Antibacterial study of Eucalyptus grandis fabricated zinc oxide and magnesium doped zinc oxide nanoparticles and its characterization

Mg-doped zinc oxide and zinc oxide nanoparticles were prepared by using methanolic seed extract from the Eucalyptus grandis plant via a green approach. Phytoconstituents present in seed extract act as capping and stabilizing agents for the biosynthesis of nanoparticles. Doping of Mg to zinc oxide nanoparticles increases the bandgap energy, thus enhancing its chemical, physical and optical properties. Further, it was characterized by various techniques such as scanning electron microscopy giving morphological information about the wurtzite hexagonal structure of bio-synthesized nanoparticles. X-ray diffraction technique tells about the crystalline nature of particles and the average crystallite size for zinc oxide and doped zinc oxide nanoparticles. Mg as a dopant enhances the properties of nanoparticles, thus making it more efficiently applicable as an antibacterial agent against Escherichia coli, gram-negative bacteria.     

Synthesis and characterization of ZnO nanoparticles by thermal decomposition of a curcumin zinc complex

ZnO nanoparticles were generated by thermal decomposition of a binuclear zinc (II) curcumin complex as single source precursor. Thermal behavior of the precursor showed a considerable weight loss at about 374 °C by an exothermic reaction with a maximum weight loss rate of 14%/min. Complete decomposition of precursor was observed within 49 min with a heating rate of 10 °C/min. Synthesized nanoparticles have been characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy and selected area electron diffraction microscopy. Results revealed monodispersed hexagonal zincite structure with an average size of 117 ± 4 nm.     

Photochemical reaction of W(CO)6 with SnCl4 II. Synthesis and X-ray structure of tetrachlorobis(triphenylphosphine oxide)tungsten(IV), [WCl4(OPPh3)2]

The crystal structure of [WCl₄(OPPh₃)₂](1), formed in the photochemical reaction of W(CO)₆ with SnCl₄ in the presence of triphenylphosphine, has been determined by the single-crystal X-ray diffraction method. The compound crystallizes in the monoclinic space C2/c, with A=14.027(3), B=13.163(3), C=19.621(4) Å, β=96.36(3)°, Z=4. The structure solved by heavy-atom methods has been refined to R=0.0466, for 3489 observed reflections.

The [WCl₄(OPPh₃)₂] molecule possesses a crystallographically imposed C₂ axis passing through the tungsten atom. Despite steric demands, a mutually cis arrangement of triphenylphosphine oxide oxygens is found for [WCl₄(OPPh₃)₂], while there is a slight lengthening of the W---Cl bonds trans to the oxygen atoms.     

Research of protein adsorption on the different surface topography of the zinc oxide

The effect of the surface topography on the protein adsorption process is of great significance for designing biomaterial surfaces and the biocompatibility for specific biomedical applications. In this work, we have systematically investigated the mono‐protein adsorption kinetics of bovine serum albumin (BSA) and fibrinogen (Fg) adsorbed on the four different surface topographies (nanoparticles (NPs), nanorods (NRs), nanosheets (NSs) and nanobeams (NBs) of Zinc oxide (ZnO), respectively. The competition of multi‐protein adsorbed on them has been studied as well. Results showed that each protein had a singular process of adsorption that fitted well by Spreading Particle Model (SPM). It confirmed that ZnO NRs compared with other samples had more adsorption sites, which could provide more opportunities for the interaction between material and protein molecules. In addition, the Fg compared to the BSA could be more tightly adsorbed to the surface, both of which existed slight conformational changes by Fourier transform infrared (FTIR) and circular dichroism spectra (CD). Taken together, all these consequences well demonstrated that NRs may have wider applications in designing biomaterial surfaces and the biocompatibility for implanted biomaterials. Copyright © 2014 John Wiley & Sons, Ltd.     

The crystal structure of (dimorpholinophosphoryl)carbonitrile oxide

An X-ray diffraction study of (dimorpholinophosphoryl)carbonitrile oxide (1) was carried out. The structure of the nitrile oxide group in compound1 is more similar to that in fulminic acid (HCNO) than to those in aryl- and hetarylcarbonitrile oxides. The NO bond in1 is shorter than those in the latter compounds, and the nitrile oxide fragment is more linear due to an increase in the XCN angle.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1245–1247, July, 1994.This work has been financially supported by the Russian Foundation for Basic Research, project No. 93-03-5069.     

