摘要：
A new macrocyclic dinuclear Zn(II) complex is synthesized by the cyclocondensation between 3,3 '(ethane-1,2-diylbis (benzylazanediyl))bis(methylene) bis (2-hydroxy-5-methyl-benzaldehyde) and 1,3-diaminopropane and the subsequent with zinc salts. The as-prepared complex is characterized by elemental analysis, FT-IR, ES-MS and single crystal X-ray diffraction. The complex consists of one independent molecular unit of [Zn-2(mu-OAC)L](+) ClO4- and two water molecules with one on a symmetry element. Four of these units collectively form two pairs of dinuclear complex units of [Zn-2(mu-OAc)L](+) with one unit sharing two perchlorate ions and one water molecule and the other unit sharing two perchlorate ions and one symmetry equivalent water molecule. Each zinc(II) ion exhibits a slightly distorted square pyramidal geometry. Two Zn atoms are bridged by two oxygen atoms of an acetate anion and two phenolic O atoms. The Zn-Zn distance is 2.951 angstrom. An ordered two-dimensional network is formed by weak intermolecular interactions in the crystal structure of the complex. The phosphate ester hydrolysis activity and the antibacterial activity of the complex are studied. The results showed that the synthesized complex has an ef ficient catalytic activity of phosphoester bond cleavage and the potential to inhibit the growth of E. coli . The optimum catalytic rate constant (k(cat)) at pH 7.8 for the hydrolysis of 4nitrophenyl phosphate disodium salt hexahydrate (pNPP) by the synthesized complex is 2.98 x 10(-4) s(-1) , and 10(5) times faster than that the spontaneous hydrolysis of the phosphate monoester. Published by Elsevier B.V.
摘要：
<jats:title>Abstract</jats:title><jats:p>Dinuclear Ni(II) macrocyclic complex <jats:bold>A</jats:bold> ([Ni<jats:sub>2</jats:sub>L<jats:sup>1</jats:sup>OAc]ClO<jats:sub>4</jats:sub>⋅CH<jats:sub>3</jats:sub>OH⋅H<jats:sub>2</jats:sub>O) and dinuclear Ni(II) acyclic complex <jats:bold>B</jats:bold> ([Ni<jats:sub>2</jats:sub>L<jats:sup>2</jats:sup>](ClO<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>) were synthesized by condensation between H<jats:sub>2</jats:sub>L (3,3′‐(ethane‐1,2‐diylbis(benzylazanediyl))bis(methylene)bis(2‐hydroxy‐5‐methyl‐benzaldehyde)) and different molar equivalent 1,3‐propanediamine in the presence of Ni(II) ions. The structures of complexes were characterized by IR spectroscopy, elemental analysis, electrospray mass spectra and X‐ray single crystal diffraction. In complex <jats:bold>A</jats:bold>, the Ni(II)‐Ni(II) distance was 2.9413(7) Å, bridged by two phenolic oxygens and an acetate anion, while in complex <jats:bold>B</jats:bold>, it was 3.0540(1) Å, only bridged by two phenolic oxygens. The calf thymus DNA (CT‐DNA) binding ability was studied through spectroscopic and electrochemical methods, the corresponding binding constant for complexes <jats:bold>A</jats:bold> and <jats:bold>B</jats:bold> were 6.45×10<jats:sup>4</jats:sup> M<jats:sup>−1</jats:sup> and 8.65×10<jats:sup>4</jats:sup> M<jats:sup>−1</jats:sup>, respectively. The MS revealed that <jats:bold>B</jats:bold> can transform to <jats:bold>A</jats:bold> by adding more H<jats:sub>2</jats:sub>L, and <jats:bold>A</jats:bold> cannot transform to <jats:bold>B</jats:bold> in the presence of excess 1,3‐propanediamine.</jats:p>
摘要：
<jats:title>Abstract</jats:title><jats:p>Baicalin is one of the major bioactive constituents of <jats:italic>Scutellaria baicalensis Georgi</jats:italic>, possessed anti‐inflammation, antimicrobial and anticancer activity, has been attained extensive attention. In the present work, a new baicalin‐Sr(II) complex (Sr[baic]⋅3H<jats:sub>2</jats:sub>O) was synthesized to enhance its biological activity. A series of experiments were carried out to give the satisfying reaction conditions: pH=8.3 and the molar ratio of L:M ≤ 1:1. The obtained complex Sr[baic]⋅3H<jats:sub>2</jats:sub>O was characterized by IR, ES‐MS UV‐vis, atomic absorption, elemental analysis and thermogravimetric analysis. The interactions between baicalin/Sr[baic] and bovine serum albumin were also researched through fluorescence spectrum, which accord with the static quenching mechanism, Sr[baic] has higher binding ability than baicalin. Thermodynamic parameters ΔG°<0, ΔH°<0 and ΔS°>0, indicated that electrostatic forces is the major interaction forces in Sr[baic]‐bovine serum albumin system. Furthermore, the synchronous fluorescence experiments were carried out. The studies revealed that both baicalin and Sr[baic] quench the intrinsic fluorescence of bovine serum albumin, and the possible binding site is located on Trp residues. In circular dichroism spectrum, the binding of baicalin and Sr[baic] to bovine serum albumin lead to a loss in helical stability, by contrast, Sr[baic] increases baicalin's binding ability.</jats:p>
作者：
Hongmei Chen;Liping Zhang;Xianzhong Cheng;Siqing Cheng;Dazhong Yan
期刊：
Asian Journal of Chemistry,2014年26(19):6579-6582 ISSN：0970-7077
通讯作者：
Chen, H.
