New Polyampholyte Polymers Based on Polypropylene Glycol Fumarate with Acrylic Acid and Dimethylaminoethyl Methacrylate

The possibility of preparing new polyampholyte polymers based on polypropylene glycol fumarate–acrylic acid–dimethylaminoethyl methacrylate terpolymers was demonstrated. The main relationships of radical terpolymerization in dioxane, including binary systems participating in the terpolymerization, were studied. The block lengths, transition probabilities, and Harwood block structure parameter were calculated for the terpolymers from the copolymerization constants for the binary systems. These parameters reflect the arrangement of the macroradicals in the chain. The morphology of the polymer surface was studied by scanning electron microscopy, and the surface pore size was estimated. The influence of organic solvents and pH on the sample swelling was studied, and the isoelectric point (pH 6.00) of the terpolymer was determined.     

Synthesis and X-ray diffraction study of manganites LaM 3I M 3II Mn4O12(MI= Li, Na, K; MII = Mg, Ca)

Manganites LaM ₃ ^I M ₃ ^II Mn₄O₁₂(M^I = Li, Na, K; M^II = Mg, Ca) have been synthesized for the first time by the solid-phase reactions of lanthanum(III) and manganese(II) oxides and lithium, sodium, potassium, magnesium, and calcium carbonates. X-ray diffraction shows that all of them crystallize in the cubic crystal system. Their unit cell parameters are determined. Original Russian Text ? B.K. Kasenov, E.S. Mustafin, M.A. Akubaeva, Zh.I. Sagintaeva, S.T. Edil’baeva, Sh.B. Kasenova, S.Zh. Davrenbekov, Zh.S. Bekturganov, 2007, published in Zhurnal Neorganicheskoi Khimii, 2007, Vol. 52, No. 9, pp. 1433–1435.     

Manganites NdMg<Stack><Subscript>3</Subscript><Superscript>I</Superscript></Stack>Mg<Subscript>3</Subscript>Mn<Subscript>4</Subscript>O<Subscript>12</Subscript> (M<Superscript>I</Superscript> = Li,Na, K): X-ray diffraction data

NdLi₃Mg₃Mn₄O₁₂, NdNa₃Mg₃Mn₄O₁₂, and NdK₃Mg₃Mn₄O₁₂ manganites were synthesized for the first time by solid phase reactions of neodymium(III) and manganese(III) oxides with lithium, sodium, potassium, and magnesium carbonates. X-ray diffraction showed that the compounds crystallized in the tetragonal crystal system. Their unit cell parameters were determined.     

Synthesis and X-ray diffraction study of ferrites ErM<Superscript>I</Superscript>Fe<Subscript>2</Subscript>O<Subscript>5</Subscript> (M<Superscript>I</Superscript> = Li,Na, K,Cs)

Ferrites of composition ErM^IFe₂O₅ (M^I = Li, Na, K, Cs) were synthesized by a solid-phase method. The structure of the ferrites was for the first time studied by X-ray powder diffraction. Crystal systems, unit cell parameters, and X-ray and pycnometric densities were determined. For ErLiFe₂O₅, a = 10.510 Å, c = 14.270 Å, V°= 1616.16 ų, Z = 16, V _subcell ^° = 101.01 ų, ρ_x = 6.01 g/cm³, ρ_pyc = 5.97 ± 0.04 g/cm³; for ErNaFe₂O₅, a = 10.519 Å, c = 15.510 Å, V° = 1759.56 ų, Z = 16, V _subcell ^° = 109.90 ų, ρ_x = 5.77 g/cm³, ρ_pyc = 5.72 ± 0.08 g/cm³; for ErKFe₂O₅, a = 11.050 Å, c = 15.480 Å, V° = 1937.33 ų, Z = 16, V _subcell ^° = 121.08 ų, ρ_x = 5.46 g/cm³, ρ_pyc = 5.41 ± 0.04 g/cm³; and for ErCsFe₂O₅, a = 10.78 Å, c = 16.01 Å, V° = 1905.37 ų, Z = 16, V _subcell ^° = 119.09 ų, ρ_x = 6.86 g/cm³, ρ_pyc = 6.61 ± 0.01 g/cm³.     

