- Modeling of the alcohol dehydrogenase active site: Two different modes of alcohol binding in crystals of zinc and cadmium Tri-tertbutoxysilanethiolates evidenced by X-ray diffraction and solid-state vibrational spectroscopy
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Two different modes of binding methanol and ethanol were found in crystals of heteroleptic zinc and cadmium complexes with MS2NO2 and MS2NO kernels and with a general formula M(RS)2(im) (M = Zn, Cd; RS = tri-ter
- Dolega, Anna,Baranowska, Katarzyna,Gudat, Dietrich,Herman, Aleksander,Stangret, Janusz,Konitz, Antoni,Smiechowski, Maciej,Godlewska, Sylwia
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- Formation, crystal and molecular structures of heteroleptic zinc(II) tri-tert-butoxysilanethiolates with ZnNO2S2 and ZnN 2S2 coordination pattern
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Five zinc tri-tert-butoxysilanethiolates containing heterocyclic, aromatic bases coordinated to zinc ion were synthesized. All obtained complexes are monomeric with ZnS2NO2 or ZnS2N2 core and formula: Zn(SSi(OBu
- Do??ga,Becker,Chojnacki,Konitz,Wojnowski
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- Doping metal ions only onto the catalyst surface
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A new method to dope Zn2+ ions only onto the surface of titanium dioxide is proposed here. The photocatalyst TiO2(-Zn) exhibits higher photocatalytic activity than pure TiO2 for the degradation of methyl orange in water. The activity increases when separate ZnO phase is removed via an acid treatment. The results of FT-IR, XRD, AAS and XPS analysis show that the Zn2+ ions are located on the surface of TiO2 nanoparticles and bonded with oxygen atoms around it. The Zn2+ ions on the surface inhibit electron-hole pair recombination as a charge separation center.
- Xu, Ji-Chuan,Shi, Yan-Li,Huang, Ji-Er,Wang, Bo,Li, Hu-Lin
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- Size- and shape-controlled synthesis of ZnSe nanocrystals using SeO 2 as selenium precursor
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Here we report a low-cost and "green" phosphine-free route for the size- and shape-controlled synthesis of high-quality zinc blende (cubic) ZnSe nanocrystals. To avoid the use of expensive and toxic solvents such as trioctylphosphine (TOP) or tributylphosphine (TBP), SeO2 was dispersed in 1-octadecene (ODE) as a chalcogen precursor. It has been found that the temperature and the surface ligand influenced the nucleation, the reaction speed and the formation of different shapes. Absorption spectroscopy, fluorescence spectroscopy, powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used for the characterization of the as-synthesized ZnSe nanocrystals. The size-dependent photoluminescence (PL) range of the as-prepared ZnSe nanocrystals was between 390 and 450 nm, with the PL full width at half-maximum (FWHM) well controlled between 14 and 18 nm and PL quantum yields reached up to 40% at room temperature. Moreover, this new selenium precursor can be used to form tetrapod-shaped ZnSe nanocrystals when zinc acetylacetonate was introduced as the zinc precursor with a one-pot method.
- Shen, Huaibin,Niu, Jin Zhong,Wang, Hongzhe,Li, Xiaomin,Li, Lin Song,Chen, Xia
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- Zinc ions surface-doped titanium dioxide nanotubes and its photocatalysis activity for degradation of methyl orange in water
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Zn ions surface-doped TiO2 nanotubes were synthesized via an assembly process based on ligand exchange reaction and with additional thermal treatment. First the ligand exchange reaction between zinc acetylacetonate and hydroxide radicals on TiO2 surface introduced the Zn ions onto the surface of TiO2 nanotubes, then the Zn(acac)2 assembled TiO2 nanotubes were calcined at an optimal temperature (400°C) to eliminate the organic ligands. The as-prepared Zn ions surface-doped TiO 2 nanotubes showed a further improvement on the photocatalysis activity for degradation of methyl orange in water.
- Xu, Ji-Chuan,Lu, Mei,Guo, Xin-Yong,Li, Hu-Lin
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- Effect of technique of applying layers of metal acetylacetonates on acid-base and chromatographic properties of sorbents
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A series of chromatographic sorbents, which differ by way of applying modifying chelates of acetylacetone was obtained. The acid-base and chromatographic properties of sorbents with thermally and chemically grafted layers of metal acetylacetonates were investigated. It was shown that the modifi cation of the mineral sorbents with metal acetylacetonates leads to a change in the surface acidity, as well as to an increase in the polarity and selectivity with respect to different classes of compounds.
