide ions with or without allyl halide or acrolein were studied, yielding (E)‐3‐halo‐2‐allyl‐acrylic acid as the sole product. A mechanism involving halopalladation, carbopalladation, ring opening and β‐heteroatom elimination was proposed and was further justified by the reaction with deuterated substrate.
Synthesis of Aminophosphine Ligands with Binaphthyl Backbones for Silver(I)‐catalyzed Enantioselective Allylation of Benzaldehyde†
Authors: Wang Yi , Ji Bao‐Ming , Ding Kui‐Liiig
Published: September 2010

A series of aminophosphine ligands was synthesized from 2‐amino‐2′‐hydroxy‐1,1′‐binaphthyl (NOBIN). Their asymmetric induction efficiency was examined for silver(I) catalyzed enantioselective allylation reaction of benzaldehyde with allyltributyltin. Under the optimized reaction conditions, quantitative yield as well as moderate ee value (54.5% ee) of product was achieved by the catalysis with silver(I)/3 complex. The effects of the binaphthyl backbone and the substitutes situated at chelating N, P atoms on enantioselectivity of the reaction were also discussed.
Protective Effects of Resveratrol and its Analogues against Free Radical‐Induced Oxidative Hemolysis of Red Blood Cells†
Authors: Fang Jian‐Guo , Lu Man , Ma Lan‐Ping , Yang Li , Wu Long‐Min , Liu Zhong‐Li
Published: September 2010

The in vitro oxidative hemolysis of human red blood cells (RBCs) was used as a model to study the free radical‐induced damage of biological membranes and the protective effect of resveratrol (3,5,4′‐trihydroxy‐trans‐stilbene, 1) and its analogues, i. e., 4‐hydroxy‐trans‐stilbene (2), 3, 5‐dihydroxytrans‐stilbene (3), 3,4‐dihydroxy‐trans‐stilbene (4), 4,4′‐dihydroxy‐trans‐stilbene (5) and 2, 4, 4′‐trihydroxy‐trans‐stilbene (6). The hemolysis of RBCs was induced by a water‐soluble free radical initiator 2, 2′‐azobis (2‐amidinopropane hydrochloride) (AAPH). It was found that addition of AAPH at 37 °C to the suspension of RBCs caused fast hemolysis after a short period of inhibition period, and addition of 1–6 significantly suppressed the hemolysis. Compound 4 which bears an ortho‐dihydroxyl functionality showed much more effective anti‐hemolysis activity than that of resveratrol and the other analogues.
Aerobic Oxidation of Methyl Vinyl Ketone in Supercritical Carbon Dioxide
Authors: Ouyang Xiao‐Yue , Jiang Huan‐Feng , Cheng Jin‐Sheng , Zhang Qun‐Jian
Published: September 2010

Aerobic oxidation of methyl vinyl ketone to acetal in supercritical carbon dioxide are achieved in high conversion and high selectivity when oxygen pressure reaches to 0.5 MPa. The effects of cocatalysts, additive, pressure and temperature of the reaction are studied in detail.
A New Synthetic Route to Diastereomerically Pure Cyclopropane‐Phosphorus Derivatives Utilizing the Chiron 5‐L‐Menthyloxy‐3‐bromo‐2(5H)‐furanone and Racemic Dialkyl α‐Hydroxyalkanephosphonate
Authors: Fan Xue‐E , Fu Yu‐Qin , Wang Jian‐Ge , Du Qiao‐Yun , Chen Qing‐Hua
Published: September 2010

A new chemical transformation for the construction of diversely functionalized cyclopropane‐phosphorus derivatives utilizing chiron 4 and racemic diethyl α‐hydroxylbenzylphosphonate as the key precursors is described. The diastereomeric pure phosphorus‐containing derivatives 5a, 5′a, 5b and 5′b were obtained respectively, in good yields with d. e. 98% via asymmetric tandem double Michael addition/internal nucleophilic substitution of the corresponding compounds and further through the separation of the diastereomeric mixture by column chromatography. The diversely functionalized phosphorus derivatives are identified on the basis of their elemental analysis and spectroscopic data, such as K, 1H NMR, 13C NMR and MS. The absolute configuration of the interesting cyclopropane‐phosphorus compound 5a was established by X‐ray crystallography. Thus, these results provide a valuable strategy for synthesizing some biologically active molecules.
Studies on Synthesis of a Cycloheptapeptide and Effects of Different Metal Ions on the Cyclization
Authors: Liu Mian , Ye Yim‐Hua
Published: September 2010