作者机构：
[Cheng X.; Cheng S.; Chen H.; Zhang L.] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei Province 430023, China;[Yan D.] School of Biology and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan, Hubei Province 430023, China
通讯机构：
[Chen, H.] S;School of Chemical and Environmental Engineering, China
关键词：
Adsorption;Bamboo leaves biomass;Isotherm;Kinetics;Malachite green
摘要：
A novel method was investigated using chemically pretreated orange peel (POP) powder to separate and pre-concentrate Cr(III) in environmental water. In this study, the raw orange peel was pretreated with petroleum ether-NaOH and employed as selective sorbent for the separation of Cr(III) ions in the presence of Cr(VI). The influences of pH, sample flow rate, elution concentration and volume, and breakthrough volume were investigated in detail. Cr(III) was selectively adsorbed on the microcolumn packed with POP in the pH range from 3.5 to 5.5, while the unretained Cr(VT) was determined directly in the effluent. The retained Cr(III) was eluted with 2.0 mL of 1.2 mol L HNO3 followed by determination with ICP-MS. Under the optimum conditions, the detection limits based on 3σ criterion were 0.009 ng mL-1 and 0.037 ng mL-1 for Cr(III) and Cr(VI), respectively. The relative standard deviations (RSD) were less than 4.1% (n=11, c=2.0 ng mL-1). The proposed method was successfully applied to the speciation determination of Cr(III) and Cr(VI) in water samples. The recoveries in spiked environmental water samples ranged from 98.5% to 103.8%. A reference water sample GBW(E)080642 was also analyzed and the results were in good agreement with the certified values.
作者机构：
[Peng Y.; Cheng X.Z.; Chen H.M.] School of chemical and environmental engineering, Wuhan Polytechnic University, Wuhan 430023, China;State Key Laboratory of Geoprocesses and Mineral Resources, China University ofGeosciences, Wuhan430074, China;[Xiao H.Y.] School of chemical and environmental engineering, Wuhan Polytechnic University, Wuhan 430023, China, State Key Laboratory of Geoprocesses and Mineral Resources, China University ofGeosciences, Wuhan430074, China
通讯机构：
[Cheng, X. Z.] S;School of chemical and environmental engineering, , Wuhan 430023, China
会议名称：
2013 International Conference on Materials for Renewable Energy & Environment(MREE 2013)
摘要：
The use of low-cost and eco-friendly adsorbents has been investigated as an ideal alternative to the currentexpensive methods of removing arsenic from wastewater. Orange peel was collected from the lo
关键词：
Adsorption;Freshwater fish scale;Mercury;Removal;Wastewater
摘要：
<jats:p>The adsorption of freshwater fish scales were used to remove Hg<jats:sup>2+</jats:sup>in industrial wastewater. The effects of pH, shaking time, initial concentration on the adsorption Hg<jats:sup>2+</jats:sup>onto freshwater fish scale were investigated. In these conditions, by varying the pH of the mercury (II) solutions from 2 to 8, the removal efficiency remained higher than 96%. Optimal adsorption capacity was 117.2 mg g<jats:sup>-1</jats:sup>at pH 6.0. Characterization of the biosorbent fish scales was performed using scanning electron microscope (SEM), and Fourier transform-infrared (FTIR) spectroscopy. The mechanism for the adsorption was studied. The adsorption of Hg<jats:sup>2+</jats:sup>on to freshwater fish scale could be described by Langmuir isotherm model.</jats:p>
摘要：
A simple and rapid spectrophotometric method is described for the determination of trace zinc(II) in zinc-enriched yeast using 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) as a chromogenic reagent in the presence of surfactant OP. The analytical parameters such pH, reagent and coexistent ions were investigated. The results showed that the maximum absorption wavelength of the complex Zn-5-Br-PADAP was identified at 556 nm. The apparent molar absorptivity was 1.16 x 10(5) L mol(-1) cm(-1). Beer's law was obeyed in the concentration range of 0 similar to 12 mu g/25 mL for zinc. The interference of various ions was studied by sodium citrate and thiourea as masking agents. The proposed method has been applied to the determination of Zn in yeast-enriched samples with satisfactory and results agreed with those provided by atomic absorption spectrometry.
作者机构：
[Peng, Yuan; Cheng, Xianzhong; Chen, Hongmei; Liu, Jin] School of chemical and environmental engineering, Wuhan Polytechnic University, Wuhan, 430023, China
通讯机构：
[Cheng, X.] S;School of chemical and environmental engineering, , Wuhan, 430023, China
会议名称：
2012 International Conference on Environment Materials and Environment Management, EMEM 2012
