bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis of New Ruthenium (II) Bipyridyl Complexes and Studies on Their Photophysical and Photoelectrochemical Properties
Authors: Lin‐Qing Song , Pu. Hui Xie , Xue‐Song Wang , Yuan‐Jun Hou , Bao‐Wen Zhang , Yi Cao , Wei‐Ying Li , Jing‐Bo Zhang , Xu‐Rui Xiao , Yuan Lin
Published: September 2010

Two new mixed‐ligand ruthenium(II) complexes, Ru(dcbpy)‐(LL) (NCS)2[where dcbpy = 4, 4′‐dicarboxyl‐2,2′‐bipyridine, LL = 4,4′‐bis (N‐methyl‐anilinomethyl)‐2,2′‐bipyridine (1) or 4‐methyl‐4′‐N‐methyl‐anilinomethyl‐2,2′‐bipyridine (2)], were synthesized, and the photophysical properties of these complexes were studied. The metal‐to‐ligand charge transfer (MLCT) transitions of these complexes exhibited solvatochromic effect due to the existence of NCS ligands. The MLCT energies also strongly depend on the pH values of the solutions because of protonation and deprotonation of the carboxyl groups. The pKa, values of the ground state, 4.0 for 1 and 3.8 for 2, were obtained from the titration curves. The photoelectrochemical properties of 1 and 2 as sensitizers in sandwich‐type solar cells have been studied. Complex 1 exhibited better photoelectrochemical behavior than complex 2 as expected. It was proved that the design of mixed‐ligand complex by introducing electron donating group in one of the ligands should be a promising approach.
Synthesis, Crystal Structure of Cis‐dioxo‐catecholatotungsten(VI) Complex and Its NMR Studies on the Interaction with ATP
Authors: Xiao‐Ming Lu , Shun‐Cheng Liu , Ling Jiang , Xi‐An Mao , Zhao‐Hui Ye
Published: September 2010

Cis‐dioxo‐catecholatotungsten(VI) complex anion [W(VI)O2‐(OC6H2O)]2‐was obtained with discrete protonated ethylene‐diamine (NH2CH2CH2NH3)+ cations by the reaction of tetra‐butyl ammonium decatungstate with catechol in the mixed solvent of CH3OH, CH3CN and ethylenediamine, and compared with its molybdenum analogue [Mo(v)O2(OC6H4O)2]3‐by crystal structure, UV, EPR. The results of the UV and EPR spectra show that tungsten is less redox active than molybdenum since the molybdenum is reduced from Mo(VI) to Mo(V) but tungsten stays in the original highest oxidized state Mo (VI) when they are crystallized from the solution above. It is worthy to note that [W(VI)O2(OC6H4O2)]2‐shows the same coordination structure as its molybdenum analogue in which the metal center exhibits distorted octahedral coordination geometry with two cis‐dioxocatecholate ligands and might have the related coordination structure feature with the cofactor of flavoenzyme because [Mo(v)O2(OC6H4O)2]3‐presented essentially the same EPR spectra as flavoenzyme. The NMR studies on the interaction of the title complex with ATP reveal that the reduction of W(VI) to W(V) occurs when the title complex is dissolved in D2O and the W (V) is oxidized again when ATP solution is mixed with original solution and the hydrolysis of the catechola‐to ligand take places at mean time being monitored by 1H NMR and 13C NMR spectra.
Stereocontrol of the Schiff Base of Substituted Benzaldehyde to Staudinger Cycloaddition Reaction
Authors: Chuan‐Min Qi , Ling‐Chun Yang , Peng‐Li Sun
Published: September 2010

Syntheses of 4 novel chiral azetidin‐2‐one derivatives, which were characterized by 1H NMR, ER, specific rotation and elemental analysis, through Staudinger cycloaddition reaction of Schiff base of benzaldehyde with chlorine substitution at different position in benzene ring, were described. For the first time, this type of 3S, 4R configuration azetidin‐2‐one mono‐crystals with many chiral centers [(3S,4R)‐3‐hydroxy‐N‐[(S)‐(1‐phenyl)ethyl]‐4‐(2′‐chlorophenyl)‐azetidin‐2‐one mono‐crystal] were obtained, the structures of which were determined by X‐ray diffraction analysis. The effects of Schiff base of benzaldehyde with chlorine substitution at different position in benzene ring on stereoselectivity of Staudinger cycloaddition reaction products were discussed and the results are showed as below: 2‐chlorophenyl Schiff base favored to yield 3S.4R configuration product, but 4‐chlorophenyl Schiff base favored to yield 3S,4S configuration product. The reaction orientation of 2,4‐dichlorophenyl Schiff base was determined by corporate effect of 2‐and 4‐chlorine, and that of the 4‐chlorine was more obvious. In contrast to 4‐chlorophenyl, although the main product was 3R, 4S configuration, 3‐chlorophenyl owned lower selectivity.
Calix[6]arene‐bismetalloporphyrins as Enzyme Models for P450 V. Catalytic Performance in Epoxidation of Styrene
Authors: Dong‐Hong Li , Shu‐Hua Chen , Hua‐Ming Zhao
Published: September 2010

In this paper the catalytic performance of the calix [6]arene‐bis‐metalloporphyrins in the epoxidation of styrene was studied. The influence of phase transfer catalyst, pH value, buffer a‐gent, substrate concentration, substituent on the benzene ring of porphyrin, and the central metal ion, etc., on the reaction rates were investigated meticulously. The results showed that the calix [6] arene‐bismetalloporphyrins had a much higher catalytic activity than that of the corresponding metalloporphyrins.
Microwave‐enhanced Mannich Condensation of Terminal Alkynes, Primary Amines with Paraformaldehyde on Cuprous Iodide Doped Alumina under Solvent Free Conditions
Authors: 'Lei Wang , Pin‐Hua Li
Published: September 2010

A microwave‐enhanced, solventless Mannich condensation of terminal alkynes, primary amines with paraformaldehyde on cuprous iodide doped alumina has been investigated. The structures of products depend on the ratio of alkyne to amine and paraformaldehyde.
Diiodination of Alkynes in Supercritical Carbon Dioxide
Authors: Jin‐Heng Li , Ye‐Xiang Xie , Du‐Lin Yin , Huan‐Feng Jiang
Published: September 2010

