The role of potassium atoms in the formation of uranyl selenates

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The role of potassium atoms in the formation of uranyl selenates : the crystal structure and synthesis of two novel compounds. / Gurzhiy, Vladislav V.; Tyumentseva, Olga S.; Kornyakov, Ilya V.; Krivovichev, Sergey V.; Tananaev, Ivan G.

In: Journal of Geosciences (Czech Republic), Vol. 59, No. 2, 2014, p. 123-133.

Research output: Contribution to journal › Article › peer-review

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@article{7d366f08a8f74f3dacd944b19200dd22,

title = "The role of potassium atoms in the formation of uranyl selenates: the crystal structure and synthesis of two novel compounds",

abstract = "Single crystals of two new uranyl selenates K3(H 3O)[(UO2)4(SeO4)6(H2O)4] ·5H2O (I) and K2.5(NO3)0.5[(UO2) 2(SeO4)3 (H2O)]·4H 2O (II) have been prepared by room-temperature evaporation from aqueous solution of uranyl nitrate, selenic acid, potassium carbonate and (for the compound I) carbamide. The crystal structure of I has been solved by direct methods [monoclinic, P21/m, a = 12.001(3), b = 13.613(3), c = 13.753(3) {\AA}, β = 109.187(4)°, V = 2122.0(8) {\AA}3 and Z = 2] and refined to R1 = 0.029 (wR2 = 0.084) for 4865 reflections with |Fo| = 4sF using least-square methods. The crystal structure of II has been solved by direct methods [monoclinic, ?2/?, a = 20.290(4), b = 10.380(2), c = 21.436(4) {\AA}, β = 103.446(3)°, V = 4391.0(13) {\AA}3 and Z = 4] and refined to R1 = 0.027 (wR2 = 0.066) for 7944 reflections with |Fo| = 4sF using least-square techniques. The structures of I and II are based upon the [(UO 2)2(SeO4)3(H2O) 2]2- and [(UO2)2(SeO4) 3(H2O)]2- layers, respectively, consisting of UO7 pentagonal bipyramids sharing corners with SeO4 tetrahedra. Potassium cations induce curvature of the uranyl selenate layers, which is mediated by the interlayer water molecules, hydronium ions and nitrate groups. The topology of the 2D units in the structure of I is novel for the structural chemistry of uranyl selenates.",

keywords = "Crystal structure, Potassium, Single-crystal X-ray diffraction, Topology, Uranyl selenates",

author = "Gurzhiy, {Vladislav V.} and Tyumentseva, {Olga S.} and Kornyakov, {Ilya V.} and Krivovichev, {Sergey V.} and Tananaev, {Ivan G.}",

year = "2014",

doi = "10.3190/jgeosci.165",

language = "English",

volume = "59",

pages = "123--133",

journal = "Journal of Geosciences",

issn = "1802-6222",

publisher = "Czech Geological Survey",

number = "2",

}

RIS

TY - JOUR

T1 - The role of potassium atoms in the formation of uranyl selenates

T2 - the crystal structure and synthesis of two novel compounds

AU - Gurzhiy, Vladislav V.

AU - Tyumentseva, Olga S.

AU - Kornyakov, Ilya V.

AU - Krivovichev, Sergey V.

AU - Tananaev, Ivan G.

PY - 2014

Y1 - 2014

N2 - Single crystals of two new uranyl selenates K3(H 3O)[(UO2)4(SeO4)6(H2O)4] ·5H2O (I) and K2.5(NO3)0.5[(UO2) 2(SeO4)3 (H2O)]·4H 2O (II) have been prepared by room-temperature evaporation from aqueous solution of uranyl nitrate, selenic acid, potassium carbonate and (for the compound I) carbamide. The crystal structure of I has been solved by direct methods [monoclinic, P21/m, a = 12.001(3), b = 13.613(3), c = 13.753(3) Å, β = 109.187(4)°, V = 2122.0(8) Å3 and Z = 2] and refined to R1 = 0.029 (wR2 = 0.084) for 4865 reflections with |Fo| = 4sF using least-square methods. The crystal structure of II has been solved by direct methods [monoclinic, ?2/?, a = 20.290(4), b = 10.380(2), c = 21.436(4) Å, β = 103.446(3)°, V = 4391.0(13) Å3 and Z = 4] and refined to R1 = 0.027 (wR2 = 0.066) for 7944 reflections with |Fo| = 4sF using least-square techniques. The structures of I and II are based upon the [(UO 2)2(SeO4)3(H2O) 2]2- and [(UO2)2(SeO4) 3(H2O)]2- layers, respectively, consisting of UO7 pentagonal bipyramids sharing corners with SeO4 tetrahedra. Potassium cations induce curvature of the uranyl selenate layers, which is mediated by the interlayer water molecules, hydronium ions and nitrate groups. The topology of the 2D units in the structure of I is novel for the structural chemistry of uranyl selenates.

AB - Single crystals of two new uranyl selenates K3(H 3O)[(UO2)4(SeO4)6(H2O)4] ·5H2O (I) and K2.5(NO3)0.5[(UO2) 2(SeO4)3 (H2O)]·4H 2O (II) have been prepared by room-temperature evaporation from aqueous solution of uranyl nitrate, selenic acid, potassium carbonate and (for the compound I) carbamide. The crystal structure of I has been solved by direct methods [monoclinic, P21/m, a = 12.001(3), b = 13.613(3), c = 13.753(3) Å, β = 109.187(4)°, V = 2122.0(8) Å3 and Z = 2] and refined to R1 = 0.029 (wR2 = 0.084) for 4865 reflections with |Fo| = 4sF using least-square methods. The crystal structure of II has been solved by direct methods [monoclinic, ?2/?, a = 20.290(4), b = 10.380(2), c = 21.436(4) Å, β = 103.446(3)°, V = 4391.0(13) Å3 and Z = 4] and refined to R1 = 0.027 (wR2 = 0.066) for 7944 reflections with |Fo| = 4sF using least-square techniques. The structures of I and II are based upon the [(UO 2)2(SeO4)3(H2O) 2]2- and [(UO2)2(SeO4) 3(H2O)]2- layers, respectively, consisting of UO7 pentagonal bipyramids sharing corners with SeO4 tetrahedra. Potassium cations induce curvature of the uranyl selenate layers, which is mediated by the interlayer water molecules, hydronium ions and nitrate groups. The topology of the 2D units in the structure of I is novel for the structural chemistry of uranyl selenates.

KW - Crystal structure

KW - Potassium

KW - Single-crystal X-ray diffraction

KW - Topology

KW - Uranyl selenates

UR - http://www.scopus.com/inward/record.url?scp=84973865237&partnerID=8YFLogxK

U2 - 10.3190/jgeosci.165

DO - 10.3190/jgeosci.165

M3 - Article

AN - SCOPUS:84973865237

VL - 59

SP - 123

EP - 133

JO - Journal of Geosciences

JF - Journal of Geosciences

SN - 1802-6222

IS - 2

ER -

ID: 9151878

The role of potassium atoms in the formation of uranyl selenates: the crystal structure and synthesis of two novel compounds

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