21129-18-0Relevant articles and documents
Metal carboxylate salts
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Page/Page column 2-3, (2008/06/13)
A dietary source of mineral in the form of a metal carboxylate is prepared using the acid-base-like reaction. A salt of a carboxylate anion and a by-product cation is reacted in aqueous solution with a salt of a metal cation and a by-product anion under conditions which form a metal carboxylate and the by-product salt. Solutions formed in the reaction may be applied directly to a dry carrier to produce a dry dietary supplement or, alternatively, the solutions may be filtered to remove precipitated by-product salt and the filtrate used as a liquid dietary supplement. Preferably, a reducing agent, such as ascorbic acid, is added to help prevent the oxidation of divalent to trivalent form of a metal salt, when an easily oxidized divalent metal is used as starting material.
Thermal decomposition of freeze-dried μ-oxo-carboxylates of manganese and iron
Langbein,Christen,Bonsdorf
, p. 173 - 180 (2008/10/09)
The decomposition of freeze-dried mixed carboxylates of manganese and iron was investigated by means of DTA, TG, mass spectroscopy and X-ray powder diffractometry. The three main steps of decomposition are characterized as release of (a) H2O, (b) carboxylic acid and CO2/CO, and (c) the corresponding carbonyl compound and CO2. In particular, the course of process (b) strongly depends on the stability of the metal-carboxylate link in the three investigated carboxylates. Well-crystallized single-phase manganese ferrites can be obtained on decomposition of formates of appropriate composition and thermal treatment of decomposition products at 600°C while maintaining a p(O2) within the coexistence field of manganese ferrite.
Metal propionate synthesis of magnetoresistive La1-x(Ca,Sr)xMnO3 thin films
Hasenkox, Ulrich,Mitze, Carsten,Waser, Rainer
, p. 2709 - 2713 (2008/10/08)
A flexible chemical solution deposition (CSD) method for the preparation of magnetoresistive La1-x(CaySr)xMnO3 thin films based completely on metal propionates is presented. A number of polycrystalline thin films with varying stoichiometries were deposited on different substrate materials at temperatures between 550° and 850°C. The crystallization behavior on selected substrates was found to depend on the thin film stoichiometry. Magnetoresistivity and magnetization were measured as a function of temperature. For the selected samples, a magnetic Curie temperature TC, a metal-semiconductor transition, and magnetoresistive behavior were observed. These measurements demonstrated that La1-x(CaySr)xMnO3 thin films with properties well known from films deposited by PLD or sputtering can be prepared by a simple, propionate-besed CSD method.