A general, green and efficient method for the synthesis of trans‐diiodoalkenes in CO2 (sc) has been developed. Trans‐diiodoalkenes were obtained stereospecifically in quantitative yields via diiodination of both electron‐rich and electron‐deficient alkynes in the presence of KI, Ce(SO4)2 and water in supercritical carbon dioxide [CO2(sc)] at 40 °C.
Ion Channel Behavior of a Supported Bilayer Lipid Membrane Composed of 5,5‐Ditetradecyl‐2‐(2‐trimethyl‐ammonioethyl)‐1,3‐dioxane Bromide Modified Glassy Carbon Electrode
Authors: Gong Jing‐Ming , Lin Xiarig‐Qin
Published: September 2010

A synthetic cationic surfactant, 5,5‐ditetradecyl‐2‐(2‐trimethyl‐ammonioethyl)‐1,3‐dioxane bromide (DTDB), was used to construct a supported bilayer lipid membrane (s‐BLM) coated on an underlying glassy carbon electrode (GCE). Electrochemical impedance spectroscopy (EIS), small‐angle X‐ray diffraction (SAXD) and cyclic voltammetry were used to characterize the s‐BLM. Both EIS and SAXD data indicated that the synthetic lipid exists as a well‐oriented bilayer in the membrane. The voltammetric study showed that the lipid membrane can open ion channels in the presence of ClO4−stimulant with Ru(bpy)2/3+ as marker ions and give distinct channel currents. The channels can be closed and open up again many times by removing or introducing ClO4−anions.
Chiral Guanidine Catalyzed Annulation to the Core Structure of (‐)‐Huperzine A
Authors: Pan Qiang‐Biao , Ma Da‐Wei
Published: September 2010

A bridged bicyclic compound (7), the key intermediate for the synthesis of (‐)‐huperzine A (1), was prepared by diastereoselective Michael‐aldol annulation of β‐keto ester (4) catalyzed by chiral guanidine (2). A variety of chiral catalysts, substrates and reaction conditions were tested.
Comparison of (η6‐Fluoroarene)tricarbonylchromium Complexes with Their Chloro‐analogs in Radical Aromatic Substitutions
Authors: Lin He‐Chun , Yang Li , Li Chao‐Zhong
Published: September 2010

Reactions of fluoroarene‐Cr(CO)3 complexes with SmI2 and carbonyl compounds in THF/HMPA at‐40–60°C afforded the corresponding radical aromatic substitution products in high yield. Compared to the corresponding chloroarene‐Cr(CO)3 complexes, fluoroarene‐Cr(CO)3 complexes showed a higher efficiency and slightly lower regioselectivity.
Application of DEPBT on the Synthesis of the Protected Dipeptides Containing Histidine with Unprotected Imidazole Group by Solution Method
Authors: Shen Hong‐Yan , Tian Gui‐Ling , Zhu Wen‐Jiang , Ha Sha , Ye Yun‐Hua
Published: September 2010

3‐(Diethoxyphosphoryloxy)‐1, 2, 3‐benzotriazin‐4(3H)‐one (DEPBT) was an organophosphorus coupling reagent developed by our group. It was an effective coupling reagent for the synthesis of protected peptides containing Tyr, Ser and Thr with unprotected hydroxy group on their side chain. The further study of the synthesis of a series of protected dipeptides containing histidine with unprotected imidazole group using DEPBT is reported. During the synthetic procedure, the imidazole group of histidine did not need to be protected. When the carboxyl components were N‐protected aromatic amino acids or basic amino adds, the yields were relatively high (63%—81%). However, when the carboxyl components were N‐protected acidic amino adds, the yields were relatively low (47%—48%). The results expanded the application of DEPBT on the synthesis of bioactive peptides containing histidine.
Candida rugosa Lipase‐catalyzed Kinetic Resolution of Hydroxy‐alkanephosphonates
Authors: Zhang Yong‐Hui , Xu Cheng‐Fu , Li Jin‐Feng , Yuan Cheng‐Ye
Published: September 2010

An efficient lipase‐catalyzed enantioselective hydrolysis of butyryloxyalkanephosphonates in water‐equilibrated diisopropyl ether was developed. The relationship between the substrates'structure and the reactivity, as well as the enantioselectivity of this enzymatic transformation was studied. The catalytic preference of crudeCandida rugosalipase toward such molecules was assigned according to modified Mosher's method and X‐ray crystallographic analysis. Optically pure 2‐hydroxy‐2‐arylethanephosphonates, 3‐hydroxy‐3‐phenylpropanephosphonate, and 3,3, 3‐trifluoro‐2‐hydroxypropanephosphonates were conveniently prepared in this manner.
Studies on the Model Synthesis of the Brassinolide and Dolicholide's Side Chains
Authors: Peng Li‐Zeng , Zhang Feng‐Zhi , Mei Tian‐Sheng , Zhang Tao , Liu Hua‐Wei , Li Yu‐Lin
Published: September 2010

A highly stereoselective synthesis of the side chain enantiomers of brassinolide and dolicholide through an aldol reaction of 2‐(4‐methoxy benzyloxyl) propionylaldehyde (5) with the anion of 1‐(tert‐butyldimethylsiloxy)‐3‐methyl‐2‐butanone (6) is described.
A New and Practical Procedure for the Preparation of the Glucohexatose Phytoalexin Elicitor
Authors: Wang Hai‐Rong , Li Zhao‐Long , Ning Jun , Kong Fan‐Zuo
Published: September 2010

The phytoalexin elicitor β‐(1→3)‐branched β‐(1→6)‐linked glucohexatose has been regio‐and stereospecifically synthesized by coupling of the 3, 6‐branched gluco‐trisaccharide Schmidt reagent 10 with a mixture of multiol) 3, 6‐branched gluco‐trisaccharides 13 which consists of free 5, 6′‐OH trisaccharide, free 5,2′, 6′‐OH trisaccharide, free 5,3′,6′‐OH trisaccharide and so on. The compounds 10 and 13 were prepared from 1,2:5,6‐di‐O‐isopropylidene‐α‐D‐glucofuranose, 2, 3, 4, 6‐tetra‐O‐ben‐zoyl‐α‐D‐glucopyranosyl trichloroacetimidate, and 2, 3, 4, 6‐tetra‐O‐acetyl‐α‐D‐glucopyranosyl trichloroacetimidate through regio‐and stereoselective manners.
Synthesis of Chiral Aminophenols Based on Proline and Their Application in Enantioselective Addition of Diethylzinc to Aldehydes
Authors: Ge Jian‐Feng , Shen Zong‐Xuan , Zhang Ya‐Wen , Lu Xin‐Hua , Lu Zhong‐E
Published: September 2010

