5970-62-7Relevant articles and documents
Mechanosynthesis of multiferroic hybrid organic-inorganic [NH4][M(HCOO)3] M = Co2+,Mn2+,Zn2+,Ni2+, Cu2+ formate-based frameworks
Bersani, Danilo,Calestani, Davide,Cugini, Francesco,Gemmi, Mauro,Griesi, Andrea,Orlandi, Fabio,Righi, Lara,Solzi, Massimo,Vit, Valentina
supporting information, (2021/12/23)
The family of compounds with formula [NH4][M(HCOO)3], with M a divalent D-metal, is characterized by porous frameworks hosting NH4+ cations exhibiting at low temperature a spontaneous ferroelectric polarization. The presence of magnetically active divalent metal determines the occurrence of antiferromagnetic ordering below 30 K opening the avenue for a rational formulation of a new class of multiferroic materials. We demonstrate that this intriguing class of compounds can be synthetized with a mechanochemical approach. This novel route of synthesis was applied to the series [NH4][M(HCOO)3] with M= Cu2+, Co2+, Mn2+, Zn2+ and Ni2+ using as reactants ammonium formate and the corresponding di-hydrated metal formates. The milling duration of the process correlates with the thermal stability of the di-hydrated metal formates indicating that the first step of the mechanosynthesis process is represented by the removal of water molecules. The characterizations of the final products indicate the presence of single phase [NH4][M(HCOO)3] compounds with an excellent degree of crystallinity.
Surface-Modified CdS/ZnO Material: Single-Reactor Synthesis and Mechanism of Formation in Aqueous Solution
Kozhevnikova,Gyrdasova,Baklanova,Buldakova, L. Yu.,Yanchenko, M. Yu.,Vorokh
, p. 454 - 462 (2018/06/11)
Method of chemical precipitation from aqueous solutions was used to cover the surface of polycrystalline ZnO nanotubes with a nanostructured CdS layer. The thus synthesized CdS/ZnO composite material was studied by the methods of X-ray diffraction analysis, electron microscopy, and optical spectroscopy. The fundamental time-related aspects of the process of CdS formation on the ZnO surface were examined. It was found that the amount of deposited CdS nanoparticles is independent of the deposition duration. The morphological specific features of ZnO nanotubes are preserved upon a prolonged keeping of ZnO in solution. The photocatalytic activity of CdS/ZnO under visible and UV light was examined in the reaction of hydroquinone oxidation. A possible mechanism of how the CdS/ZnO composite is formed in an aqueous solution in the course of growth of a layer constituted by CdS nanoparticles on the surface of ZnO nanotubes is suggested on the basis of the experimental data. It is demonstrated that the chemical-precipitation method can be used to obtain surface-active composite materials that are photoactive in the visible spectral range.
Synthesis and structure of quasi-one-dimensional zinc oxide doped with manganese
Gyrdasova,Krasil'nikov,Shalaeva,Kuznetsov,Tyutyunnik
, p. 72 - 78 (2012/05/07)
Nanotubes of manganese-doped zinc oxide Zn1 - xMnxO (0 ≤ x ≤ 0.2) were synthesized by heating the Zn1 - xMn 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 - xMnx(HCOO)2 · 2H2O with an ethylene glycol excess at 100-130°C. The tubular morphology of Zn 1 - xMnxO particles was identi- fied 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 photo- electron spectroscopy suggested that the manganese distribution on the outer surface layer of Zn1 - xMn xO nanotubes is nonuniform. Pleiades Publishing, Ltd., 2012.
Synthesis and photocatalytic properties of low-dimensional cobalt-doped zinc oxide with different crystal shapes
Krasil'nikov,Gyrdasova,Buldakova, L. Yu.,Yanchenko, M. Yu.
, p. 145 - 151 (2011/05/04)
The glycoxide complexes Zn1-x Co x (HCOO)(HOCH 2CH2O)1/2 and Zn1-x Co x (OCH2CH2O) (0 ≥ x ≥ 0.3) have been synthesized by heating ethylene glycol solutions of zinc formate Zn(HCOO)2 ? 2H2O or its mixtures with cobalt formate Co(HCOO)2 ? 2H2O. The crystals of these complexes have the shape of filaments (needles, bars) and distorted octahedra, respectively. A new method in which these complexes are used as the precursor is suggested for the synthesis of low-dimensional wurtzite-like Zn1-x Co x O. The shape of the precursor crystals is fully inherited by Zn1-x Co x O resulting from their heat treatment. The Zn1-x Co x O solid solutions show high photocatalytic activity in hydroquinone oxidation in aqueous solution under UV or blue light irradiation, and their activity increases as their cobalt content is increased.
Solution synthesis and characterization of indium-zinc formate precursors for transparent conducting oxides
Pasquarelli, Robert M.,Curtis, Calvin J.,Miedaner, Alexander,Van Hest, Maikel F.A.M.,OHayre, Ryan P.,Ginley, David S.
