83690-36-2

Upstream product

• 1313-13-9 manganese(IV) oxide 
• 64-18-6 formic acid 
• 7732-18-5 water 
• 7439-96-5 manganese 
• 16397-91-4 manganese(II) 

Relevant academic research and scientific papers

Cation distribution in MgxMn1-x(HCOO)2·2H2O mixed crystals. X-ray diffraction and double matrix infrared spectroscopy

The isomorphic title series is investigated using single crystal X-ray diffraction and double matrix infrared spectroscopic techniques. The metal ion distribution at the two different metal sites (hexaformate-coordinated Me1 sites and mixed-coordinated Me2 sites) is found to exhibit a slight preference of Mn2+ ions to Me1 sites and Mg2+ ions to Me2 ones. The spectral regions at 2400-2500 cm-1 and 1300-1400 cm-1, corresponding to νOD of matrix-isolated HDO molecules and to symmetric COO stretching (ν2) and bending CH (ν5) modes, respectively, are mostly sensitive to the environment of the metal ion. When Mg2+ and Mn2+ are included in the structures of isotopically dilute Mn(HCOO)2·2H2O and Mg(HCOO)2·2H2O new infrared bands appear, corresponding to νOD of HDO molecules linked to the incorporated ions, and implying that new Mg-OH2···OCHO-Mn and Mn-OH2···OCHO-Mg interactions build up in the mixed formates. These bands appear at small concentrations of included metal ions (about 13 mol% of magnesium ions and 8 mol% of manganese ions, x = 0.13 and x = 0.92, respectively). The ν2 and ν5 modes caused by the incorporated cations bonded to formate ions are detected at x = 0.92 and x = 0.23 (Mn2+ ions in Mg(HCOO)2·2H2O and Mg2+ ions in Mn(HCOO)2·2H2O, respectively). Thus, the analysis of the infrared spectra (positions and intensities of the infrared bands) confirms the single crystal X-ray measurements that the metal ions are localized at the two metal positions. A slight preference of the Mg2+ ions to Me2 sites is owing to the stronger affinity of these ions to water molecules.

Reactions in the M(HCOO)2-CS(NH2)2-H 2O (M = Mg, Mn, Cd) systems at 25°C

Complex formation in the M(HCOO)2-CS(NH2) 2-H2O (M = Mg, Mn, Cd) systems at 25°C is studied using the isothermal solubility method. In the Cd(HCOO)2-CS(NH 2)2-H2O system, a congruently dissolving compound Cd(HCOO)2 ? 2CS(NH2)2 is found and characterized by X-ray powder diffraction and IR spectroscopy. The Mg(HCOO)2-CS(NH2)2-H2O and Mn(HCOO)2-CS(NH2)2-H2O systems are eutonics at this temperature. Data on carbamide and thiocarbamide complexes of divalent metal formates are systematized. Pleiades Publishing, Inc., 2006.

Mn(III) containing ferrites in the system Li0.5Fe(2.5-x)Mn(x)O4

The decomposition of freeze-dried Li-Mn(II)-Fe(III)-formate precursors at temperatures in the region of 600°C - 900°C in air yields complex oxides Li0.5Fe(2.5-x)Mn(x)O4 (0 x 1.5) with cubic spinel structure. These ferrites contain Mn(III) ions on octahedral sites of the spinel lattice. The cation distribution and the properties ofthe single phase Li-Mn-ferrites with x = 0.5, 1.0 and 1.5 were studied by X-ray powder diffraction, infrared spectroscopy, (57)Fe-Moessbauer sp ectroscopy and magnetization measurements. In contrast to the lithium ferrite (li0.5Fe2.5O4, x = 0), where the Li ions only occupy octahedral sites, the Li ions in the Li-Mn-ferrites are found on both octahedral and tetrahedral cationic positions of the spinel lattice.

Solubility Behavior of the Sr(HCOO)2-Mn(HCOO)2-H2O System at 25°C

By means of isothermal precipitation at 25°C, the solubility diagram for the Sr(HCOO)2-Mn(HCOO)2-H2O system is constructed and the range of existence of the solid phases (strontium and manganese(II) formate dihydrates) are established by X-ray diffraction analysis and IR spectroscopy. Precipitation of strontium formate dihydrate from aqueous solutions containing a 54Mn radiotracer is studied. No reactions between strontium and manganese(II) formates are shown to take place in the ranges of trace and high concentrations of manganese(II), which is incorporated into Sr(HCOO)2 · 2H2O crystals only with mother-liquor occlusions.