A cyclic heptapeptide, c(Gly‐Ile‐Pro‐Tyr‐Ile‐Ala‐Ala), which was isolated and identified from Stellaria yumumensis French (M), was synthesized by solution method for the first time. Protected heptapeptide Z‐Gly‐Ile‐Pro‐Tyr‐Ile‐Ala‐Ala‐OBzl was synthesized with 3‐(diethoxy‐phosphoryloxy)‐l,2,3‐benzotriazin‐4(3H)‐one (DEPBT) as a coupling reagent. After deprotection of benzyl and benzyloxycarbonyl groups, a free linear heptapeptide H‐Gly‐Ile‐Pro‐Tyr‐Ile‐Ala‐Ala‐OH was cyclized in DMF (2 × 10−3 mol/L) in the presence of nine different metal ions, i. e., Li+, Na+, K+, Cs+, Mg2+, Ca2+, Bai2+, Nr2+ and Cr5+ respectively, using DEPBT as a coupling reagent. Univalent metal ion Cs+ enhanced both the cyclization yield and cyclization rate of H‐Gly‐De‐Pro‐Tyr‐Ile‐Ala‐AlaOH, while some bivalent metal ions, such as Mg2+, Ca2+ and Ni2+ decreased the yields of c (Gly‐Ile‐Pro‐Tyr‐De‐Ala‐Ala) drastically. Trivalent metal ion Cr3+ even inhibited the cyclization reaction completely.
Enzymatic Synthesis of Dipeptide Derivatives Containing Noncoded Amino Acids in Organic Solvents†
Authors: Yang Hong , Zhou Oiuang , Tian Gui‐Ling , Ye Yun‐Hua
Published: September 2010

A series of dipeptide derivatives containing non‐coded amino acids, N‐Boc‐4‐X‐Phe‐Ala‐NHNHPh (X = Cl, Br, I, NO2), were synthesized by using thermoase in organic solvents. The physical data were consistent with the same samples prepared by 3‐(diethoxyphosphoryloxy)‐1, 2,3‐benzotriazin‐4 (3H)‐one (DEPBT). Influence of different substituted groups of the noncoded amino acids and different organic solvents on the enzymatic peptide synthesis was studied.
Synthesis of (+) or (‐)‐2‐(8′‐Diphenylphosphino‐1′‐naphthyl) oxazoline Ligands and Their Application in Pd‐Catalyzed Allylic Alkylation Reaction
Authors: Ma Sheng‐Ming , Duan De‐Hui
Published: September 2010

We synthesized optically active 2‐(8′‐diphenylphosphino‐1′‐naphthyl) oxazoline ligands by palladium‐catalyzed coupling reactions of (trimethylsilyl)diphenylphosphine with 2‐(8′‐bromo‐1'‐naphthyl)oxazolines, which, in turn, were prepared from 8‐bromo‐1‐naphthoyl chloride by the reaction with natural optical active amino alcohols. Pd‐Catalyzed allylic alkylation reaction induced by these chiral ligands gave the allylic substituted products in high yields and moderate ee values.
Regio‐ and Stereo‐selective Bioreduction of Diketo‐n‐butylphosphonate by Baker's Yeast
Authors: Wang Ke , Li Jin‐Feng , Yuan Cheng‐Ye , Li Zu‐Yi
Published: September 2010

A regio‐ and stereo‐selective reduction of diketo‐n‐butylphosphonates by baker's yeast was reported. The chemical yield and ee value of these reactions are highly dependent on the structure of substrates. The resulting optical active hydroxyalkanephosphonates can be used as chirons for the synthesis of polyfunctional organophosphorus compounds. As useful building block, a series of α, β‐unsaturated ketones bearing chiral hydroxy group in addition to trifluoromethyl moiety was prepared via the Homer‐Wadsworth‐Emmons (HWE) reaction of the biotransformation products.
Synthesis and Structure of a Novel Cluster with Trigonal‐bipyramidal Ge2Ru3 Core
Authors: Zhang Yong‐Qiang , Wang Bai‐Quan , Xu Shan‐Sheng , Zhou Xiu‐Zhong
Published: September 2010

When t‐BuC5H4Me2GeGeMe2C5E4Bu‐t and Ru3 (CO)12 were refluxed in nonane, a novel germanium‐ruthenium duster with a trigonal‐bipyramidal Ge2Ru3 core {(μ3‐Ge) [Ru(CO)2 (η5‐C5H4Bu‐t)]}2Ru3 (CO)9 (1) and a dinuclear ruthenium complex [(Me2Ge)(η5‐C5H3Bu‐t)Ru2(CO)6] (2) were obtained. The structures of 1 and 2 were fully characterized by 1H NMR, 13C NMR, IR spectra and elemental analysis, and 1 has also been determined by X‐ray diffraction analysis.
Synthesis and Catalytic Application of Homo‐bimetallic Metallocene Complexes as Ethylene Polymerization Catalysts
Authors: Feng Zuo‐Feng , Huang Ji‐Ling , Qian Yan‐Long , Sun Jun‐Quan , Chen Wei
Published: September 2010