Three 2‐{(3R, 7aS)‐1, 1‐disubstituted‐tetrahydro‐1H‐pyrrolo [1, 2‐c] [1, 3] oxazol‐3‐yl} phenols have been synthesized from salicylaldehyde and amino alcohols derived from L‐proline, and used as ligands in enantioselective addition of diethylzinc to aldehydes, the ee values of obtained secondary alcohols were found in the range of 0–90%.
Using Natural Cinchona Alkaloids to Promote the Enantioselective Addition of Dialkylzinc to N‐Diphenylphosphinylimines
Authors: Zhang Hai‐Le , Fang Chun‐Mei , Li Xin , Gong Liu‐Zhu , Mi Ai‐Qiao , Cui Xin , Jiang Yao‐Zhong
Published: September 2010

Cinchona alkaloids are utilized as chiral ligands to promote the enantioselective addition of dialkylzinc to N‐diphenylphosphinylimines affording enantiomerically enriched N‐diphenylphosphinylamines in up to 91% ee.
Fabrication of Dendrimer‐like PAMAM Based on Silica Nanoparticles
Authors: Liu Peng , Tian Jun , Liu Wei‐Min , Xue Qun‐Ji
Published: September 2010

A G 4.0 dendrimer‐like poly(amido amine) (PAMAM) based on silica nanoparticles was fabricated via a divergent approach. It was built from γ‐aminopropyl silica nanoparticles (APSN) core via repetitive addition of acrylate (MA) and hexylenediamine (HDA). FT‐IR and EA were used to monitor the progress of dendrimer during each step. The amino group content of the resulting product increased from 0.49 to 3.72 mmol/g after the 4th generation. In addition, the percentage of grafting increased with increasing generation and reached to 65.9% after 4th generation. It was found that the resulting silica nanoparticles could be dispersed in methanol with a mean hydrodynamic particle diameter of 152.7 nm although the silica nanoparticles had agglomerated during the storage period.
Isolation and Purification of a Novel Long‐chain Acyl Catechin from Lipophilic Tea Polyphenols
Authors: Chen Ping , Du Qi‐Zhen
Published: September 2010

Lipophilic tea polyphenols (LTP) was prepared by esterification of green tea polyphenols (GTP) with hexadecanoyl chloride. A novel long‐chain acyl catechin was isolated and purified from LTP by high‐speed countercurrent chromatography (HSCCC). Its molecular structure was elucidated as epigallocatechin‐3‐O‐gallate‐4′‐O‐hexadecanate by elemental analysis, IR, MS and 1H NMR spectra.
Synthesis and Structural Characterization of Three New Inorganic “Host‐guest” Polyoxomolybdates
Authors: Wen‐Bin Yang, , Can‐Zhong Lu, , Hong‐Hui Zhuang,
Published: September 2010

Since two interesting inorganic “host‐guest” polyoxomolybdates 1 and 2 have been reported previously, we have now succeeded in selectively isolating three new acetated “host‐guest” polyoxomolybdates 3–5, which considerably extend the range of structures in the cyclic polyoxomolybdate catalogue. 3 crystallizes in the triclinic space group P‐1 with a = 1.22235(1) nm, b = 1.52977(2) nm, c = 1.54022(1) nm, a = 113.746(1)°, β = 96.742(1)°, γ = 101.564(1)°, V = 2.51892(4) nm3, Z =1, Dc = 2.568 g. cm−3. 4 and 5 crystallize in the monoclinic system: P2(1)/n, a = 1.08298(2) nm, b = 1.54029(1) nm, c = 2.78893(5) nm, β =94.2730(10)°, V = 4.63929(12) nm3, Z = 2 and Dc = 2.671 g. cm−3 for 4, and C2/c, a =2.59907(8) nm, b = 1.65992(3) nm, c = 2.28473(7) nm, β‐93.4370(10)°, V = 9.8392(5) nm3, Z = 4 and Dc = 2.556 g. cm−3 for 5. The structures of 3, 4 and 5 consist of 18‐membered “host‐guest” polyoxoanions [ Na (X)2| ∈ |(μ3‐OH)4Moy8MoVI1052(μ2‐CH3COO)2]−(R+9 (X = CH3COO−for 3, DMF for 4 and H2O for 5), which are connected via Na* ions or hydrogen bonds into infinite extended frameworks.
Exact Mass Measurements for α‐Allenic Alcohol by Atmospheric Pressure Chemical Ionization/Time‐of‐flight Mass Spectrometry
Authors: Ping He , Yin‐Long Guo , Guo‐Qiang Chen , Dai‐Wang Xu , Sheng‐Ming Ma
Published: September 2010

The atmospheric pressure chemical ionization/time‐of‐flight mass spectrometry (APCI/TOF‐MS) was applied to determine the mass of five α‐allenic alcohols via their protonated molecular ions using positive ion mode. Polyethylene glycol (PEG) was used as the internal reference. All results were obtained under the resolution of about 5000 FWHM (full width at the half maximum). Solvent effects were studied and the satisfied results were obtained in acetonitrile. Compared with the theoretical values, all absolute errors were less than 1.0 mmu. The effects of nozzle potential, push pulse potential, pull pulse potential, pull bias potential and acquisition rate on exact mass determination were also discussed. APCI/TOF‐MS is proven to be a very sensitive analytical technique and an alternative ionization mode in analyzing thermally labile compounds with relatively weak polarity, such as α‐allenic alcohol.
Enantioselective Conjugate Addition of Diethylzinc to Chalcone Catalyzed by Ni(acac)2 and Chiral β‐Amino Alcohols
Authors: Heng‐Shan Wang , Rui Wang , Chao‐Shan Da , Zhuo‐Qun Xin , Wu Su , Yi‐Nan Xiao , Da‐Xue Liu
Published: September 2010

Enantioselective conjugate addition of diethylzinc to chalcone was carried out in the presence of Ni(acac)2 complexed with five pyrrolidinylmethanols derived from L‐proline. (S)‐N‐Benzyl‐2‐(1‐hydroxy‐1‐methylethyl) pyrrolidine was found to be the best ligand in asymmetric conjugate addition among the five ligands. The products were obtained with up to 70% ee. The configuration of the product was determined jointly by the substituents on the carbon of the hydroxy group and the nitrogen atom.
Exact fixed‐node quantum monte carlo: Self‐optimizing procedure
Authors: Huang Hong‐Xin
Published: September 2010

