142-72-3Relevant articles and documents
Aerogel processing of MTi2O5 (M = Mg, Mn, Fe, Co, Zn, Sn) compositions using single source precursors: Synthesis, characterization and photocatalytic behavior
Kapoor,Uma,Rodriguez,Klabunde
, p. 145 - 150 (2005)
Oxide semiconductor photocatalysts based on TiO2 (band gap of 3.2 eV) are normally used to destroy organics under UV irradiation. Currently we have been focused on the aerogel synthesis of nanocrystalline photocatalysts that will destroy organic compounds such as acetaldehyde using visible and UV radiations. Herein we report the results of our attempts to synthesize mixed metal oxides of the type MTi2O5 (M = Mg, Mn, Fe, Co, Zn, and Sn). The preparation method involves the formation of a single source precursor by the condensation reaction of Ti(OPrn)4 with M(OAc)2, followed by their (M[O-Ti(OPrn)3] 2) hydrolysis and drying under supercritical conditions by a modified aerogel process. Product compositions, oxide structure types, and morphology were characterized by powder X-ray diffraction, scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDXA), and BET surface area measurements. Only for Mg, the stoichiometry MgTi2O5 with pseudo-brookite structure type was obtained, while the composites MTiO 3/TiO2 were obtained for M = Fe, Co and Zn. Photocatalytic behavior of these composite oxides were tested by the decomposition of gaseous acetaldehyde under UV light (320 nm 3/TiO2 showed an interesting catalytic behavior; it decomposed acetaldehyde in the dark, at room temperature. Other mixed metal oxides such as MgTi2O5, and composites such as FeTiO 3/TiO2 and ZnTiO3/TiO2 decomposed acetaldehyde only under UV light (not under visible light or in the dark). The photocatalytic activity was compared with the reference degussa P25 TiO 2 photocatalyst.
Controlled synthesis of lead magnesium tantalate
Nikishina,Lebedeva,Drobot
, p. 1411 - 1416 (2014)
The results of elaborating a method for controlled synthesis of the ferroelectric phase of lead magnesium tantalate having the perovskite structure and distinguished by high phase homogeneity are reported.
On the nature of calcium magnesium acetate road deicer
Miller, Jennifer R.,LaLama, Matthew J.,Kusnic, Rachel L.,Wilson, Darian E.,Kiraly, Paije M.,Dickson, Samuel W.,Zeller, Matthias
, p. 1 - 10 (2019)
CMA (calcium magnesium acetate) road deicers have gained popularity in recent years as an environmentally friendly alternative to traditional rock salt, and as an industrial adsorbent for removing H2S and other odorous acid gases from gas streams. Despite its increasing commercial use, its exact composition and crystalline structure remained unknown, with subsequent problems in evaluating properties of commercial CMA. Various synthetic routes towards formation of crystalline calcium magnesium acetates were investigated. From aqueous solutions preferential formation of calcium monohydrates or calcium monohydrate acetic acid solvates is observed. Crystals of genuine mixed metal calcium-magnesium acetate were obtained from hot glacial acetic acid. Material suitable for analysis by single crystal X-ray diffraction, SC-XRD, was obtained by slight reduction of solvent volume at 80 °C for several hours. CMA crystallizes in the orthorhombic space group Pnma with a formula of Mg2Ca(OAc)6 (OAc = acetate anion), with a magnesium to calcium ratio of two to one. Under the same conditions, but in the absence of magnesium, the acetic acid solvate of calcium acetate, Ca(OAc)2(HOAc), is obtained, which is also described. Multicrystalline XRD and EDS analysis data of ground CMA samples match those of commercial CMA. Single crystal structural analysis finds an unusually large unoccupied void space of 9.4% of the unit cell volume. Thermal gravimetric analysis, TGA, gives an upper limit of one water molecule per formula unit of CMA, leaving the void space at least partially unoccupied. This helps to better understand CMAs unusually low density, which had been an issue when used as a commercial road deicer, having been described as being easily blown off road surfaces when applied in crystalline or powder form.
Optimisation of a sol-gel synthesis route for the preparation of MgF2 particles for a large scale coating process
Scheurell,Noack,K?nig,Hegmann,Jahn,Hofmann,L?bmann,Lintner,Garcia-Juan,Eicher,Kemnitz
, p. 19501 - 19508 (2015)
A synthesis route for the preparation of optically transparent magnesium fluoride sols using magnesium acetate tetrahydrate as precursor is described. The obtained magnesium fluoride sols are stable for several months and can be applied for antireflective coatings on glass substrates. Reaction parameters in the course of sol synthesis are described in detail. Thus, properties of the precursor materials play a crucial role in the formation of the desired magnesium fluoride nanoparticles, this is drying the precursor has to be performed under defined mild conditions, re-solvation of the dried precursor has to be avoided and addition of water to the final sol-system has to be controlled strictly. Important properties of the magnesium fluoride sols like viscosity, particle size distribution, and structural information are presented as well.