Three new homo‐bimetallic metallocene complexes were prepared by RCpMCl3 (M= Ti, Zr) and Si‐bridged compounds, and were all well characterized structurally. These complexes with the methylaluminoxane (MAO) are highly active catalysts for the polymerization of ethylene. Compared to the polyethylene obtained by Cp2ZrCl2, the molecular weight (Mw = 78784–238021) of the polyethylene was higher and the molecular weight distribution (MwD = 2.10–2.44) was broader.
Syntheses and Characterizations of Novel One‐dimensional Coordination Polymers Self‐assembled from Co(NCS)2 and Flexible Diester‐bridged Pyridine‐based Ligands
Authors: Song Li‐Cheng , Zhang Wen‐Xiong , Hu Qing‐Mei
Published: September 2010

The self‐assembly reactions of Co(NCS)2 with diester‐bridged pyridine‐based ligands pyCO2‐(CH2)m‐O2Cpy (py = 4‐pyridyl; m = 2, 3, 4) have been studied. Interestingly, while Co(NCS)2 reacted with pyCO2‐(CH2)2‐O2Cpy (La) in MeOH/H2O or THF/MeCN to yield two coordination polymers [Co(NCS)2(La)2]n (1)and[Co(NCS)2(La)2‐2THF]n (2), reactions of Co(NCS)2 with pyCO2‐(CH2)3‐O2Cpy (Lb) in MeOH/MeCN and Co(NCS)2 with pyCO2‐(CH2)4‐Q2Cpy (Lc) in EtOH/H2O afforded [Co(NCS)2(Lb)20.5MeOH]n (3) and [Co(NCS)2(Lc)2‐2H2O]n (4), respectively. The X‐ray diffraction analyses indicated that polymers 1–4 consist of a one‐dimensional Co(II) chain in which each of the two adjacent Co(II) ions is bridged by two pyCO2‐(CH2)m‐O2Cpy ligands to form a macrocycle. In addition, the structures of polymers 1–4 were also characterized by infrared spectroscopy, thermogravimetry and elemental analysis.
Synthesis of [60]Fullerene‐Podophyllotoxin Derivative
Authors: Guo Li‐Wei , Gao Xiang , Zhang Dan‐Wei , Wu Sni‐Hur , Wu Hou‐Ming
Published: September 2010

The [60]fullerene‐podophyllotoxin derivative (3) was obtained by the phosphine promoted [2 + 3] cycloaddition reaction of podophyllotoxin buta‐2,3‐dienoate (2) and [60]fullerene. The structures of starting material (2) and product (3) were confirmed by UV‐vis, IR, NMR and MS spectroscopies.
Preparation of Lanthanide Hydrides of Nanometric Size by the Catalytic Method
Authors: Fan Yin‐Heng , Wu Mei‐Xia , Wu Qiang , Liao Shi‐Jian , Xu Jie
Published: September 2010

Rare‐earth metals were hydrogenated in the presence of TICI4 catalyst in tetrahydrofuran (THF) at 45 °C under normal pressure. Transmission electron micrographs showed that the resulting lanthanide hydrides were in the form of nanoparticles. The rate of hydrogenation decreased with increasing atomic number of the rare‐earth elements.
Hypervalent Iodine in Synthesis 64: Syntheses of Diaryl Selenides and Alkyl Aryl Selenides by Palladium‐Catalyzed Arylation of Areneselenyl or Alkaneselenyl Magnesium Bromide with Diaryliodonium Salt
Authors: Wang Li , Chen Zhen‐Chu , Zheng Qin‐Guo
Published: September 2010

Areneselenyl or alkaneselenyl magnesium bromide reacts rapidly with diaryliodonium salt to give the corresponding diaryl or alkyl aryl selenide in the presence of catalytic amounts of Pd‐(PPh3)4 in good yield.
Tandem Reaction of Deprotonation‐Oxidation‐Wittig Reaction: Stereoselective Synthesis of (E) ‐α, β‐Unsaturated Enoates
Authors: Huang Zhi‐Zhen , Sun Ruo‐Jun
Published: September 2010

Phosphonium or arsonium salt with primary alcohol can undergo the tandem reaction of deprotonation‐oxidation‐Wittig reaction in the presence of sodium hydroxide and manganese dioxide, providing a general and efficient method for the stereoselective synthesis of (E) ‐α, β‐unsaturated enoates.
An Efficient Mg/Sml2 Catalytic System for the Intermolecular Deoxygenative Coupling of Amides and Ketones
Authors: Xu Xiao‐Liang , Zhang Yong‐Min
Published: September 2010