In this paper, a novel exact fixed‐node quantum Monte Carlo (EFNQMC) algorithm was proposed, which is a self‐optimizing and self‐improving procedure. In contrast to the previous EFNQMC method, the importance function of this method is optimized synchronistically in the diffusion procedure, but not before beginning the EFNQMC computation. In order to optimize the importance function, the improved steepest descent technique is used, in which the step size is automatically adjustable. The procedure is quasi‐Newton type and converges super linearly. The present method also uses a novel trial function, which has correct electron‐electron and electron‐nucleus cusp conditions. The novel EFNQMC algorithm and the novel trial function are employed to calculate the energies of 1 1A1 state of CH2, 1A1 state of C8 and the ground‐states of H2, LiH, Li2 and H2O.
Effect of processing and aging on particle size of explosives
Authors: Shu Yuan‐Jie , Liu Shi‐Jun , Dong Hai‐Shan , Hao Ying , Zhan Chun‐Hong , Chen Jie
Published: September 2010

Influence of such processes as molding powder production, pellets pressing and aging under different conditions on particle size of TATB (1,3,5‐triamino‐2,4,6‐trinitrobenzene) and HMX (cyclotetramethylenetetranitramine) was experimentally studied. The results showed that particle size of these explosives was greatly changed before and after molding powder production, but for different size grade of explosive this change was not the same; pressing process had also great effect on explosive particle size, but before and after ageing process explosive particle size did not change seriously.
Multi‐objective modeling and assessment of partition properties: A GA‐based quantitative structure‐property relationship approach
Authors: Yin Chun‐Sheng , Liu Xin‐Hui , Guo Wei‐Min , Liu Shu‐Shen , Han Shuo‐Kui , Wang Lian‐Sheng
Published: September 2010

In this work a multi‐objective quantitative structure‐property relationship (QSPR) analysis approach was reported based on the study on three partition properties of 50 aromatic sulfur‐containing carboxylates. Here multi‐objectives (properties) were taken as a vector for QSPR modeling. The quantitative correlations for partition properties were developed using a genetic algorithm‐based variable‐selection approach with quantum chemical descriptors derived from AMl‐based calculations. With the QSPR models, the aqueous solubility, octanol/water partition coefficients and reversed‐phase HPLC capacity factors of sulfur‐containing compounds were estimated and predicted. Using GA‐based multivariate linear regression with cross‐validation procedure, a set of the most promising descriptors was selected from a pool of 28 quantum chemical semi‐empirical descriptors, including steric and electronic types, to integrally build QSPR models. The selected molecular descriptors included the net charges on carboxyl group (Qoc), the 2nd power of net charges on nitrogen atoms (Q2N), the net atomic charge on the sulfur atoms (Qs), the van der Waals volume of molecule (V), the most positive net atomic charge on hydrogen atoms (QH) and the measure of polarity and polarizability (π), which were main factors affecting the distribution processes of the compounds under study. The statistically best QSPR models of six descriptors were simultaneously obtained by GA‐based linear regression analysis. With the selected descriptors and the QSPR equations, mechanisms of partition action of the Sulfur‐containing carboxylates were able to be investigated and interpreted.
Design of agents interacting with immunoregulating proteins: Potential inhibitors of the phenylpyruvate tautomerase activity catalysed by macrophage migration inhibitory factor (MIF)
Authors: Carpy J. M. Alain , Haasbroek P. P. , Oliver D. W.
Published: September 2010

The macrophage migration inhibitory factor has been implicated in a number of immune and inflammatory processes. MIF presents particular opportunities for drug design and development with potential therapeutic applications. Drug design strategies taking into consideration of specific stereochemical and tautomeric requirements in the interaction of MIF with substrates and inhibitors allow several novel structures to be designed. Our investigations successfully explored the tautomeric and stereochemical aspects of new compounds of the 2‐phenylpyruvic acid type, both experimentally, through synthesis and structural investigations and computationally, through molecular mechanics and quantum mechanics calculations1.
Synthesis, structure and photoluminescence of two zinc carboxylate polymers with different coordination architectures
Authors: Ding Hong , Chen Wei , Yue Qi , Chen Jie‐Sheng , Wang Su‐Ning
Published: September 2010

The hydrothermal reaction of ZnO with benzene‐1,4‐dicarboxylic add gave Zn·BDC·2H2O (1) and Zn‐BDC·H2O (2) (BDC = benzene‐1, 4‐dicarboxylate), respectively. Polymer 1 (C4H4O3ZH0.5) shows a one‐dimensional zigzag chain structure built up from the alternate connection of tetrahedral ZnO4 and BDC units. Polymer 2 (C4H3O2.5Zn0.5) possesses a three‐dimensional framework containing infinite zigzag Zn·Zn·Zn pseudochains generated by five‐coordinate zinc centers and a rectangular channel system including three groups of different straight channels along the [001], [010] and [60–1] directions. The two metal‐organic polymeric compounds exhibit strong photoluminescent emission bands at 402 nm (λex = 260 nm) (for 1) and at 344 nm and 385 nm (λex = 279 nm) (for 2) in the solid state at room temperature.
A study of the relation between current oscillations and pitting
Authors: Ma Hou‐Yi , Yin Bing‐Sheng , Li Gui‐Yan , Guo Wen‐Juan , Chen Shen‐Hao , Tang Kai
Published: September 2010

Anodic polarization behaviors of iron in pure H2SO4 and three mixed acidic solutions, H2SO4 + NaCl, H2SO4 + NaNO3 and H2SO4+ NaCl + NaNO3, were investigated. The potentiodynamic sweep curves showed that the current densities rose and dropped irregularly in H2SO4 + NaCl solution at the more anodic potentials since the iron surface suffered pitting attack in the solution, but the pitting corrosion was inhibited effectively in the presence of nitrate ions. The surface morphological measurements indicated that pits appeared on the iron surface in H2SO4 + NaCl solution and only a few unobvious corrosion spots were observed in H2SO4 + NaCl + NaNO3 solution after the iron electrode was potentiostatically polarized at 1.3 V. The oscillatory properties of iron are associated with the susceptibility of the iron to pitting. In H2SO4 + NaCl solution, the regular potentiostatic current oscillations gradually evolved into the irregular current fluctuations due to occurrence of the pitting; whereas in H2SO4 + NaCl + NaNO3 solution, the current oscillations took place regularly, like the oscillatory behavior in the pure H2SO4 solution. Thus, when the higher the oscillatory frequency, the more irregular oscillatory process and the more sensitive to pitting iron occurred.
Investigations on preparation, crystal structure and thermal stability of bis (O‐ethylcarbonodithiolato‐S, S′) (1,10‐phenanthroline‐N1, N10) cobalt(II) complex: [Co(Et‐XA)2· phen] ± H2O (XA = xanthate)
Authors: Jian Fang‐Fang , Li Yan , Wang Huan‐Xiang , Jiao Kui
Published: September 2010