Synthesis and structure of quasi-one-dimensional zinc oxide doped with manganese

Nanotubes of manganese-doped zinc oxide Zn_{1 − x} Mn _x O (0 ≤ x ≤ 0.2) were synthesized by heating the Zn_{1 − x} Mn _x (HCOO)(OCH₂CH₂O)_1/2 precursor in air at 500°C. The precursor with extended crystals was synthesized by a solvothermal method based on heat treatment of a mixture of Zn_{1 − x} Mn _x (HCOO)₂ · 2H₂O with an ethylene glycol excess at 100–130°C. The tubular morphology of Zn_{1 − x} Mn _x O particles was identified by transmission electron microscopy. Tubular quasi-one-dimensional particles were shown to have a nanodispersed polycrystalline structure, the size of separate crystallites being from 5 to 20 nm. X-ray photoelectron spectroscopy suggested that the manganese distribution on the outer surface layer of Zn_{1 − x} Mn _x O nanotubes is nonuniform.     

Synthesis and Crystal Structure of NaeTiO3

The crystal structure of a sodium titanium oxide Na2TiO3 obtained by high temperature solid state reaction method was determined from single-crystal X-ray diffraction study. The compound crystallizes in the monoclinic system, space group C2/c, Mr = 141.88, a = 9.885（1）, b = 6.4133（8）, c = 5.5048（7） A, β = 115.50（3）°, V = 314.99（7） A^3, Z = 4, Dc = 2.992 g/cm^3, 2 = 0.71073A,μ = 27.80 cm^-1, F（000） = 272, T= 295 K, R = 0.0189 and wR = 0.0512 for 30 variables and 370 contributing unique reflections. The three-dimensional structure in Na2TiO3 is constructed by the TiO（1）4O（2） and NAO（1）3O（2）2 groups. The titanium atoms are grouped in the form of trigonal bipyramid and arranged along the c axis by sharing the edges. The structure is compared with other structures of related A2BO3 compounds.     

Synthesis of bimetallic complexes based on acetylacetonates of aluminum and ferrum. Crystalline structure Al0.9Fe0.1(acac)3

X-Ray diffraction analysis of cocrystallization of Al(acac)₃ and Fe(acac)₃ in a broad range of compositions has been performed. It has been established that in the ratio Al:Fe ～0.9:0.1 bi metallic phases are formed, isostructural to γ-Al(acac)₃. The crystalline structure of Al_0.9Fe_0.1(acac)₃ has been determined (autodiffractometer X8 APEX Bruker, MoK _α-radiation), crystallographic data: a = 15.709(1) Å, b = 32.637(3) Å, c = 13.388(1) Å, V = 6863.9(9) ų, space group Pna2₁, Z = 16, d _calc = 1.264 g/cm³. The parameters of the elementary cell Al_0.5Fe_0.5(acac)₃ have been refined (diffractometer DRON-RM4, CuK _α-radiation, Ni-filter). It is shown that the values V/Z are regularly increasing with increased content of Fe. The product of thermolysis Al_0.5Fe_0.5(acac)₃ is monophase and isostructural to γ-Fe₂O₃.     

Synthesis and Crystal Structure of Na2TiO3

The crystal structure of a sodium titanium oxide Na2TiO3 obtained by high temperature solid state reaction method was determined from single-crystal X-ray diffraction study. The compound crystallizes in the monoclinic system, space group C2/c, Mr = 141.88, a = 9.885(1), b = 6.4133(8), c = 5.5048(7) , β = 115.50(3)o, V = 314.99(7) 3, Z = 4, Dc = 2.992 g/cm3, λ = 0.71073 , μ = 27.80 cm–1, F(000) = 272, T = 295 K, R = 0.0189 and wR = 0.0512 for 30 variables and 370 contributing unique reflections. The three-dimensional structure in Na2TiO3 is constructed by the TiO(1)4O(2) and NaO(1)3O(2)2 groups. The titanium atoms are grouped in the form of trigonal bipyramid and arranged along the c axis by sharing the edges. The structure is compared with other structures of related A2BO3 compounds.     