The intermolecular deoxygenative coupling of ketones with amides induced by Mg/Sml2 catalyst was studied and a series of enamines was synthesized in moderate yields under mild and neutral conditions.
Self‐assembled Monolayers of n‐Hexadecanoic Acid and α‐Hydroxyl n‐Hexadecanoic Acid on Titanium Surfaces
Authors: Chen Hai‐Gang , Wu Xue‐Dong , Yu Qin‐Qin , Yang Sheng‐Rong , Wang Da‐Pu , Seen Wen‐Zhong
Published: September 2010

n‐Hexadecanoic acid (HA) and α‐hydroxyl n‐hexadecanoic add (HHA) are shown to spontaneously assemble on Si‐supported titanium surfaces. Contact angle measurements, reflection absorbance IR, AFM and XPS characterizations are performed to examine the physical and chemical states of attached monolayers. The results show that the two amphiphiles tend to form disordered monolayers on titanium surfaces. The HHA headgroups are believed to form polydentate coordination with Ti, which is more chemically stable than the bidentate coordination of HA. All the facts of characterization indicate that HHA monolayer has more surface coverage than HA monolayer.
A Novel Self‐assembled Supramolecular Complex {[Cu(n) (en)2·H2O] [Cu(I)2(CN)4]}n with Honeycomb‐like Structure and Its Adsorption Properties
Authors: Shen Xiao‐Ping , Zou Jian‐Zhong , Li Bao‐Long , Hu Huai‐Ming , Xu Zheng
Published: September 2010

A novel supramolecular complex {[Cu(n)(en)2·H2O]·[Cu(I)2(CN)4]}n (en = ethylenediamine), in which the cyanide‐bridged Cu(I) forms the honeycomb‐like skeleton host and the Cu(n) complex ion [Cu(en)2·H2O]2+ is encapsulated in the center of the channel cavity of the skeleton, was synthesized by two different methods. The complex was also characterized by elemental analysis, ICP analysis, IR spectra and thermal analysis. The adsorption and desorption studies of the complex indicate that H2O and NH3 can be desorbed and re‐adsorbed without collapse of the channel structure of the supramolecule.
Chemoselective Benzylation and Allylation of 4‐Nitrobenzaldehyde Promoted by Phase Transfer Catalyst and Metal in Aqueous Media
Authors: Zha Zheng‐Gen , Xde Zhen , Zhou Cun‐Liu , Wang Zhi‐Yong , Wang Yu‐Song
Published: September 2010

The benzylation and allylation of 4‐nitrobenzaldehyde (1) could be controlled chemoselectively by using different phase transfer catalyst (FTC) and different metal catalysts. And then, benzylation and allylation of 1 with various organic halides has been realized in high yields in aqueous media.
Study on Oxidation Mechanism of Nitrogen Monoxide in Indoor Environment
Authors: Zheng Dan , An Cong‐Jim , Yang Bo , Ding Zong‐Zhou
Published: September 2010

With the aid of wind‐tunnel experimental setup, the possibilities that nitrogen monoxide (NO) is oxidized to nitrogen dioxide (NO2) in various environments were studied, which include indoor, outdoor and darkroom conditions. By comparing their effects, a conclusion can be drawn that NO can be oxidized to NO2 in indoor environment with a low rate, and micro amount of ozone, propylene and methane can accelerate the reaction: 2NO+ O2·NO2. The initial concentration of NO has effect on the oxidation rate. When the initial concentration of NO ranges between 500 and 900 μg/L, natural logarithm of initial rate and natural logarithm of initial concentration have a good linear relation, so do m(1/[NO]) and the time (t). Besides mat, the possible oxidation mechanism of indoor NO has also been studied.
Study on the Model for Regulation of the Allosteric Enzyme Activity
Authors: Li Qian‐Zhong , Luo Liao‐Fu , Zhang Li‐Rong
Published: September 2010

The effects of activator molecule and repressive molecule on binding process between allosteric enzyme and substrate are discussed by considering the heterotropic effect of the regulating molecule that binds to allosteric enzyme. A model of allosteric enzyme with heterotropic effect is presented. The cooperativity and anticooperativity in the regulation process are studied.
Synthesis and Characterization of 2,6‐Bis(imino)phenoxy Cobalt Complexes
Authors: Han Ling‐Qin , Sun Wen‐Hua , Wang Le‐Yong , Shao Chang‐Xing , Wang Hong‐Gen , Li Ji‐Tai
Published: September 2010

A series of cobalt complexes bearing 2,6‐bis(imino) phenoxy ligands, LCoCl2[L = 2,6‐(ArNCH)2CH3C6H2OH] was synthesized by the reaction of the ligand 2,6‐bis (imino) phenol with the equivalent mole of cobalt dichloride, and these complexes were characterized by elemental analyses,1H NMR, MS and IR spectra. The structure of one complex was determined by single crystal X‐ray diffraction analysis.