[Co(Et‐XA)2· phen] ± H2O was prepared by adding 1,10‐phenanthroline to the EtOH solution of bis(O‐ethylcarbonodithiolato) cobalt(II) [Co(Et‐XA)2]. The single crystal structure has been determined by X‐ray diffraction analysis. The compound is orthorhombic with space group Pna21 and unit‐cell parameters a = 1.0290(2) nm, b = 1.4550(3) nm and c = 1.4860(3) nm. The geometry of each Co atom which coordinates with four S atoms from two xanthate anions and two N atoms from phenanthroline ligand, is a distorted octahedron. The brown crystals were examined by elemental analysis, FT‐IR, UV spectra and thermogravimetric‐differential thermal analysis (TG‐DTA). Thermal decomposition of the compound takes place in several steps. In the first step, the compound releases 1, 10‐phenanthroline ligand, then loses the H2O molecules. In the second step, the complex decomposes to CoS3. The final product of thermal decomposition is CoS. Elemental analysis, IR and UV spectra are in agreement with the proposed structure.
Methanol electrooxidation on smooth platinum modified with Ru: The influence of Ru coverage and potentials on oxidative current and products
Authors: Wang Hong‐Sen
Published: September 2010

Methanol oxidation on smooth Pt electrode modified with different coverage of Ru was studied using cyclic voltammetry and potential step combined with differential electrochemical mass spectroscopy. The current efficiency of formed CO2 was calculated from faraday current and ion current of m/z = 44. The results show that Ru modified Pt electrode with the coverage of ca. 0.3 has the highest catalytic activity for methanol electrooxidation, i.e. faraday current and the current efficiency of CO2 at the low potentials reach to the maximum. In addition, Ru loses its co‐catalytic properties at the high potentials.
Influences of the hydrophobicity of the heme‐binding pocket on the properties and functions of cytochrome b5 mutants
Authors: Gan Jian‐Hua , Wang Yun‐Hua , Wu Jian , Huang Zhong‐Xian , Xia Zong‐Xiang
Published: September 2010

The mutation sites of the four mutants F35Y, P40V, V45E and V45Y of cytochrome b5 are located at the edge of the hemebinding pocket. The solvent accessible areas of the “pocket interior” of the four mutants and the wild‐type cytochrome b5 have been calculated based on their crystal structures at high resolution. The change in the hydrophobicity of the heme‐binding pocket resulting from the mutation can be quantitatively described using the difference of the solvent accessible area of the “pocket interior” of each mutant from that of the wild‐type cytochrome b5. The influences of the hydrophobicity of the heme‐binding pocket on the protein stability and redox potential are discussed.
Sterols from the fungus Catathelasma imperiale
Authors: Yang Sheng‐Ping , Xu Jun , Yue Jian‐Min
Published: September 2010

Eight ergostane‐type sterols and three their derivatives (one mono‐linoleate and two mono‐glucosides) were isolated from the ethyl acetate soluble fraction of the fungus Catathelasma imperiale. Two of them are novel compounds, namely 22E, 24R‐ergosta‐7,22‐diene‐3β,5α‐diol‐6β‐inoleate (1) and 22E,24R‐ergosta‐7,22‐diene‐3β,5β,6α‐triol (5) with an uncommon cis‐fused A/B ring. Structures of these compounds were demonstrated on the basis of their chemical evidences and spectroscopic methods, especially 2D NMR techniques.
Novel photo‐induced coupling reactions of 9‐fluorenylidene‐malononitrile or 1,1‐diphenyl‐2,2‐dicyanoethylene with 10‐methyl‐9,10‐dihydroacridine. A study on the photophysics of the reaction
Authors: Jiang Hong , Liu Yon‐Cheng , Wang Guan‐Wu , Wu Li‐Zhu , Tung Chen‐Ho
Published: September 2010

9‐Fluorenylidenemalononitrile (FDCN) or 1, 1‐diphenyl‐2,2‐dicyanoethylene (DPCN) reacted with 10‐methyl‐9,10‐dihydroacridine (AcrH2) under irradiation (λ 320 nm) to give couping products. In order to gain further insight into the mechanism of the photo‐induced reaction, the photophysics of the reactions of FDCN or DPCN with AcrH2 have been investigated by using UV‐vis spectroscopy, fluorescence spectroscopy, excitation spectroscopy and time‐resolved fluorescence spectroscopy, respectively. The results show that FDCN or DPCN interacts with AcrH2 in the ground states to form a charge transfer complex, which further reacts to give the coupling product upon. irradiation.
Investigation of Chemiluminescence with Electrogenerated Reagents and Its Analytical Application
Authors: Zhang Zhu‐Jup , Li Bao‐Xin , Zheng Xing‐Wang
Published: September 2010

In this paper, studies on chemiluminescence (CL) systems with electrogenerated reagents, including BrO−, CIO−, Br2, [Cu‐(HIO6)2]5‐, H2O2, Mn3+, Co3+ and Ag2+, are described. The analytical applications of the CL system with electrogenerated reagents are reviewed.
A Quick Estimate of the Correlation Energy for Alkanes
Authors: Li Shu‐Hua , Li Wei , Ma Jing
Published: September 2010

Within the localized molecular orbital description, the intra‐and interorbital pair correlation energies calculated with the coupled cluster doubles (CCD) theory have been obtained for methane, ethane, propane, butane, isobutane, pentane, isopentane and neopentane using the 6–31G* basis set. The results showed the quantitative transferability of pair correlation energies and gross orbital correlation energies within this series of molecules. Based on the gross orbital correlation energies of five sample alkanes (butane, isobutane, pentane, isopentane and neopentane), we have derived a simple linear relationship to estimate the CCD correlation energy for an arbitrary large alkane. The correlation energy predicted by this simple relationship remarkably recovers more than 98.9% of the exact CCD correlation energy for a number of alkanes containing six to eight carbon atoms. The relative stability of less branched isomers can be correctly predicted.
NaA Zeolite Membrane with High Performance Synthesized by Vapor Phase Transformation Method
Authors: Cheng Zhi‐Lin , Chao Zi‐Sheng , Lin Hai‐Qiang , Wan Hui‐Lin
Published: September 2010

NaA zeolite membrane was synthesized with high permeance on porous alumina substrate by the vapor phase transformation method. The membranes were characterized by XRD and SEM techniques. The XRD results showed that the membranes after the synthesis time of 24 h consisted of the pure NaA zeolite crystals. The SEM results showed that the membranes after the synthesis time of 48 h consisted of intergrown zeolite crystals. The H2 permeance of the NaA zeolite membranes was higher than 2.0 × 10−6 mol/(Pa · m2 · s), and the maximum of the gas H2/C3H8 permselectivity was 7.15, which is higher than the corresponding Knudsen diffusion selectivity of which is 4.69.
Theoretical Study on Intermolecular Interactions and Thermodynamic Properties of Difluoroamine Complex
Authors: Ju Xue‐Hai , Xiao He‐Ming , Xia Qi‐Ying
Published: September 2010