室温下纳米氧化锌新相的合成及表征

常温常压下,用高分子聚乙烯吡咯烷酮(PVP)作为表面修饰剂,成功地合成了粒度分布窄、平均粒度为4.0nm的氧化锌纳米微粒,其晶体结构与文献报道在高温高压(450℃,6×10⁸Pa)下合成的体相ZnO具有相同结构.EXAFS实验结果表明,纳米Zn-O的键长比体相发生收缩,Zn原子周围的氧配位数减少.     

Crystal structure and thermal analysis of diaquadi (1,2,4-triazol-5-one)zinc(II) ion nitrate

A new complex, diaquadi(1,2,4-triazol-5-one)zinc(II) ion nitrate formulated as {[Zn(TO)₂(H₂O)₂](NO₃)₂}_n (1) (1,2,4-triazole-5-one, abbreviated as: TO) was synthesized and characterized by elemental analysis, X-ray single crystal diffraction, infrared spectrum (IR), differential scanning calorimetry (DSC), thermogravimetric analysis and differential thermogravimetric analysis (TG-DTG). The X-ray structure analysis reveals that the complex is orthorhombic with space group Pbca and unit-cell parameters a=6.9504(2) Å; b=10.6473(3) Å; c=17.8555(5) Å. Based on the result of thermal analysis, the thermal decomposition process of the compound was derived. From measurement of the enthalpy of solution in water in 298.15 K, the standard molar enthalpy of solution of lignand TO and the complex were determined as 15.43±0.18 and 52.64±0.42 kJ mol^?1, respectively. In addition, the standard molar enthalpy of formation of TO(aq) was calculated as ?126.97±0.72 kJ mol^?1.     

Electrochemically induced growth of zinc oxide.

The electrolytically induced precipitation of zinc oxide from zinc nitrate solution on gold surfaces in the presence of water-soluble polymers was examined for reaction times between 0.5 and 600 seconds. Regardless of the additive, polycrystalline films of zinc oxide have formed after 30 seconds, but polymeric additives dramatically change the morphology of the ZnO films. Amperometric analysis and fitting the diffusion reduced the current density-time curve according to Avrami kinetics and it reveals that polymers bearing methacrylic acid groups result in spherical growth whereas such with sulfonic acid groups lead to a platelike growth of crystallites. Without additive prisms grow predominantly in one dimension. These findings are confirmed also by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis.     

以氧化锌为锌源的手性金属-有机骨架的合成及其用于联糠醛外消旋体的选择性吸附

通过使用氧化锌代替传统的金属无机盐为锌源,制备了手性金属-有机骨架(CMOF)[Zn(L-mal)(H₂O)₂]_n并对其手性分离性能进行了考察。将ZnO和L-苹果酸按物质的量之比1∶1溶于水中,在室温下静置24 h即可得到[Zn(L-mal)(H₂O)₂]_n。以100 mg [Zn(L-mal)(H₂O)₂]_n为吸附剂,将250μL 1 g/L的联糠醛外消旋体加入其中,并以4.5 mL异丙醇和1 mL甲醇为萃取剂和洗脱剂进行选择性吸附实验,最终滤液使用高效液相色谱仪(HPLC)进行分析。结果表明,[Zn(L-mal)(H₂O)₂]_n对R-联糠醛具有较好的选择性吸附,其对映体过量(ee)值为20%。该工作为CMOF的绿色制备提供了一定的方法和经验并拓展了其在手性分离领域的应用。     

Stereoselective Synthesis and Crystal Structure Analysis of N-Naphthy1-2-deoxy-α-d-ribopyranosylamine

A new compound N-naphthy1-2-deoxy-α-D-ribopyranosylamine was synthesized and structurally determined.It crystallizes in the orthorhombic system,space group P212121 with a =8.361(2),b=12.432(3),C=12.791(4)A,Z=4,V=1329.6(6)A3,DC=1.295 g/cm3,F(000)= 552,C15H17NO3 and Mr=259.30.All the active hydrogen atoms arc involved in the formation of hydrogen bonds in the molecule.     

