Synthesis and X-ray diffraction study of LaM 1.5 II MnFeO6 manganitoferrites (MII = Mg,Ca, Sr,Ba)

LaM _1.5 ^II MnFeO₆ manganitoferrites (M^II = Mg, Ca, Sr, Ba) have been synthesized by ceramic technology from lanthanum oxide, manganese(III) oxide, iron(III) oxide, and alkali-earth carbonates. X-ray powder diffraction shows that these compounds crystallize in cubic crystal system with the following unit cell parameters: for LaMg_1.5MnFeO₆: a = 20.232 ± 0.032 Å, V ⁰ = 8281.642 ± 0.096 ų, Z = 10, ρ_X = 7.38 g/cm³, ρ_pycn = 7.29 ± 0.06 g/cm³; for LaCa_1.5MnFeO₆: a = 20.056 ± 0.017 Å, V ₀ = 8067.388 ± 0.051 ų, Z = 8, ρ_X = 5.89 g/cm³, ρ_pycn = 5.78 ± 0.06 g/cm³; for LaSr_1.5MnFeO₆: a = 20.117 ± 0.021 Å, V ₀ = 8141.223 ± 0.063 ų, Z = 8, V _u.c. ⁰ = 1017.653 ± 0.008 ų, ρ_X = 6.64 g/cm³, ρ_pycn = 6.56 Å 0.08 g/cm³; for LaBa_1.5MnFeO₆: a = 20.361 ± 0.025 Å, V ₀ = 8441.066 ± 0.075 ų, Z = 8, ρ_X = 7.31 g/cm³, ρ_pycn = 7.25 ± 0.07 g/cm³.     

Synthesis and x-ray diffraction study of new nanostructured manganite ferrites NdM 1.5 II MnFeO6 (MII = Mg, Ca, Sr, Ba)

Manganite ferrites NdM _1.5 ^II MnFeO₆ (M^II = Mg, Ca, Sr, Ba) were synthesized from neodymium(III), manganese(III), and iron(III) oxides and alkaline-earth metal 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 diffraction study established that the nanostructured compounds crystallize in the cubic and tetragonal systems with the following lattice parameters: NdMg_1.5MnFeO₆ (tetragonal): a = 10.955 Å, c = 17.848 Å, V ⁰ = 2141.975 ų, Z = 16, V _e1.cel1 ⁰ = 133.873 ų, ρ_X-ray = 4.80 g/cm³, and ρ_pycn = 4.76 ± 0.05 g/cm³; NdCa_1.5MnFeO₆ (cubic): a= 10.809 Å, V ⁰ = 1262.864 ų, Z = 8, V _e1.cel1 ⁰ = 157.858 ų, ρ_X-ray = 4.32 g/cm³, and ρ_pycn = 4.27 ± 0.03 g/cm³; NdSr_1.5MnFeO₆ (cubic): a = 10.911 Å, V ⁰ = 1298.953 ų, Z = 8, V _e1.cel1 ⁰ = 162.369 ų, ρ_X-ray = 4.93 g/cm³, and ρ_pycn= 4.88 ± 0.05 g/cm³; and NdBa_1.5MnFeO₆ (tetragonal): a = 11.011 Å, c = 18.001 Å, V ₀ = 2182.479 ų, Z = 16, V _e1.cel1 ⁰ = 136.405 ų, ρ_X-ray = 6.78 g/cm³, and ρ_pycn= 6.75 ± 0.07 g/cm³.     

Synthesis and X-ray diffraction study of nanostructured particles of cuprate manganites LaM 2 II CuMnO6 (MII = Mg,Ca, Sr,Ba)

Cuprate manganites of the composition LaM ₂ ^II CuMnO₆ (M^II = Mg, Ca, Sr, Ba) were synthesized from lanthanum, copper(II), and manganese(III) oxides and alkaline-earth metal carbonates by high-temperature solid-phase synthesis. By grinding the produced substances in a ball mill, their nanostructured particles were obtained, the sizes of which were determined with an electron microscope. Indexing the X-ray powder diffraction patterns of the cuprate manganites established that all of them crystallize in the cubic system with the following unit cell parameters: LaMg₂CuMnO₆: a = 15.523 ± 0.033 Å, Z = 6, V ⁰ = 3740.48 ± 0.10 ų, V _el.cell ⁰ = 623.41 ± 0.03ų, ρ_X-ray = 5.81 g/cm³, and ρ_pycn = 5.75 ± 0.06 g/cm³; LaCa₂CuMnO₆: a = 15.422 ± 0.058 Å, Z = 4, V ⁰ = 3667.94 ± 0.174 ų, V _el.cell ⁰ = 916.48 ± 0.04 ų, ρ_X-ray = 3.77 g/cm³, and ρ_pycn = 3.72 ± 0.05 g/cm³; LaSr₂CuMnO₆: a = 15.275 ± 0.049 Å, Z = 4, V ⁰ = 3564.05 ± 0.27 ų, V _el.cell ⁰ = 891.01 ± 0.07 ų, ρ_X-ray = 4.31 g/cm³, and ρ_pycn = 4.25 ± 0.05 g/cm³; and LaBa₂CuMnO₆: a = 15.589 ± 0.029 Å, Z = 4, V ⁰ = 3788.39 ± 0.09 ų, V _el.cell ⁰ = 947.10 ± 0.02 ų, ρ_X-ray = 4.74 g/cm³, and ρ_pycn = 4.70 ± 0.05 g/cm³. The data of an IR spectroscopic study of the cuprate manganites were presented.     