Magnesium acetate tetrahydrate, process for preparing same and application of magnesium acetate tetrahydrate
-
Paragraph 0038-0067, (2017/08/27)
The invention discloses magnesium acetate tetrahydrate, a process for preparing the same and application of the magnesium acetate tetrahydrate. The process includes steps of synthesis, reaction, pressure filtration, concentration, re-concentration, crystallization, centrifugal discharging, drying and packaging. The magnesium acetate tetrahydrate, the process and the application have the advantages that concentration is divided into two portions, accordingly, energy can be saved, the process is high in efficiency and is simple, procedures are easy to control, raw materials for the magnesium acetate tetrahydrate are low in cost and are easily available, and the magnesium acetate tetrahydrate is low in production cost; the magnesium acetate tetrahydrate prepared by the aid of the process is a white crystal in appearance and is stable in quality; a molecular formula of the magnesium acetate tetrahydrate is C4H14O8Mg, the molecular weight of the magnesium acetate tetrahydrate is 214.46, the density of the magnesium acetate tetrahydrate is 0.8 g/l, and the melting point of the magnesium acetate tetrahydrate is 72-80 DEG C; the content of the magnesium acetate tetrahydrate is higher than 98%, the content of chlorine is 320-350 ppm, and a pH (potential of hydrogen) value of the magnesium acetate tetrahydrate is stable and keeps ranging from 7 to 9; the magnesium acetate tetrahydrate can be used for feed additives, cosmetics, catalysts and organic synthesis intermediates, can be applied to preparing magnesium uranyl acetate for measuring sodium and can be applied to the aspects of deodorization, sterilization, preservatives, textile dyeing, eosin staining, nigrosine immobilizing and the like.
Synthesis and reactivity of magnesium complexes supported by tris(2-dimethylaminoethyl)amine (Me6tren)
Guard, Louise M.,Hazari, Nilay
, p. 2787 - 2794 (2013/06/27)
The reaction of tris(2-dimethylaminoethyl)amine (Me6tren) with Grignard reagents and related Mg precursors has been investigated. Treating Me6tren with 2 equiv of PhMgBr in diethyl ether resulted in the formation of [(Me6tren)MgBr]Br (1), in which Me6tren is bound in a κ4 fashion. This is the first example of a Mg complex containing Me6tren or a related tris(aminoethyl)amine ligand. In contrast, when MeMgBr was treated with either 1 or 2 equiv of Me 6tren, a mixture containing 1 and the alkyl species [(Me 6tren)MgMe]Br (3) was produced. It was not possible to separate the two compounds to generate a pure sample of 3. Reaction between Me 6tren and greater than 4 equiv of MeMgBr formed [(Me 6tren)MgBr]2[MgBr4] (4), an analogue of 1 with a different counterion. The highly unusual dialkyl Mg compound (Me 6tren)MgMe2 (5), which features a κ3- bound Me6tren ligand, was synthesized through the reaction of Me 2Mg with Me6tren. The reaction of 5 with excess phenylacetylene or carbon dioxide yielded (Me6tren)Mg(CCPh) 2 (6) and Mg(OAc)2, respectively, while treatment with benzylalcohol, benzylamine, 4-tert-butylcatechol, 4-tert-butylphenol, and aniline all resulted in decomposition. The addition of 1 equiv of 2,6-lutidine·HBArF (BArF = tetrakis(3,5- bis(trifluoromethyl)phenyl)borate) to 5 formed [(Me6tren)MgMe] BArF (7), a rare example of a neutral ancillary ligand supported cationic monoalkyl Mg species. Compounds 1, 4, and 5 have been crystallographically characterized.
Structural chemistry of magnesium acetates
Scheurell, Kerstin,Koenig, Rene,Troyanov, Sergey I.,Kemnitz, Erhard
, p. 1265 - 1273 (2012/08/13)
Magnesium acetate solvates, Mg(OAc)2·nL, and their hydrates were prepared by crystallization of Mg(OAc)2·4H 2O or Mg(OAc)2 from different solvents (L = MeOH, EtOH, HOAc). Anhydrous Mg(OAc)2 was obtain
Salts of Fatty Acids and Methods of Making and Using thereof
-
, (2009/07/25)
Disclosed are methods of making salts of fatty acids (e.g., marine oils) and to salts prepared by the disclosed methods. Methods of using the disclosed salts are also disclosed.
Method for the preparation of metal salts of phosphorus acid esters
-
, (2008/06/13)
Method for preparing metal salts of phosphorus acid esters comprising reacting metal salts of organic acids with phosphorus acid esters. By-product removal is facilitated such that high purity products are produced. Products are particularly useful as support materials in the preparation of highly active alpha-olefin polymerization catalyst components.
Metal hydrates and salts of carboxylic acids
-
, (2008/06/13)
A metal salt of a carboxylic acid is formed by contacting a carboxylic acid with an activated metal. The activated metal is formed by combining a first metal with a second metal which has an affinity for hydrogen in the presence of a proton source. Typically, an activated aluminum is formed from a highly pure aluminum rod combined with an alloy of indium and gallium in the presence of hydrochloric acid. The addition of excess water in the presence of the carboxylic acid and activated metals forms a polymeric metal salt from a water soluble carboxylic acid.