X-ray powder diffraction study of nanostructured particles of manganite ferrites NdMIMnFeO5 (MI = Li, Na, K)

Manganite ferrites NdM^IMnFeO₅ (M^I = Li, Na, K) were synthesized from neodymium(III), manganese(III), and iron(III) oxides and lithium, sodium, and potassium carbonates by a ceramic technology. By grinding the obtained compounds in a ball mill, their nanostructured particles were produced, the sizes of which were determined with an electron microscope. X-ray powder diffraction study and indexing established that the nanostructured compounds NdM^IMnFeO₅ (M^I = Li, Na, K) crystallize in the cubic system with the following lattice parameters: NdLiMnFeO₅: a = 20.100 ± 0.034 Å, V ⁰ = 8120.60 ų, Z = 10, V _un.cell ⁰ = 812.06 ų, ρ_X-ray = 7.14 g/cm³, and ρ_pycn = 7.09 ± 0.06 g/cm³; NdNaMnFeO₅: a = 20.102 ± 0.032 Å, V ⁰ = 8123.03 ų, Z = 10, V _un.cell ⁰ = 812.30 ų, ρ_X-ray = 7.11 g/cm³, and ρ_pycn = 7.04 ± 0.06 g/cm³; and NdKMnFeO₅: a = 20.107 ± 0.011 Å, V ⁰ = 8129.09 ų, Z = 10, V _un.cell ⁰ = 812.91 ų, ρ_X-ray = 7.03 g/cm³, and ρ_pycn = 6.95 ± 0.07 g/cm³.     

X-ray diffraction characteristics of new chromitomanganites LaM 3 I CrMnO6 and LaM 3 II CrMnO7.5 (MI = Li, Na; MII = Mg, Ca)

LaM ₃ ^I CrMnO₆ (M^I = Li, Na) and LaM ₃ ^II CrMnO_7.5 (M^II = Mg, Ca) chromitomanganites were synthesized by ceramic technology from lanthanum oxide, chromium(III) oxide, manganese(III) oxide, lithium carbonate, sodium carbonate, magnesium carbonate, and calcium carbonate. X-ray powder diffraction shows that these compounds crystallize in cubic or tetragonal systems with the following unit cell parameters: for LaLi₃CrMnO₆ (cubic): a = 10.98 Å, V ^○ = 1323.75 ų, Z = 8, V _u.c ^○ = 165.47ų, ρ_X = 3.64, ρ_pycn= 3.60 ± 0.04 g/cm³; for LaNa₃CrMnO₆ (tetragonal): a = 10.96 Å, c = 15.73 Å, V ^○ = 1889.51 ų, Z = 16, V _u.c ^○ = 118.09 ų, ρ_X = 5.77 g/cm³, ρ_pycn = 5.70 ± 0.07 g/cm³; LaMg₃CrMnO_7.5 (cubic), a = 10.98 Å, V ^○ = 1322.31 ų, Z = 8, V _u.c ^○ = 165.29 ų, ρ_X = 4.41 g/cm³, ρ_pycn = 4.35 ± 0.07 g/cm³; and for LaCa₃CrMnO_7.5 (cubic): a = 10.97 Å, V ^○ = 1319.78 ų, Z = 8, V _u.c ^pO = 164.97 ų, ρ_X = 4.89 g/cm³, ρ_pycn = 4.85 ± 0.05 g/cm³.     

New manganites NdM3Sr3Mn4O12 and NdM3Ba3Mn4O12 (M = Li, Na, K): Synthesis and X-ray diffraction characteristics

