[en] The possibility has been established of the formation of double uranyl sulphates with the composition MUO₂(SO₄)₂x5H₂O (M=Mn or Co). These compounds are formed upon dissolution of MnSO₄x5H₂O or CoSO₄x7H₂O and UO₂SO₄x2.5H₂O in a minimum amount of water with subsequent evaporation to dryness. The obtained monocrystals have been studied by X-ray structural analysis and the parameters of monoclinic elementary cells have been determined: MnUO₂(SO₄)₂x5H₂O (a=6.524; b=11.396; c=8.362 A; β=90 deg 47') and CoUO₂(SO₄)₂x5H₂O (a=6.448; b=11.305; c=8.286 A; β=90 deg). Possible spatial groups are P 2sub(1/m) or P2₁; Z=2. Thermographic study of the obtained compounds has been performed

[en] Complexation in the UO₂SeO₄-(CH₃)₂NCONH₂-H₂O system is studied by isothermal solubility at 25 degrees C. Congruently soluble UO₂SeO₄·2(CH₃)₂NCONH₂·2H₂O (I) is detected. The unit-cell constants of I found by a single-crystal X-ray diffraction study are a = 14.251, b = 13.896, c = 17.789 angstrom, β = 104.74 degrees, Z = 8, and space group P2₁/c. Compound I is a representative of the AT³M₂¹ crystal-chemical group of uranyl complexes

[en] Using the method of isothermal solubility at 25 deg C the interaction of cesium and uranyl selenates in aqueous solution is studied. Formation of congruently soluble Cs₂UO₂(SeO₄)₂x2H₂O and Cs₂(UO₂)₂x(SeO₄)₃ is ascertained, their crystallographic characteristics being determined

[en] Isothermic evaporation of an aqueous solution containing equimolar amounts of Be and UO₂ sulphates results in BeUO₂(SO₄)₂x8H₂O (1). X-ray structural analysis has indicated that single crystals (1) belong to rhombic syngony with the unit cell parameters a=7.332, b=11.53, c=18.90 A, z=4, spatial group Psub(mnb) or P2sub(1sub(nb)). Thermal decomposition of (1) was studied and its structure is suggested

[en] Complexation in the system K₂SeO₄-UO₂SeO₄-H₂O at 25 degrees C is studied by isothermal solubility. Congruently soluble K₂UO₂(SeO₄)₂·4H₂O (I) and incongruently soluble K₂(UO₂)₂(SeO₄)₃·6H₂O (II) are observed. The unit-cell constants of I and II are determined from an X-ray diffraction investigation. For I, a = 12,969, b = 11.588, c = 8.533 angstrom, Z = 4, space group Pmmb. For II, a = 23.36, b = 6.784, c = 13.699 angstrom, β = 104.42 degrees, Z = 4, space group P2/m, P2, or Pm. Complexes I and II are representatives of the crystal-chemical groups AB²₂M¹ and A₂T³₃M¹, respectively, of uranyl complexes

[en] Synthesis and thermographic and x-ray study of hydroxochromatouranylates Ca₂(UO₂)₃(CrO₄)₅ . 19H₂O, Ca₂(UO₂)₄)CrO₄)₃(OH)₆ . 13H₂O, an CaO . 6UO₃ . 12H₂O were carried out

[en] Rubidium difluorosulfatouranylate monohydrate is prepared by crystallization of aqueous solutions containing rubidium fluoride and uranyl sulfate at a mole ratio of 2:1 and temperature of 20-25 deg C. X-ray and IR spectroscopic investigations of the synthesized complex are conducted. This complex is isostructural to the K₂[UO₂epslonO₄F₂]xH₂O (epsilon=S, Se or Cr) compounds studied earlier. Crystallographic characteristics of the complex are presented. A conclusion on crystal and molecular structure of the compound is drawn. It is noted that complete difluorosulfatouranylate dehydration proceeds in one stage at 490-530 K and is accompanied by an endothermic effect

[en] This paper presents results of x-ray diffraction and an IR spectroscopic study of rubidium difluorosulfatouranylate monohydrate. The isostructurality with previously studied K₂(UO₂ EO₄F₂) X H₂O was established. Crystallographic properties are presented

[en] Synthesis and thermographic investigation of (NH₄)₂(UO₂)₂(CrO₄)₃x5H₂O and R₂(UO₂)₂(CrO₄)₃x6H₂O (R=K,Rb) trichromatodiuranylate hydrates are carried out. Crystallographic characteristics of compounds are given and suppositions about their structure are formed. The ammonium complex is crystallized in triclinic syngony with the parameters of an elementary cell: a=1.0241, b=0.8188, c=1.1003 nm; α=88.42, β=107.22, γ=95.24 deg; sp. gr. P1, P1-bar; d_calcd=3-84, d_obsd=3.74 g/cm³. The parameters of the monoclinic cell of potassium and rubidium complexes equal correspondingly: a=1.0682 and 1.0787; b=1-4451 and 1.4750; c=1.4063 and 1.4161; β=108.01 and 108.28 deg; sp.gr. P2₁/c; d_calcd=3.46 and 3.62, d_obsd=3-47 and 3.55 g/cm³

[en] UO₂XO₄·2 (X = S, Se or Cr; L = N,N-dimethyl acetamide) are produced by the method of isothermal evaporation, and their X-ray diffraction and thermodiffraction investigations are carried out. The belonging of the synthesized compounds to the crystallochemical group of AT¹¹M₂¹ complexes of uranyl is established, and peculiarities of their crystal structure are discussed. 3 refs.; 1 fig.; 2 tabs