Ab initio calculations were carried out for difluoroamine complexes at the HF and MP2 levels with different basis sets. The BSSE correction was included with counterpoise procedure. The dimer, trimer and tetramer were all found to exhibit two minima. The corrected binding energies are ‐8.87, ‐19.19 and ‐33.81 kJ · mol−1 at the MP2/6–311G* *//HF/6–311G* * level for the more stable dimer, trimer and tetramer, respectively. At the G2 level, the binding energy for the cyclic dimer is ‐10.86 kJ · mol−1. There are two types of complexes: cyclic and chain. The contribution of cooperative effect to the interaction energy is up to 12.9% of the binding energy in the cyclic complexes, but negligible in the chain ones. There exist weak hydrogen bonds which involve six and eight F H contacts at ca. 0.23–0.24 nm in the cyclic trimer and cyclic tetramer, respectively. The intermolecular interaction is an exothermic process under 400.0K accompanied by a decrease in the probability.
Dinuclear Pentacarbonyl Tungsten Complex Bridged by Bis (3,5‐dimethylpyrazol‐1‐yl) methane
Authors: Zhao Xue‐Mei , Tang Liang‐Fu , Yang Pan , Wang Ji‐Tao
Published: September 2010

A new bis (pyrazol‐1‐yl) methane ligand, [Ph2 (HO) CCH (3,5‐Me2Pz)2, Pz= pyrazole] (1), with a bulky substituent on the methine carbon atom has been successfully synthesized by the reaction of bis(3,5‐dimethylpyrazol‐1‐yl) methyllithium with benzophenone. Treatment of this ligand with W(CO)6 under UV‐irradiation in THF at room temperature afforded a novel dinuclear complex CH2[3,5‐Me2PzW(CO)5]2 (2) with loss of the Ph2CO fragment, which was characterized by IR, 1H NMR spectra and elemental analyses as well as the X‐ray single crystal diffraction analysis. This compound crystallizes in the or‐thorhombic space group Pbcn, with a = 1.7690(3) nm, b = 1.4460 (3) nm, c = 1.2994 (2) nm, Z = 4, V = 3.3239 (10) nm3, Dc = 1.775 g · m−3, μ = 6.967 mm−1, F (000) = 1672, R1 = 0.0414 and wR2 = 0.0988. Bis(3,5‐dimethylpyrazol‐l‐yl) methane acts as a bridging bidentate ligand in this complex, which links two W(CO)5 fragments. In addition, heating this complex under reflux in 1,2‐dimethoxyethane (DME) gives the known chelated mononuclear complex CH2(3,5‐Me2Pz)2‐W(CO)4 (3).
Palladium‐Catalyzed Addition of Carbon Monoxide and Carbon Tetrachloride to 1‐Octene in Supercritical Carbon Dioxide
Authors: Zhang Qun‐Jian , Sun Jun‐Hua , Jiang Huan‐Feng , Ouyang Xiao‐Yue , Cheng Jin‐Sheng
Published: September 2010

The Pd‐catalyzed addition of carbon monoxide and carbon tetrachloride to 1‐octene gave coadduct [alkyl 2‐(2, 2, 2‐trichloroethyl)octanoate] as the major product in supercritical carbon dioxide by using pyridine as the base. It was found that the selectivity and the yield of coadduct were greatly affected by the pressure of carbon dioxide, the reaction temperature and the amounts of alcohol and base used.
Synthesis of Novel Anionic Receptors with (Thio) urea and Amide Binding Sites and the Recognition Properties for Anions
Authors: Wu Jin‐Long , Wei Lan‐Hna , Zeng Zhen‐Ya , Liu Shun‐Ying , Gong Rui , Meng Ling‐Zhi , He Yong‐Bing
Published: September 2010

Two new neutral receptors (1 and 2) containing (thio) urea and amide groups were synthesized by simple steps in good yields. The binding properties for anions of 1 and 2 were characterized by UV‐vis and fluorescence spectra. Receptor 1 had an excellent selectivity for AcO− in comparison with other anions. The association constants of 1 · AcO− and 2 · p‐NO2PhOPO23− were higher than those of other anions (Cl−, Br−, I−, H2PO−4 and p‐NO2PhO−). In particular, an obvious color change was observed from light yellow to golden yellow upon addition of AcO− to the solution of 1 in DMSO. The results of non‐linear curve fitting by UV‐vis and fluorescence spectral data indicate that a 1:1 stoichiometry complex is formed between compound 1 or 2 and anions through a hydrogen bonding interaction.
Prediction on Critical Micelle Concentration of Nonionic Surfactants in Aqueous Solution: Quantitative Structure‐Property Relationship Approach
Authors: Wang Zheng‐Wu , Huang Dong‐Yang , Gong Su‐Ping , Li Gan‐Zuo
Published: September 2010

In order to predict the critical micelle concentration (cmc) of nonionic surfactants in aqueous solution, a quantitative structure‐property relationship (QSPR) was found for 77 nonionic surfactants belonging to eight series. The best‐regressed model contained four quantum‐chemical descriptors, the heat of formation (ΔH), the molecular dipole moment (D), the energy of the lowest unoccupied molecular orbital (ELUMO) and the energy of the highest occupied molecular orbital (EHOMO) of the surfactant molecule; two constitutional descriptors, the molecular weight of surfactant (M) and the number of oxygen and nitrogen atoms (nON) of the hydrophilic fragment of surfactant molecule; and one topological descriptor, the Kier & Hall index of zero order (KH0) of the hydrophobic fragment of the surfactant. The established general QSPR between Ig(cmc) and the descriptors produced a relevant coefficient of multiple determination: R2 = 0.986. When cross terms were considered, the corresponding best model contained five descriptors ELUMO. D, KH0, M and a cross term nON · KH0, which also produced the same coefficient as the seven‐parameter model.
Synthesis, Structure and Optical Limiting (OL) Properties of a Novel Incomplete Cubane‐like Cluster [PPh4] [(η5‐C5Me5) WS3‐(CuBr) (Cul)2 (μ‐dppm)]
Authors: Yu Hong , Xu Qing‐Feng , Ji Shun‐Jun , Lang Jian‐Ping , Sun Zhen‐Rong
Published: September 2010