Synthesis and X-ray diffraction study of ternary ferrites LaNaMnFeO5 and LaKMnFeO5

Ferrites LaNaMnFeO₅ and LaKMnFeO₅ have been synthesized by the ceramic method from lanthanum(III) and iron(III) oxides and sodium and potassium carbonates. The ferrites crystallize in the orthorhombic crystal system with the following lattice parameters: LaNaMnFeO₅: a = 10.943 ± 0.002 Å, b = 11.022 ± 0.001 Å, c = 16.165 ± 0.028 Å, V ⁰ = 1949.72 ų, Z = 16, V _{unit cell} ⁰ = 12.1.85 ų, ρ_X = 4.83, ρ_pycn = 4.76 ± 0.09 g/cm³; LaKMnFeO₅: a = 10.959 ± 0.011 Å, b = 11.036 ± 0.005 Å, c = 17.825 ± 0.074 Å, V ⁰ = 2155.81 ų, Z = 16, V _{unit cell} ⁰ = 134.74 ų, ρ_X = 4.54, ρ_pycn = 4.46 ± 0.07 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 data for new ferrites ErMFe<Subscript>2</Subscript>O<Subscript>5</Subscript> (M = Li,Na, K)

New ferrites ErMFe₂O₅ (M = Li, Na, K) were synthesized from erbium and iron(III) oxides and lithium, sodium, and potassium carbonates by solid-state annealing. According to X-ray powder diffraction, these compounds crystallize in the orthorhombic system with the following unit cell parameters: ErLiFe₂O₅, a = 10.510 Å, b = 10.776 Å, c = 14.270 Å, V ⁰ = 1616.16 ų; Z = 16, V _subcell ⁰ = 101.01 ų, ρ_X = 6.01 g/cm³, ρ_pycn = 5.97 ± 0.05 g/cm³; ErNaFe₂O₅, a = 10.519 Å, b = 10.785 Å, c = 15.510 Å, V ⁰ = 1759.56 ų, Z = 16, V _subcell ⁰ = 109.90 ų, ρ_X = 5.77 g/cm³, ρ_pycn = 5.72 ± 0.08 g/cm³; ErKFe₂O₅, a = 10.050 Å, b = 11.320 Å, c = 15.480 Å, V ⁰ = 1937.33 ų, Z = 16, V _subcell ⁰ = 121.08 ų, ρ_X = 5.46 g/cm³, ρ_pycn = 5.41 ± 0.04 g/cm³.     

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.     

Chromites YbMCr<Subscript>2</Subscript>O<Subscript>5</Subscript> (M = Li,Na, K,Cs): X-ray diffraction study

Ytterbium alkali-metal chromites YbMCr₂O₅ (M = Li, Na, K, Cs) were synthesized by a ceramic procedure from the corresponding oxides and carbonates. Their crystal systems and unit cell parameters were determined by the homology method: for YbLiCr₂O₅, a = 10.34 Å, b = 10.62 Å, c = 15.05 Å, Z = 16, V ^o = 1653.74 ų, ρ_X-ray = 5.85 g/cm³, ρ_pycn = 5.81 ± 0.03 g/cm³; for YbNaCr₂O₅, a = 10.30 Å, b = 10.56 Å, c = 16.46 Å, Z = 16, V ^o = 1790.32 ų, ρ_X-ray = 5.64 g/cm³, ρ_pycn = 5.59 ± 0.07 g/cm³; for YbKCr₂O₅, a = 10.33 Å, b = 10.63 Å, c = 19.93 Å, Z = 16, V ^o = 2188.47 ų, ρ_X-ray = 5.95 g/cm³, ρ_pycn = 5.91 ± 0.03 g/cm³; and for YbCsCr₂O₅, a = 10.34 Å, b = 10.63 Å, c = 18.43 Å, Z = 16, V ^o = 2025.72 ų, ρ_X-ray = 5.19 g/cm³, ρ_pycn = 5.16 ± 0.05 g/cm³.     