- Slizhov, Yu. G.,Matveeva,Minakova
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p. 1376 - 1382
(2014/01/06)
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- The direct electrochemical synthesis of transition metal acetylacetonates
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Acetylacetonates were prepared electrochemically in good yield using the pure liquid ligand, acetylacetone, as the solvent, in which the supporting electrolyte, tetra-n-butyammonium hexafluorophosphate, was dissolved; the metal of interest served as the electrodes. The products were characterized by UV-visible spectrometry (color) and mass spectrometry. Both a lower, M(AcAc)2, and a higher, M(AcAc)3, oxidate state were formed for the cobalt and manganese systems; the identity of the product(s) could be biased by a careful choice of the potential used for the synthesis.
- Long,Lagowski
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p. 813 - 815
(2008/10/09)
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- Synthesis of zinc β-diketonates
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Acetylacetonatozinc and trifluoroacetylacetonatozinc chelates have been prepared by electrolysis and ligand exchange. Their compositions were determined by elemental analysis, IR spectroscopy, thermogravimetry (TGA), and differential thermal analysis (DTA
- Vinokurov,Shirokii,Kostyuk,Dik,Tereshko
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p. 577 - 580
(2008/10/09)
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- Process for making metal acetylacetonates
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The present invention provides an improved, economical and environmentally benign process for metal complexes of acetylacetone having the general formula, M(acac)n wherein M is a metal cation selected from the group consisting of Fe, Co, Ni, Cu, Zn, Al, Ca, Mg, Mo, Ru, Re, U, Th, Ce, Na, K, Rb, Cs, V, Cr, and Mn etc., n is an integer which corresponds to the electrovalence of M, are obtained by reacting the corresponding metal hydroxide, metal hydrated oxide or metal oxide with a stoichiometric amount of acetylacetone and separating the product.
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Page/Page column 4
(2010/02/07)
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- PROCESS FOR THE PREPARATION OF METAL ACETYLACETONATES
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The present invention provides an improved, economical and environmmentally benign process for metal complexes of acetylacetone having the general formula, M(acac)n wherein M is a metal cation selected from the group consisting of Fe, Co, Ni, Cu, Zn, Al, Ca, Mg, Mo, Ru, Re, U, Th, Ce, Na, K, Rb, Cs, V, Cr, and Mn etc., n is an integer which corresponds to the electrovalence of M, are obtained by reacting the corresponding metal hydroxide, metal hydrated oxide or metal oxide with a stoichiometric amount of acetylacetone and separating the product.
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- Solid-phase synthesis of zinc(II) β-diketonates upon mechanical activation
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Mechanically activated solid-phase reactions between zinc chloride and sodium β-diketonates are studied. The course of the reaction, the product yield, and some properties of the activated mixtures are studied in relation to mechanical treatment conditions and the nature of β-diketone. Zinc β-diketonates are separated by sublimation from the activated mixtures in >70% yield. Unsolvated zinc β-diketonates are characterized by physicochemical methods.
- Petrova,Borisov,Makhaev
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p. 1827 - 1832
(2008/10/08)
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- Direct Synthesis of Ethanol over a Cu-Zn Catalyst in the Liquid Phase
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Cu-Zn and Cu-Al catalysts generated by reduction of Cu(acac = acetylacetonato) with ZnEt2 or AlEt3, are shown to produce oxygenated compounds from syngas in the liquid phase under pressure; high selectivities for ethanol are observed, especially with the Cu-Zn system (45.7 molpercent) in the early stages of the reaction.
- Simon, Michel,Mortreux, Andre,Petit, Francis
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p. 1445 - 1446
(2007/10/02)
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- Enthalpies of Fusion of Aluminium(III), Chronium(III), Zirconium(IV), and Zinc(II) Acetylacetonates
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The melting points and enthalpies of fusion of aluminium(III), chromium(III), zirconium(IV), and zinc(II) acetylacetonates have been measured by differential scanning calorimetry.
- Grinberg, Ya. Kh.,Lazarev, V. B.,Zavernyaev, A. Yu.,Shreider, V. A.,Chepik, S. D.
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p. 630 - 631
(2007/10/02)
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