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.
Decomposition of organic salts of some d and f metals: Non-isothermal kinetics and FT-IR studies
Vlase,Vlase,Chiriac,Doca
, p. 839 - 845 (2008/10/08)
The thermal decomposition in non-isothermal conditions of formates, acetates, propionates and butyrates of Mn, Co, Zn, Cd, Eu, Sm and Ni was studied. The observed compensation effect allows us to calculate the isokinetic temperature. A selective activation mechanism was suggested. This leads to a good agreement between kinetic and spectroscopic data.
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.
Structurally diverse manganese(III) complexes of tetradentate N2O2 Schiff-base ligands with ancillary carboxylate donors
Hulme, Charlotte E.,Watkinson, Michael,Haynes, Michaela,Pritchard, Robin G.,McAuliffe, Charles A.,et al.
, p. 1805 - 1814 (2007/10/03)
A number of manganese(III) complexes of tetradentate N2O2 Schiff-base ligands have been prepared with various additional carboxylate anions.Five of these compounds have been crystallographically characterised revealing that a remarkable array of structural chemistry is available.A polymeric species is observed for n> 1, whereas a monomeric species is found in t)> 2 .The anti-anti bridging of the manganese centres in 1 is in contrast to that in 2n> 3 (H2bsaltn = 5-bromo-derivative of H2saltn), which exhibits rare syn-anti bridging; 3 also contains a dimeric repeat unit due to an alternate 180 degree twist in the polymeric chain necessitated by steric constraints.In contrast, the complexes containing the dianion of N,N'-bis(3-methoxysalicylidene)ethane-1,2-diamine (H2msalen) appear to be isostructural, 2>*EtOH 4 and n)>2> 5 being structurally characterised as essentially identical phenoxy-bridged dimers.An insoluble material of stoichiometry Mn4(O2CR)3(saltn)3(H2O)n (n = 0-3) was isolated from all reactions involving the saltn ligand; attempts to characterise these compounds by X-ray diffraction have been unsuccessful.However, the previously characterised manganese(IV) dimer 2>*2dmf 6 (dmf = dimethylformamide) and the monomeric species 7 were isolated in attempts to crystallise these materials.
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.
Catalyzed process for producing metal carboxylates for use as animal feed supplements
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, (2008/06/13)
A catalyzed process is disclosed for producing a polyvalent metal C2 -C3 carboxylate having the formula M(CH3 (CH2)x COO--)y, wherein M is the polyvalent metal cation that is manganese (Mn+2), cobalt (Co+2), or chromium (Cr+3), x is zero or 1 and y is an integer equal to the cationic charge of M. The polyvalent metal C2 -C3 carboxylate is prepared by admixing (i) a dry polyvalent metal compound that is an oxide, hydroxide or carbonate of Mn+2, Co+3 or Cr+3, (ii) an anhydrous C2 -C3 carboxylic acid, and (iii) a catalytic agent at a relative molar ratio of about 1:2-10:0.01-3 in the absence of an added solvent or other diluent to form a reaction mixture. The reaction mixture is heated to complete the reaction, remove the produced water and about 80 percent of the unreacted carboxylic acid. The product in residual carboxylic acid is solidified, ground and the product is recovered. The metal carboxylates can be used as biologically available and economical sources of trace metal ions for supplementation in animal diets.
THE DIRECT ELECTROCHEMICAL SYNTHESIS OF SOME TRANSITION METAL CARBOXYLATES
Kumar, N.,Tuck, Dennis G.,Watson, Katherine D.
, p. 740 - 743 (2007/10/02)
The transition metal carboxylates M(O2CR)n (M=Cr, R=C2H5, C6H5, n=3; M=Mn, Fe, Ni, R=CH3, C2H5, C6H5, n-C7H15, n=2, not all combinations) have been prepared by oxidising suitable metal anodes electrochemically in solutions of RCOOH in acetonitrile.With Co and Cu, a wide range of carboxylic acids (R=C2H5, c-C3H5, c-C5H9, C6H5, n-C4H9, n-C7H15, 2-ethylhexanoic, oleic, linoleic) has been used succesfully to give M(O2CR)2.The advantages of the method are discussed.The preparation of Cu(O2CR)2 involves the prior formation of CuO2CR at the anode, followed by oxidation by the solvent.