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.     

Coordination polymers of silver with piperazine and uncoordinated anions: Syntheses and crystal structures of [Ag(C4H10N2)]CH3SO3 and [Ag(C4H10N2)]PO2F2

The coordination polymers [Ag(C₄H₁₀N₂)]CH₃SO₃ (I) and [Ag(C₄H₁₀N₂)]PO₂F₂ (II) (C₄H₁₀N₂ is piperazine (Ppz)) are synthesized, and their structures are determined. The crystals of I are monoclinic, space group P2₁/c, a = 6.280(1) Å, b = 11.781(1) Å, c = 12.112(1) Å, β = 97.21(1)°, V = 889.0(2) ų, ρ_calcd = 2.160 g/cm³, and Z = 4. The crystals of II are orthorhombic, space group Cmca, a = 13.039(1) Å, b = 10.450(1) Å, c = 12.837(1) Å, V = 1749.1(3) ų, ρ_calcd = 2.240 g/cm³, and Z = 8. Structure I contains cationic polymer chains [Ag(Ppz)] _∞ ⁺ . The silver atom bound to two nitrogen atoms of two Ppz ligands has an almost linear coordination mode (Ag-N_average 2.197 Å, angle NAgN 161.2(1)°). The structure includes supramolecular layers due to weak interactions Ag…O(CH₃SO₃). Structure II is built of zigzag polymer chains [Ag(Ppz)]⁺ and tetrahedral cations PO₂F ₂ ^? . The Ag⁺ ion has a linear coordination mode (Ag-N 2.220(3) Å, and the NAgN angle is 164.3(2)°). The tetrahedral anions PO₂F ₂ ^? having weak contacts with the silver ions (Ag…O 2.630(3)Å) join the [Ag(Ppz)] _∞ ⁺ chains into wavy layers.     

Study of new molecular and crystal structures of 4,4,10,10-tetramethyl-1,3,7,9-tetraazospiro[5.5]undecane-2,8-dione and its salts: Monochloride,mononitrate, and tetraiodotellurate

This is the first work to synthesize 4,4,10,10-tetramethyl-1,3,7,9-tetraazospiro[5.5]undecane-2,8-dione monohydrate, monochloride, mononitrate, and teteraiodotellurate: C₁₁H₂₀N₄O₂·H₂O (I), C₁₁H₂₁N₄O ₂ ⁺ ·Cl^? (II), C₁₁H₂₁N₄O ₂ ⁺ ·NO ₃ ^? (III), and 2(C₁₁H₂₁N₄O ₂ ⁺ )·TeI ₄ ^2? ·C₃H₆O (IV) and determine their structures. Crystals of I are monoclinic: space group P2₁/c, at 298 K a = 5.7118(7) Å, b = 17.842(2) Å, and c = 13.5905(16) Å; β = 91.621(11)°; V = 1384.5(3) ų; d _x = 1.239 g/cm³, Z = 4. Crystals of II are tetragonal: space group P4₃, at 298 K a = 6.4134(3) Å and c = 34.292(2) Å; V = 1410.47(14) ų; d _x = 1.303 g/cm³; Z = 4. Crystals of III are triclinic: space group \(P\bar 1\) , at 298 K a = 8.7614(14) Å, b = 9.3904(18) Å, and c = 10.028(2) Å; α = 63.27(2)°, β = 78.591(16)°, and γ = 84.308(15)°; V = 722.3(2) ų; d _x = 1.40 g/cm³; Z = 2. Crystals of IV are triclinic: space group \(P\bar 1\) , at 100 K a = 10.4630(4) Å, b = 11.9372(6) Å, and c = 16.4118(5) Å; α = 72.058(3)°, β = 76.406(3)°, and γ = 87.029(3)°; V = 1895.04(12) ų; d _x = 2.06 g/cm³; Z = 2. The synthesis of s and p metals with spirocarbone in acetone medium is found to be impossible due to the protonation by the oxygen atom of the carbonyl group. The main crystalline product of the complexation reaction is a monosalt. Evidence is provided that the recrystallization and drying of the synthesized spirocarbone preparation yields monohydrate (I); its purity and monophasity is confirmed by a Rietveld refinement of the powder X-ray pattern. The lattice parameters at room temperature are: a = 5.6885(12) Å, b = 17.8496(12) Å, and c = 13.518(3) Å; β = 91.449(15)°; V = 1372.1(4) ų. The sample is monophasic.     