Synthesis and crystal structure of EnH<Superscript>2</Superscript>[IrCl<Superscript>6</Superscript>]

The preparation of EnH²[IrCl⁶] is described. Crystal data for C₂H₁₀Cl₆IrN₂ are: a = 6.8972(11) Å, b = 6.9435(16) Å, c = 7.3354(11) Å; α = 88.269(3)°, β = 65.495(2)°, γ = 60.305(2)°, V = 270.76(9) ų, space group P1, Z = 1, d_calc = 2.864 g/cm³. Crystal chemical analysis of the general motif of the structure was performed by the translation sublattice identification technique. It has been found that complex anions [IrCl₆]^2? follow the nodes of a rather regular rhombohedral subcell with the parameters a_c = 7.1 Å, α_c = 64°.     

从氧化锌矿制备高纯超细ZnO粉体

超细ＺｎＯ具有表面效应、体积效应、久保效应以及优良的光活性、电活性、烧结活性和催化活性 ,可用来制造气体传感器、荧光体、紫外线遮蔽材料、变阻器、图像记录材料、压电材料、压敏电阻、高效催化剂、磁性材料、陶瓷材料、化妆品及医药材料。在橡胶工业、染料油墨等领域也有应用前景[1～ 5] 。目前 ,国内外对制备超细ＺｎＯ粉体的研究文章较多 ,但以氧化锌矿为原料直接研制的文章还很少。湿化学法是近二十年来超细ＺｎＯ产品应用开发的主要活跃点之一 ,直接沉淀法是制备超细ＺｎＯ的一种重要湿化学方法 ,它是在含有一种或多种粒子的可溶…     

Crystal structure of sodium potassium zinc diphosphate NaKZnP2O7

Single crystals of NaKZnP₂O₇ were grown, and their crystal structure was determined by X-ray diffraction (space group P2₁/n, a = 12.585(5) Å, b = 7.277(5) Å, c = 7.428(5) Å, β = 90.00(5)°, Z = 4, 1916 F(hkl), R ₁ = 0.0461). The structure contains a 3D tetrahedral zinc phosphate framework with a system of intersecting channels running along the b and c axes. The sodium and potassium atoms are coordinated to six and seven oxygen atoms, respectively, and reside inside these channels; the potassium cations, which are larger than the sodium cations, are located at channel intersections.     

Structure,surface analysis and bioactivity of Mn doped zinc oxide nanoparticles

Undoped zinc oxide nanoparticles and Mn (5 atomic % & 10 atomic %) doped zinc oxide nanoparticles were prepared by soft chemical method. Antibacterial, antioxidant and anticancer activities in breast cancer cell line MDAMB231 of prepared nanoparticles were investigated. The nanoparticles were characterized using XRD, SEM, EDAX, UV–Vis, FT-IR, and room temperature PL Analysis. Antimicrobial activity was tested against both gram positive and gram negative human pathogens. The antioxidant potential of prepared nanoparticles was estimated using Phosphomolybdate and DPPH assay. The MTT assay was used for cytotoxicity evaluation of prepared nanoparticles against breast cancer cell line MDAMB231. XRD patterns confirmed the nanoparticles were crystallized hexagonal wurtzite structure with an average size of 38.95 ?nm. The absorption wavelength was observed at 361 ?nm in UV–Vis spectrum of Mn (10 atomic %) doped ZnO nanoparticles. The Mn (5 atomic %) doped ZnO nanoparticles exhibited significant antibacterial activity against the gram negative bacteria Escherichia coli, Klebsiella pneumonia at all concentrations. Undoped zinc oxide nanoparticles and Mn doped zinc oxide nanoparticles were effective against the breast cancer cell line MDAMB231.     

Synthesis and Crystal Structure of o-Methylisourea Hydrosulfate

l INTRODUCTION As an important and capital intermediate of chemi- cal engineering, medicine and pesticide, o-methyli- sourea today is mainly used to synthesize fluoracil antitumor drugs, pesticides and polyantibacterials. According to the applications and syntheses, o- methylisourea is usually prepared as its salts and es- ters, such as o-methylisourea hydrosulfate, o-me- thylisourea sulfate, o-methylisourea acetate, o-methy- lisourea formate, and so on, since o-methylisourea is unstable.…