Reaction of [PPh4][η5‐C5Me5)WS3] with Cul, CuBr and bis‐(diphenylphosphino)methane (dppm) (molar ratio = 1:2:1:1) in MeCN gave rise to [PPh4][(η5‐C5Me5)WS3 (CuBr)(Cul)2‐(μ‐dppm)] (1) in high yield. Compound 1 crystallizes in the monoclinic, space group P21/n with lattice parameters: a = 1.2906(4) nm, b = 1.5006(8) nm, c = 3.1484(6) nm, β = 92.12(2)°, V = 6.093(3) nm3, Z = 4. The structure of the anion of 1 contains an incomplete WS3Cu3 cubane‐like core in which two Cul units are bridged by a dppm ligand. The W‐Cu distances vary in the range of 0.2644(1)–0.2793(1) nm. The optical limiting (OL) properties of 1 in MeCN were measured with the laser pulse‐width of 12‐ns at 532 nm, and the nanosecond OL effect may be due to the reverse saturable absorption (RSA) related to the excited triplet states.
A New Triterpenoid Saponin and a New Glycoside from Epigynum aurilum
Authors: Cao Jian‐Xin , Lai Guo‐Fang , Wang Yi‐Fen , Yang Liu‐Bing , Luo Shi‐De
Published: September 2010

A new triterpenoid saponin with novel sugar moiety (1), a new trisaccharide derivative (2), as well as a known monosaccharide derivative (3), were isolated from the dried stem of Epigynum aurilum. The structures of compounds 1 and 2 were determined by MS and NMR spectram analyses.
A Novel Proton Sensor with Luminescence and Color Signaling Based on Platinum(II) Terpyridyl Acetylide Complex
Authors: Yang Qing‐Zheng , Wu Li‐Zhu , Wu Zi‐Xin , Zhang Li‐Ping , Tung Chen‐Ho
Published: September 2010

A novel sensitive probe for proton based on platinum(II) terpyridyl acetylide complex by monitoring the changes both in luminescence and color is described.
Synthesis and Crystal Structure of a Puckered Rhombus Grid‐like Coordination Polymer with Bridging Ligand Containing Sulfanyl Linker
Authors: Han Lei , Luo Jun‐Hua , Hong Mao‐Chun , Wang Rui‐Hu , Lin Zheng‐Zhong , Cao Rong
Published: September 2010

A new coordination polymer with sulfide moieties, [Co(ptmb)2] · 0.25H2O (ptmb=4–(4‐pyridylthiomethyl)‐benzoate), was synthesized by self‐assembly of Co(NO3)2 · 6H2O with Hptmb under solvothermal conditions. X‐ray single crystal diffraction study shows that it is a 2D layer structure consisting of puckered rhombus grid with dimensions 1.175 nm ×1.110 nm.
Hydrothermal Synthesis and Properties of Open‐Framework Mixed‐valence Iron Phosphates Fe2lll Fell1.5(PO4)3 with Three‐dimensional Structure
Authors: Duan Li‐Ying , Liu Fu‐Chen , Wang En‐Bo , Li Yang‐Guang , Hu Chang‐Wen , Xu Lin
Published: September 2010

The open‐framework iron phosphate Fe2lllFe1.5ll,(PO4)3 was hydrothermally synthesized and characterized by elemental analysis, IR, EPR, XPS and single crystal X‐ray diffraction analysis. The title compound crystallized in the triclinic, space group P1 with a=0.64724(4) nm, b=0.79651(6) nm, c=0.94229(5) nm, a= 104.447(2)°. β= 108.919(4)°. y= 101.741(4)°, V=0.42302(5) nm3, Z= 1 and RI (wR2)=0.0307 (0.0793). Crystal data were collected on a Rigaku R‐AXIS RAPID IP diffractometer with Mo Ka (γ=0.071073 nm) at 293(2) K in the range of 2.43°<Õ <27.46°. The structure of 1 consists of 19 non‐hydrogen atoms including three and a half crystallographically independent Fe and three P atoms. Fe(1) connects its symmetrical Fe(1A) through bridging oxygen forming a dimer and the dimers are connected by Fe(4) forming an infinite staircase‐like chain. Fe(2) and Fe(3) connect the infinite chains into a layer with bridging oxygen. Layers are interconnected via Fe(4) forming the six‐membered and eight‐membered channel systems.
Synthesis and Crystal Structure of a Two‐dimensional Silver(I)‐Iron(III) Heteronuclear Coordination Polymer: {[Ag,Fe2(SCN)12(H2O)2] [(inaH)2(H2O)2]}n
Authors: Li Xiu‐Ling , Tong Ming‐Liang , Niu De‐Zhong , Chen Jiu‐Tong
Published: September 2010

The 2‐D heteronuclear coordination polymer {[Ag4Fe2(SCN)12(H2O)2] (inaH)2(H2O)2}n(1) (inaH is the abbreviation of protonated isonicotinic acid) with chemical formula C24Ag4Fe2N14O8S12has been synthesized and characterized by single crystal X‐ray diffraction, elemental analysis and IR spectroscopy. The Ag2S2rings connect two kinds of octahedral geometries of Fe(III) ions, [Fe(NCS)6]3–and Fe(H2O)2(NCS)4]−units with bridging thiocyanate ions leading to 2‐D [Ag4Fe2(SCN)12(H2O)22–anion framework. Four kinds of rings including the unprecedented thirty‐two membered Ag4Fe4(SCN)8rings share comers or edges in the 2‐D anion layer structure. All thiocyanates coordinate to the metal ions according to the HSAB principle with N atoms binding to the Fe(III) ions and with S atoms binding to Ag(I) ions. Pronoated ina cations stabilize the layer structure as counter ions and hydrogen bonds were formed within the pronoated in a cations dimer and between the dimers and the lattice waters. Crystal data:Mr=1560.44, triclinic,P1,a=0.76082(1) nm, b=0.9234 nm, c= 1.85611(4) nm,a=103.0170(10)°, β=93.7780(10)°,y=97.4080(10)°,V= 1.25385(3) nm3, Z=1, μ(Mo Kα)=2.650 mm−1,Dc,=2.067 g · cm−3,F(000)=758,R1=0.0412. wR2=0.1003.
Analysis of the Nucleoside Content of Cordyceps sinensis Using the Stepwise Gradient Elution Technique of Thin‐layer Chromatography
Authors: Ma King‐Wah , Chau Foo‐Tim , Wu Jian‐Yong
Published: September 2010