Synthesis and crystal structure of the coordination polymer of silver with 4,4′-bipyridylethylene [Ag(Bpe)](NO3)·3H2O

The compound [Ag(Bpe)](NO₃)·3H₂O (Bpe = 4,4′-bipyridylethylene, C₁₂H₁₀N₂) is prepared and its crystal structure is determined. The crystals are triclinic: a = 9.073(2) Å, b = 10.074(2) Å, c = 10.391(2) Å, α = 61.18(3)°, β = 72.11(3)°, γ = 68.62(3)°, space group P $\bar 1$ , V = 764.7(3) ų, ρ(calcd) = 1.764 g/cm³, Z = 2. The structure is composed of polymeric cationic chains, [Ag(Bpe)] _∞ ⁺ , NO ₃ ^? counterions, and water molecules. The Ag⁺ ions are bound to the two N atoms of two crystallographically nonequivalent Bpe ligands and form a nearly linear coordination (Ag(1)-N(1), 2.129 Å; Ag(1)-N(2), 2.120(4) Å; N(1)Ag(1)N(2), 169.9(2)°).     

Synthesis, crystal structure, and luminescent properties of a silver(I) perrhenate complex with phenazine

The silver complex with phenazine [Ag(Phz)₂(H₂O)]ReO₄ (Phz is C₁₂H₈N₂) has been synthesized, and its crystal structure has been determined. The crystals are triclinic: space group $P\bar 1$ , a = 9.587(1) Å, b = 10.875(1) Å, c = 11.668(1) Å, α = 104.98(1)°, β = 103.87(1)°, γ = 92.94(1)°, V = 1132.6(2) ų, Z = 2, ρ_calc = 2.160 g/cm³. The structure is composed of the [Ag(Phz)₂(H₂O)]⁺ silver cationic complexes and ReO ₄ ^? anions. The Ag⁺ ion is coordinated by two nitrogen atoms of independent phenazine molecules and the water oxygen atoms and has a T-shaped coordination (Ag-N_av 2.223 Å, Ag-O_w 2.498(8) Å). Phenazine, being an electron-donor ligand, forms columns due to π-π stacking interaction between the aromatic groups. The water molecules form hydrogen bonds with the oxygen atoms of water molecules of neighboring complexes and with oxygen atoms of the ReO ₄ ^? anions.     

Synthesis and crystal structure of lanthanum(III) Iodomercurate(II) complexes with ɛ-Caprolactam

The X-ray diffraction study of the crystalline products of the reaction between potassium tetraiodomercurate(II), ?-caprolactam, and lanthanum(III) nitrate at a ratio of 3: 16: 2 in an aqueous solution has shown the presence of the following three new crystalline compounds: [LaCpl₈]₂[HgI₄]₃ (I), [LaCpl₈][HgI₄]I₃ (II), and [LaCpl₇(H₂O)]₂[HgI₄]₂[Hg₂I₆] (III), where Cpl is ?-caprolactam ?-C₆H₁₁NO. Compounds I and II crystallize in tetragonal crystal system, space groups P4₂/n and $I\bar 4$ , respectively. For compound I, a = 18.59320(10) Å, c = 19.5782(3) Å, V = 6738.32(12) ų, Z = 2, and ρ_calc = 2.067 g/cm³. For compound II, a = 13.2245(10) Å, c = 20.0310(3) Å, V = 3503.17(6) ų, Z = 2, ρ_calc = 2.022 g/cm³. The crystals of compound III are monoclinic (space group P _{2 1}/n, a = 20.1202(6) Å, b = 14.0569(4) Å, c = 46.3228(12) Å, β = 93.4770(10)°, V = 13077.3(6) ų, Z = 4, ρ_calc = 2.274 g/cm³). [La(Cpl)₈]₂[Hg₂I₆]₃ (IV), a new double ionic complex salt, has also been synthesized and studied by X-ray diffraction. The crystals of compound IV are triclinic (space group $P\bar 1$ , a = 12.5021(3) Å, b = 14.6436(3) Å, c = 21.4695(4) Å, α = 84.2300(10)°, β = 87.2230(10)°, γ = 74.9970(10)°, V = 3776.30(14) ų, Z = 1, ρ_calc = 2.452 g/cm³). All complexes have a dicrete ionic structure, and the nearest surrounding of a La atom is distorted square-prismatic or trigonal-dodecahedral. The crystal packing of cations is distorted face-centered cubic (I and II) or body-centered cubic (III and IV) with anions located in its cavities.     

