A. S. Kanishcheva

Insertion of Ethyl Isocyanate at the Tungsten–Chlorine Bond. Crystal Structure of 1,3,5-Triethyl-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione

The reaction of tungsten hexachloride with excess ethyl isocyanate in dichloroethane leads to the insertion of three ligand molecules at one of the tungsten–chlorine bonds. The data of elemental analysis and IR spectroscopy confirm that the thermolysis of the reaction mixture affords the WCl4(L3Cl) complex (I), where L = –N(Et)C(O)–. The structure of the chain of inserted molecules in I is established on the basis of IR and NMR data, and the results of X-ray diffraction analysis of crystals of an organic product (II) of the hydrolysis of I. According to the latter, compound (II) is a derivative of s-triazine—1,3,5-triethyl-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione.

Synthesis and crystal structure of phosphate Ba1.5Fe2(PO4)3

Double phosphate Ba1.5Fe2(PO4)3 was synthesized and structurally studied. Single crystals were synthesized by the fusion method. Cubic crystals, Z = 4, space group P213, a = 9.866(1) Å. This structure is built of polyhedrons of four types: PO4 tetrahedrons, two virtually regular FeO6 octahedrons, BaO12 twelve-vertex polyhedrons, and BaO9 nine-vertex polyhedrons. These polyhedrons share common oxygen vertices to form three-dimensional [Fe2(PO4)3]3∞ framework containing barium atoms in cavities.

Uranyl aquahydroxylaminate complexes

Uranylaqua complexes with N-methyl-, N-ethyl-, N-isopropyl-, and N,N-dimethylhydroxylamines were studied. The structure of [UO2{(CH3)2NO}2(H2O)2] was determined by X-ray crystallography. The N, N -dimethylhydroxylaminate ion is coordinated to uranyl through the nitrogen and oxygen atoms with the formation of a three-membered chelate ring.

Conformational rearrangement of 18-crown-6 upon the formation of aquanitratouranyl complexes: The refinement of crystal and molecular structures for [UO2(NO3)2(H2O)2] · 2H2O · 18C6

Comparing the geometry of [UO2(NO3)2(H2O)2] · 2H2O · 18C6 (18C6 = C12H24O6) and IR spectroscopic data, we propose correlations between the conformation of an ethylene oxide unit of 18-crown-6 and the conformation-sensitive frequency in the IR spectrum. Spectral conformational analysis verifies the composition of the 18-crown-6 conformer in the [UO2(NO3)2(H2O)2] · 18C6 complex whose structure is known. The distribution character of hydrogen bonds that retain crown ether molecules in aquanitratouranyl complexes is shown to influence the conformational uniformity of ethylene oxide units of the macrocycle.

Synthesis, thermal analysis, IR spectrum, and crystal structure of rubidium hexanitratothorate

Rubidium hexanitratothorate was synthesized, and its crystal structure was determined by X-ray diffraction analysis: space group P21/n; a = 8.347(1) Å, b = 6.890(1) Å, c = 13.069(1) Å, β = 91.88(1)°, Z = 2; 1812 independent reflections, R = 0.0165.

Crystal and molecular structure of ammonium trinitratouranylate NH4[UO2(NO3)3]

Ammonium trinitratouranylate NH4[UO2(NO3)3] (I) single crystals have been synthesized by the reaction of aqueous solutions of diaquadinitratouranyl tetrahydrate and ammonium nitrate in the presence of nitric acid. The structure of the complex has been studied by X-ray diffraction analysis: space group

Uranyl complexes with methyl derivatives of alicyclic dioximes

R\bar 3c

Bismuth aluminoborate Bi0.96Al2.37(B4O10)O: Synthesis and crystal structure

, a = 9.361(2), c = 18.883(4) Å; V = 1433.0(5) Å3, and Z = 6. The structural units of the NH4[UO2(NO3)3] crystal—NH4+ cations and [UO2(NO3)3]− complex anions with three bidentate cyclic nitrato groups—are on crystallographic axes