Nucleoside is the main class of active components in Cordyceps sinensis. Thin‐layer chromatography (TLC) is one of the most commonly used methods in pharmacopoeias for analyzing chemical components of herbal medicine. Since the isocratic elution method cannot be applied successfully in TLC analysis for separating all the nucleoside components, the stepwise gradient elution has been developed in this work to separate eight nucleoside standards with success. In this way, quantitative analyses of the samples of Cordyceps sinensis were achieved via the proposed TLC procedure coupled with the scanning densitometric techniques of CAMAG and TLCQA methods for qualitative and quantitative analysis.
Synthesis and Crystal Structure of Di‐n‐butyltin(IV) Complex with 2‐Oxo‐propionic Acid (4‐Pyridinecarbonyl) Hydrazone
Authors: Liu Hong‐Wen , Lu Wen‐Guan , Tao Jia‐Xun
Published: September 2010

The novel complex di‐n‐butyltin(IV) 2‐oxo‐propionic acid (4‐pyridinecarbonyl) hydrazone, (n‐C4H9)2Sn‐[O2CC(CH3)=N‐N=C(‐O)C5N‐4] (H2O) has been synthesized and its structure has been determined by X‐ray diffraction analysis. The complex crystallizes in orthorhombic system with space groupPca21. Crystal data:a=2.7540(9) nm,b=0.9676(3) nm,c=1.5750(5) nm, V=4.197(2) nm3,Dc=1.444 g/cm3, Z=8. μ= 1.241 mm−1.F(000)= 1856,R1=0.0462 andwR2=0.1001. In the crystals of the title complex, the tin atom is in six‐coordination with a distorted octahedral geometry, three oxygen atoms [O(1), O(3) and O(4)] and one nitrogen atom N(1) forming the equatorial plane and C(10)‐Sn(1)‐C(14) being the axis. Two molecules form a dimer with weak interactions of Sn‐O bonding and hydrogen bonds.
An Alternative Method for Anomeric Deacetylation of Per‐acetylated Carbohydrates
Authors: Li Ying‐Xiae , Li Yu‐Wen , Zhaivg Wei , Guan Hua‐Shi
Published: September 2010

An alternative method for anomeric deacetylation of fully acetylated carbohydrates has been developed using imidazole in methanol.
Crystal Structure and Thermal Decomposition Mechanism of [K(DNP)(H2O)0.5]
Authors: Ma Gui‐Xia , Zhang Tong‐Lai , Zhang Jian‐Guo , Shao Bing , Li Yu‐Feng , Song Jiang‐Chuang , Yu Kai‐Bei
Published: September 2010

The new coordination polymer, [K(DNP)(H2O)0.5]n(DNP=2, 4‐dinitrophenol) was prepared by the reaction of 2,4‐dinitrophenol with potassium hydroxide. The molecular structure was determined by X‐ray single‐crystal diffraction analysis, FT‐IR techniques, and elemental analysis. The crystal is monoclinic, space group C(2)/c with the empirical formula of C6N2O5.5K, Mr=231.21. The unit cell parameters are as follows: a=2.0789(3) nm, b= 1.2311(2) nm. c=0.7203(1) nm. β=109.611(15)°, V=1.7366(4) nm3, Z=4. 0, = 1.769 g/cm3, F(000)=936, μ (Mo Kα) =0.617 mm−1. The potassium ions coordinate with all the oxygen atoms of phenolic hydroxyl group and nitro‐group of different 2,4‐dinitrophenol (DNP) ligands with high coordination number, and form a god cross‐linked three‐dimensional net structure of which makes the complex with god stabilities. The thermal decomposition of [K(DNP)(H2O)0.5]n has only an intense exothermic process in the temperature range of 338–343 °C corresponding to a mass loss of 75.029s. The final decomposition residue is potassium isocyanide.
Synthesis, Crystal Structure and Magnetic Property of Sanwich‐Type Heteropolyoxometalate Na9[(Na(H2O),}3{Cu(H20)}3(BiW9O33)2] 42H2O
Authors: Xue Gang‐Lin , Wang Hu‐Lin , Xie Zhi‐Hai , Shi Qi‐Zhen , Wang Ji‐Wu , Wang Da‐Qi
Published: September 2010

The heteropolytungstate Na9[{Na(H2O)2}3{Cu(H2O)}3(BiW9O33) 42H2O is obtained by the reaction of Na2WO4·2H2O, Bi(NO3)3 · 5H2O with CuCl2 · 2H2O at pH≠6. The structure and chemical composition are determined by X‐ray diffraction analysis and elemental analysis. The crystal data and main structure refinement are: a = 1.410(3) nm, b=2.338(5) nm, c=3.173(6) nm, β=98.06(4)°. V= 10.354(35) nm3. monoclinic crystal system, space group: C2/c, Z = 4, R1= 0.0471. wR2 = 0.0642 I>2σ(I)]. R1= 0.1371, wR2 = 0.0868 (all data). [(Na(H2O)2}3{Cu(H2O)}3W9O33)2]9– has D34 symmetry. IR, UV‐vis spectra, TG curve and magnetic property of the complex were also discussed. The compound exhibits an antiferromagnetic coupling with J= ‐8.08 cm−1 and g =2.21.
Study on Syntheses and Anti‐bacterial Activities of Some New Transition Metal Complexes with Schiff Base Ligand Containing Pyridine and Amide Moieties
Authors: Li Mei‐Ying , Hu Pei‐Zhi , Zhu Jun‐Cheng , Liu Yi , Xu Kuo‐Xi
Published: September 2010

Several new transition metal complexes using Schiff base containing pyridine and amide moieties (N, N′ ‐bis(ß‐salicylaliminoethyl)‐2, 6‐pyridinedicarboxylic amide, H1L) as the ligand have been prepared. Their compositions and structures are corroborated by elemental analysis. IR, W, 1H NMR, DTA‐TG and molar conductivity data. Their anti‐bacterial activities have been studied by microcalorimetry. The result shows that the ligand and all complexes are potential anti‐bacteria reagent and their inhibitory capacities are concentration‐depended. The Mn complex has the strongest inhibitory capacity.
Direct Electrochemical Oxidation of NADPH at a Low Potential on the Carbon Nanotube Modified Glassy Carbon Electrode
Authors: Chen Jing , Cai Chen‐Xin
Published: September 2010

NADPH can be directly oxidized on a carbon nanotube modified glassy carbon (CNT/GC) electrode in phosphate buffer solution (pH=6.0) with a diminution of the overpotential of more than 700 mV. The anodic peak currents increase linearly with the increase of concentration of NADPH in the range of 5×10−‐1 to 1×10−‐1 mom with a detection limit of about 1×10−‐1 mol/L. The CNT/GC electrode exhibits high sensitivity, low potential and stability in detecting NADPH and thus might be used in biosensors to study the electrocatalytic reaction of important de‐hydrogenase‐based biological systems.