, p. 5424 - 5431 (2010/08/05)
A series of In-Zn formate mixtures were investigated as potential precursors to amorphous In-Zn-oxide (IZO) for transparent conducting oxide (TCO) applications. These mixtures were prepared by neutralization from formic acid and characterized by elemental analysis, IR spectroscopy, powder X-ray diffraction, and thermogravimetry-differential scanning calorimetry (TG-DSC) measurements. Thermal analysis revealed that a mixture of In and Zn formates reduced the overall decomposition temperature compared to the individual constituents and that OH-substitution enhanced the effect. In terms of precursor feasibility, it was demonstrated that the decomposition products of In-Zn formate could be directed toward oxidation or reduction by controlling the decomposition atmosphere or with solution acid additives. For TCO applications, amorphous IZO films were prepared by ultrasonic spray deposition from In-Zn formate solutions with annealing at 300-400 °C.
Thermodynamic properties and thermal stability of the synthetic zinc formate dihydrate
Zhang,Liu,Zeng,Xu,Sun,You,Sawada
, p. 861 - 866 (2009/01/31)
Zinc formate dihydrate has been synthesized and characterized by powder X-ray diffraction, elemental analysis, FTIR spectra and thermal analysis. The molar heat capacity of the coordination compound was measured by a temperature modulated differential scanning calorimetry (TMDSC) over the temperature range from 200 to 330 K for the first time. The thermodynamic parameters such as entropy and enthalpy vs. 298.15 K based on the above molar heat capacity were calculated. The thermal decomposition characteristics of this compound were investigated by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). TG curve showed that the thermal decomposition occurred in two stages. The first step was the dehydration process of the coordination compound, and the second step corresponded to the decomposition of the anhydrous zinc formate. The apparent activation energy of the dehydration step of the compound was calculated by the Kissinger method using experimental data of TG analysis. There are three sharply endothermic peaks in the temperature range from 300 to 650 K in DSC curve.
Lithium-promoted hydrogenation of carbon dioxide to formates by heterobimetallic hydridozinc alkoxide clusters
Merz, Klaus,Moreno, Mariluna,Loeffler, Elke,Khodeir, Lamy,Rittermeier, Andre,Fink, Karin,Kotsis, Konstantinos,Muhler, Martin,Driess, Matthias
, p. 73 - 75 (2008/09/18)
The remarkably distinct reactivity of hydridozinc heterobimetallic cubanes [(HZnOtBu)4-n(thf·LiOtBu)n] 1a-1d towards CO2 is reported - the hydride transfer from Zn-H to CO2 is drastically a
The physicochemical and biological properties of zinc(II) complexes
Szunyogova, Erika,Mudronova, Dagmar,Gyoeryova, Katarina,Nemcova, Radomira,Kovarova, Jana,Piknova-Findorakova, Lenka
, p. 355 - 361 (2008/10/09)
Spectroscopic (IR), thermoanalytical (TG/DTG, DTA) and biological methods were applied to investigate physicochemical and biological properties of seven zinc(II) complex compounds of the following formula Zn(HCOO)2? 2H2O (I), Zn(HCOO
Double formates Ba2M(HCOO)6(H2O) 4 (M = Co, Ni, Cu, Zn): Crystal structures and hydrogen bonding systems
Baggio,Stoilova,Polla,Leyva,Garland
, p. 173 - 180 (2007/10/03)
The crystal structures of four members in the isomorphous series, Ba 2M(HCOO)6(H2O)4 (M=Co, Ni, Cu, Zn) are presented and thoroughly discussed. Discrepancies with a previous structural report on the Cu isolog [Z. Kristallogr. 110 (1958) 231] were cleared out through a re-refinement of the original data, the outcome of which definitely confirmed the present results. The strengths of the hydrogen bonds in the title compounds as deduced from the infrared wavenumbers of the uncoupled OD stretches of matrix-isolated HDO molecules are discussed in terms of the O w?O hydrogen bond lengths, the different hydrogen bond acceptor capabilities of the formate oxygen atoms and the weak Ba-OH2 interactions. The proton acceptor strength of the oxygen atoms is evaluated within the framework of the Brown's bond-valence theory. The intramolecular OH bond lengths are derived from the novel νOD vs. rOH correlation curve [J. Mol. Struct. 404 (1997) 63].
Solubility and composition of solid phases in Ba(HCOO)2-Zn(HCOO)2-H2O system at 25°C
Fakeev,Samofalova,Iskhakova,Zhadanov
, p. 187 - 191 (2007/10/03)
The solubility in the Ba(HCOO)2-Zn(HCOO)2-H2O system was studied at 25°C in a wide range of component concentrations. The composition of solid phases was determined by chemical and X-ray analyses and by IR spectroscopy. The unit cell parameters of Ba(HCOO)2, Zn(HCOO)2 · 2H2O, and Ba2Zn(HCOO)6 · 4H2O were refined.
