Synthesis and crystal structure of [UO2(L)(OH)], (CN3H6)2[(UO2)2CrO4(L)4 · 2H2O and [UO2(H2O)5][(UO2)2Cr2O7(L)4] (where L is picolinate ion)

Autor: Larisa B. Serezhkina, A. V. Virovets, Victor N. Serezhkin, S. A. Novikov, Eugenia V. Peresypkina
Rok vydání: 2014
Předmět:
Zdroj: Russian Journal of Inorganic Chemistry. 59:63-71
ISSN: 1531-8613
0036-0236
Popis: [[UO2(L)(OH)] (I), (CN3H6)2[(UO2)2CrO4(L)4] · 2H2O (II), and [UO2(H2O)5][(UO2)2Cr2O7(L)4] (III) crystals, where L is picolinate ion C5H4NCOO−, have been synthesized and studied by X-ray diffraction and IR spectroscopy. Complex I crystallizes in triclinic system with the unit cell parameters a = 6.2858(5) A, b = 7.9522(5) A, c = 8.3598(6) A, α = 79.527(6)°, β = 87.760(6)°, γ = 79.126(6)°, space group P $\bar 1$ , Z = 2, R = 0.0306, and complexes II and III crystalize in monoclinic system with a = 8.8630(9) A, b = 13.4540(13) A, c = 31.266(3) A, β = 93.118(3)°, space group C2/c, Z = 4, R = 0.0187 (II), and a = 7.3172(4) A, b = 15.4719(8) A, c = 16.6534(10) A, β = 98.943(4)°, space group P21/m, Z = 2, R = 0.0588 (III). The structure of complex I is built of electronegative [UO2(L)(OH)] chains, which belong to the AT11M2 crystallochemical group (A = UO 2 2+ , T11 = L, M2 = OH−) of uranyl complexes. The structure of complexes II and III contains [(UO2)2(L′)(L)4]2− dimers (L′ = CrO 4 2− or Cr2O 7 2− ), which belong to the A2B2B 4 01 group (A = UO 2 2+ ,B2 = L′, B01 = L). The specifics of intermolecular interactions in the structures of complexes I–III and some their analogues have been considered using molecular Voronoi-Dirichlet polyhedra.
Databáze: OpenAIRE
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