Hexaaquachromium(III) trihydrogen isopolyvanadate [Cr(H2O)6]H3[V10O28] · 2H2O: Synthesis and study

Hexaaquachromium(III) trihydrogen isopolyvanadate [Cr(H₂O)₆]H₃[V₁₀O₂₈] · 2H₂O (I) was obtained and examined by mass spectrometry, X-ray powder diffraction, thermogravimetry, and IR and NMR spectroscopy. The crystals are monoclinic, space group $P\bar 1$ a = 7.862(3), b = 8.427(5), c = 5.000(2) Å, β = 96.46(4)°, V = 867.0(3) ų, ρ_calcd = 5.83 g/cm³, Z = 1.     

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.     

A novel three-dimensional cobalt(II)-radical complex Co(NITmPy)2[N(CN)2]2: Structure and magnetic properties

A novel three-dimensional cobalt(II)-radical complex {Co(NITmPy)₂[N(CN)₂]₂}_n (NITmPy = 2-(3′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) is prepared and characterized by X-ray crystallography. The complex crystallizes in the monoclinic system, space group P2₁/c, with unit cell parameters a = 12.5775(5) Å, b = 10.9340(5) Å, c = 11.6134(5) Å, β = 108.1320(10)°; V = 1517.79(11) ų, ρ_calcd = 1.443 g/cm³, and Z = 2 for R ₁ = 0.0463. In the complex, each cobalt ion is six-coordinate with four nitrogen atoms from four N(CN) ₂ ^t- ligands and two nitrogen atoms of pyridyl groups, and the [Co(NITmPy)₂]²⁺ units are linked by N(CN) ₂ ^t- μ-bridging ligands to form a three-dimensional structure. The variable-temperature magnetic susceptibility data show that the complex exhibits weak antiferromagnetic interactions.     

Crystal structure of (C2H7N4O)2[(UO2)2)(OH)2(C2O4)(CHO2)2]

An X-ray diffraction study of the single crystals of (C₂H₇N₄O)₂[(UO₂)₂(OH)₂(C₂O₄)(CHO₂)₂] was carried out. The compound crystallizes in the triclinic system, space group $P\bar 1$ , Z = 2, a = 5.5621(8) Å, b = 8.1489(10) Å, c = 11.8757(16) Å, α = 88.866(7)°, β = 82.204(6)°, γ = 87.378(6)°, V = 532.7(1) ų, ρ_calcd = 2.988 g/cm³. The main structural units in the crystal are the [(UO₂)₂(OH)₂(C₂O₄)(CHO₂)₂)]^2? chains corresponding to the crystal chemical group A₂M ₂ ² K⁰²M ₂ ¹ (A = UO ₂ ²⁺ , M² = OH^?, K⁰² = C₂O ₄ ^2? , M¹ = CHO ₂ ^? ) of uranyl complexes. The chains are united into a three-dimensional framework through the electrostatic interaction and hydrogen bonds involving uranyl, oxalate, and hydroxyl groups, formate ions, and 1-carbamoylguanidinium cations.     

Synthesis and physicochemical study of diazabicycloundecene hexamolybdochromate [C9H16N2]H3[CrMo6O18(OH)6] · 2H2O

Quinazoline hexamolybdochromate [C₉H₁₆N₂]H₃[CrMo₆O₁₈(OH)₆] · 2H₂O has been synthesized and studied by mass spectroscopy, X-ray powder diffraction, thermogravimetry, and IR and NMR spectroscopy. The compound crystallizes in triclinic system with the unit cell parameters a = 15.06 Å, b = 13.08 Å, c = 8.17 Å, α = 59.85°, β = 123.15°, γ = 107.01°, V = 1165.62 ų, ρ_pycn = 3.58 g/cm³, and Z = 2.     

Preparation and study of hydrogen hexamolybdometallates(III) with the hexamminecadmium cation

Hydrogen hexamolybdogallate and hexamolybdoaluminate with the hexamminecadmium cation [Cd(NH₃)₆] · H[GaMo₆O₁₈(OH)₆] · 6H₂O (I) and [Cd(NH₃)₆] · H[AlMo₆O₁₈(OH)₆] · 6H₂O (II) were synthesized and studied by mass spectrometry, thermogravimetric analysis, powder X-ray diffraction, and IR spectroscopy. The crystals are monoclinic; I: a = 10.82 Å, b = 3.69 Å, c = 11.99 Å, β = 91.06°, V= 469.72 ų, ρ_calcd = 2.34 g/cm³, Z = 2; II: a = 10.81 Å, b = 3.67 Å, c =11.98 Å, β = 91.08°, V = 469.78 ų, ρ_calcd = 2.38 g/cm³, Z = 2.