Manganites NdM₃Sr₃Mn₄O₁₂ and NdM₃Ba₃Mn₄O₁₂ (M = Li, Na, K) were synthesized by a ceramic method from the corresponding oxides and carbonates. The X-ray diffraction analysis showed that all the compounds crystallized in the tetragonal crystal system with the following lattice parameters: NdLi₃Sr₃Mn₄O₁₂: a = 10.88 ?, c = 9.52 ?, V ^o = 1126.9 ?³, Z = 4, ρ_X = 4.95 g/cm³, ρ_pycn = 4.87 ± 0.05 g/cm³; NdNa₃Sr₃Mn₄O₁₂: a = 10.73 ?, c = 10.66 ?, V ^o = 1227.3 ?³, Z = 4, ρ_X = 4.80 g/cm³, ρ_pycn = 4.73 ± 0.07 g/cm³; NdK₃Sr₃Mn₄O₁₂: a = 10.87 ?, c = 11.71 ?, V ^o = 1382.6 ?³, Z = 4, ρ_X = 4.50 g/cm³, ρ_pycn = 4.43 ± 0.09 g/cm³; NdLi₃Ba₃Mn₄O₁₂: a = 10.97 ?, c = 10.34 ?, V ^o = 1244.3 ?³, Z = 4, ρ_X = 5.33 g/cm³, ρ_pycn = 5.23 ± 0.09 g/cm³; NdNa₃Ba₃Mn₄O₁₂: a = 10.99 ?, c = 11.15 ?, V ^o = 1346.7 ?³, Z = 4; ρ_X = 5.11 g/cm³, ρ_pycn = 5.05 ± 0.06 g/cm³; NdK₃Ba₃Mn₄O₁₂: a = 10.997 ?; c = 13.80 ?, V ^o = 1668.9 ?³, Z = 4, ρ_X = 4.32 g/cm³, ρ_pycn = 4.26 ± 0.07 g/cm³. Original Russian Text ? B.K. Kasenov, E.S. Mustafin, M.A. Akubaeva, S.T. Edil’baeva, Sh.B. Kasenova, Zh.I. Sagintaeva, S.Zh. Davrenbekov, 2009, published in Zhurnal Neorganicheskoi Khimii, 2009, Vol. 54, No. 3, pp. 424–427.     

Synthesis and X-ray diffraction and calorimetric studies of LaLiMnFeO5 and LaCsMnFeO5 ferrites

Ferrites LaLiMnFeO₅ and LaCsMnFeO₅ were synthesized for the first time by ceramic technology from mixtures of lanthanum(III), manganese, and iron(III) oxides with lithium or cesium carbonate. The compounds were shown by X-ray diffraction to crystallize in the orthorhombic system; the unit cell parameters were determined. The heat capacities were found experimentally for 298.15–673 K. Equations for the heat capacities as a function of temperature were derived and used to calculate the thermodynamic functions C _p ⁰ (T), S ⁰(T), H ⁰(T)?H ⁰(298.15), and Φ**(T) for the above temperature range.     

Ferrites YbSrFe2O5.5 and YbBaFe2O5.5: Synthesis and X-ray diffraction, thermodynamic, and electrophysical properties

Ferrites YbSrFe₂O_5.5 and YbBaFe₂O_5.5 are prepared by reacting ytterbium(III) oxide and iron(III) oxide with strontium or barium carbonate in the solid phase. The ferrites crystallize in the orthorhombic system as shown by indexing of their X-ray diffraction patterns with homology modeling: for YbSrFe₂O_5.5, a = 10.74 ± 0.006 Å, b = 10.93 ± 0.006 Å, c = 16.64 ± 0.046 Å, V ⁰ = 1953.3 ų, Z = 16, V _subcell ⁰ = 122.08 ų, ρ_X-ray = 6.26 g/cm³, ρ_pycn = 6.18 ± 0.9 g/cm³; for YbaBaFe₂O_5.5, a = 10.74 ± 0.013 Å, b = 10.99 ± 0.004 Å, c = 17.16 ± 0.017 Å, V ⁰ = 2025.4 ų, Z = 16, V _subcell ⁰ = 126.59 ų, ρ_X-ray = 6.69 g/cm³, ρ_pycn = 6.40 ± 0.32 g/cm³. The calorimetric heat capacities of the ferrites are studied from 298.15 to 673 K. The C _p ^o ～ f(T) curves show λ peaks at 448 K for YbSrFe₂O_5.5 and at 373 K for YbBaFe₂O_5.5, likely, due to second-order phase transitions. The dielectric constants and electrical resistances of the ferrites are studied as functions of temperature from 293 to 493 K.     

Thermal decomposition of β-cyclodextrin and its inclusion complex with vitamin E

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