Yu. N. Mikhailov

Synthesis and crystal structures of [UO2(C6H4NO2)2(C6H5NO2)] and [UO2SO4(C6H5NO2)(H2O)] · H2O

AbstractThe complexes [UO2(C6H4NO2)2(C6H5NO2) (I) and [UO2SO4(C6H5NO2)(H2O)] · H2O (II) were synthesized and studied by X-ray diffraction analysis. Crystals I are monoclinic: a = 7.0081(3), b = 14.9624(7), c = 9.1837(5) Å, β = 96.594(2)°, Z = 2, space group P21/m. Crystals II are triclinic: a = 6.8097(6), b = 9.3837(8), c = 10.4556(10) Å, α = 85.279(3), β = 75.434(3), γ = 69.180(3)°, Z = 2, space group

Uranyl complexes with acetophenone oxime

P\bar 1

Crystal Structure of Rb[UO2(SO4)F]

. The main structural unit of crystal I is a mononuclear fragment, which belongs to the crystal chemical group AB201M1 (A = UO22+, B01 are ions of pyridine-2-carboxylic (picolinic) acid, M1 are molecules of picolinic acid) of the uranyl complexes. The main structural unit of crystal II is a chain, which belongs to the crystal chemical group AT3M21 (where T3-SO42−, M1 are water and picolinic acid molecules) of the uranyl complexes. Picolinic acid in complexes I, II was found to have a zwitterion structure.

Molybdenum(VI) complexes with N-substituted hydroxylamines

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.

Inner complex compounds of dioxomolybdenum(VI) with o-oxyazomethines, derivatives of substituted salicylaldehydes and tris(hydroxymethyl)aminomethane. crystal structures of two complexes [MoO(L)] · CH3OH; L = Z-substituted salicylalimines, Z = 3-NO2 and 3-OCH3

The interaction of uranyl compounds with acetophenone oxime has been studied. Mixed-ligand uranyl acetophenone oximates have been synthesized. X-ray crystallography shows that, in single crystals of [UO2(C8H8NO)2{(CH3)2SO}2] and [UO2(C8H8NO)(NO3){(CH3)2SO}2], acetophenone oxime is coordinated to uranyl as a bidentate chelating ligand.

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

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.

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

Single crystal of Rb[UO2(SO4)F] (I) was studied by X-ray diffraction [rhombic system, space group Pca21, Z = 12, unit cell parameters: a = 25.393(3), b = 6.735(1), c = 11.496(3) Å]. The main structural units of crystals of I are [UO2(SO4)F]- layers belonging to the crystallochemical group AT3M2 (A = UO22+) of uranyl complexes and combined into three-dimensional framework by electrostatic interactions involving interlayer rubidium ions.

Crystal Structures of Ammonium and Cesium Pentadecafluorotetraantimonates(III)

New molybdenum(VI) complexes with N-monoalkylsubstituted hydroxylamines have been synthesized and studied. The structure of [MoO2(C2H5NHO)2] and [MoO2(i-C3H7NHO)2], whose distinguishing feature is the bidentate chelate coordination of the ligand to molybdenum with the formation of the three-membered NMoO chelate ring, has been determined by X-ray diffraction.