Dmitry V. Albov

Structural features of the crystalline iodide complexes of some rare-earth elements with carbamide and acetamide

New acetamide and carbamide complexes LnI3 · 4Ur · 4H2O (Ln = La, Eu, Dy, Ho, Y; Ur is carbamide) and LnI3 · 4AA · 4H2O (Ln = Nd, Eu, Dy, Ho, Y; AA is acetamide) are synthesized. The complexes are characterized by the data of chemical analysis, IR spectroscopy, and X-ray diffraction analysis. The ligands (water, carbamide, and acetamide molecules) are coordinated by the rare-earth element atoms through the oxygen atom, and the coordination polyhedron is a distorted square antiprism. The iodide ions are not coordinated and are located in the external sphere. The structural characteristics of the complexes are compared in the series [Ln(L)4(H2O)4]I3 (Ln = La, Nd, Eu, Gd, Dy, Ho, Er; L = AA, Ur).

Synthesis and structure of zinc iodide complex with thiocarbamide, [Zn(CH4N2S)2I2]

A complex compound of zinc iodide with thiocarbamide [Zn(CH4N2S)2I2] is obtained and its structure is studied by X-ray diffraction. Crystals are monoclinic, a = 10.494(2) Å, b = 7.473(2) Å, c = 14.871(4) Å, β = 91.354(18)°, V = 1165.9(5) Å3, space group P21/c, Z = 4. The structural unit of the crystal is molecular complex [Zn(CH4N2S)2I2], in which the zinc atom is coordinated by sulfur atoms of two thiocarbamide molecules and two iodine atoms.

Halide polyhydrates of some rare-earth elements: Synthesis and structures

Scandium, yttrium, lanthanum, cerium, and terbium bromides and iodides of the formulas [(H2O)5Sc(μ-OH)2Sc(H2O)5]Br4 · 2H2O (I), [(H2O)5Sc(μ-OH)2Sc(H2O)5]I4 (II), [Y(H2O)8]Br3 · 2H2O (III), [(H2O)7La(μ-Br)2La(H2O)7]Br4 (IV), [Ce(H2O)9]I3 (V), and [Tb(H2O)9]I3 (VI) were obtained and examined using X-ray diffraction and IR and Raman spectroscopy. It was found that the compositions and structures of complexes II and III differ from the literature data. Crystallographic parameters were obtained for isostructural complexes V and VI. It was demonstrated that the conditions of the synthesis and the possibility of protolysis are decisive for the formation of polynuclear oxo and hydroxo complexes of rare-earth metal halides.

X-ray Mapping in Heterocyclic Design: XIII. Structure of Substituted Tetrahydroquinolines

AbstractThe structures of 4-methyl-2-chloro-5,6,7,8-tetrahydroquinoline [a = 8.138(2) Å, b = 11.127(4) Å, c = 11.234(2) Å, β = 111.30(2)°, Z = 4, space group P21/c, 4-methyl-2-methoxy-5,6,7,8-tetrahydroquinoline [a = 5.7651(16) Å, b = 8.530(2) Å, c = 10.455(3) Å, α = 73.76(2)°, β = 86.95(2)°, γ = 83.97(2)°, Z = 2, space group P

Complexes of erbium and lutetium bromides with carbamide: Synthesis and structures

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Beyond the Dimer and Trimer: Tetraspiro[2.1.25.1.29.1.213.13] hexadecane‐1,3,5,7‐tetraone—the Cyclic Tetramer of Carbonylcyclopropane

, 4-methyl-2-(4-chlorophenacyl)-5,6,7,8-tetrahydro-1H-quinolin-2-one [a = 8.873(2) Å, b = 17.137(2) Å, c = 24.515(4) Å, Z = 8, space group Pbn21], and 2-(4-chlorophenyl)-5-methyl-6,7,8,9-tetrahy-drooxazolo[3.2-a]quinolin-10-ylium perchlorate [a = 8.110(6) Å, b = 17.818(7) Å, c = 17.721(5) Å, β = 100.46(4)°, Z = 4, space group P21/c] are studied by single-crystal X-ray diffraction. The structures are solved by direct methods and refined by the full-matrix least-squares procedures in the anisotropic approximation to R = 0.0581, 0.0667, 0.0830, and 0.0607, respectively.

Thiocarbamide derivatives of europium, holmium, and erbium iodides: Synthesis and structures

The novel carbamide complexes of gadolinium and erbium iodides of the composition LnI34Ur·4H2O (Ln = Gd, Er; Ur = carbamide) were synthesized and studied by X-ray diffraction and IR spectroscopy. The ligands are coordinated to the central Gd or Er atom through the O atoms of water or carbamide molecules. The coordination polylhedron of Ln atoms is a distorted square antiprism. The iodide ions are not coordinated and lie in the outer sphere.

Synthesis and crystal structures of nitratocobaltates Na2[Co(NO3)4], K2[Co(NO3)4], and Ag[Co(NO3)3] and potassium nitratonickelate K2[Ni(NO3)4]

The synthesis and data of the study of new complexes of erbium and lutetium bromides with carbamide, [Ln(Ur)4(H2O)4]Br3 (I and III) and [Ln(Ur)6(H2O)2]Br3 (II and IV) (Ln = Er and Lu), by IR spectroscopy and X-ray diffraction analysis are presented. For all four compounds, coordination with metal occurs through the oxygen atoms of the water and carbamide molecules. The coordination polyhedra of the Ln atoms are distorted square antiprisms. Coordination of four carbamide molecules does not change their planar structures. The bromide ions are not coordinated, existing in the external sphere. Many hydrogen bonds are observed in the structures of complexes of both types.