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Syntheses and crystal structures of two novel alkaline uranyl chromates A 2(UO 2)(CrO 4) 2 (A=Rb, Cs) with bidentate coordination mode of uranyl ions by chromate anions. / Siidra, Oleg I.; Nazarchuk, Evgeny V.; Krivovichev, Sergey V.
In: Journal of Solid State Chemistry, Vol. 187, 03.2012, p. 286-290.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Syntheses and crystal structures of two novel alkaline uranyl chromates A 2(UO 2)(CrO 4) 2 (A=Rb, Cs) with bidentate coordination mode of uranyl ions by chromate anions
AU - Siidra, Oleg I.
AU - Nazarchuk, Evgeny V.
AU - Krivovichev, Sergey V.
PY - 2012/3
Y1 - 2012/3
N2 - Single crystals of Cs 2(UO 2)(CrO 4) 2 and Rb 2(UO 2)(CrO 4) 2 were prepared by solid state reactions. The structures are based upon the [(UO 2)(CrO 4) 2] 2- chains. Within the chains, UrO 5 pentagonal bipyramids (Ur=uranyl) form Ur 2O 8 dimers, which are linked via CrO 4 tetrahedra into one-dimensional chains. The CrO 4 tetrahedra coordinate uranyl ions in both mono- and bidentate fashion, which is unusual for uranyl chromates. The bidentate coordination has a strong influence upon geometrical parameters of both U and Cr coordination polyhedra. The conformation of the chains in 1 and 2 is different due to the different size of the Cs and Rb cations.
AB - Single crystals of Cs 2(UO 2)(CrO 4) 2 and Rb 2(UO 2)(CrO 4) 2 were prepared by solid state reactions. The structures are based upon the [(UO 2)(CrO 4) 2] 2- chains. Within the chains, UrO 5 pentagonal bipyramids (Ur=uranyl) form Ur 2O 8 dimers, which are linked via CrO 4 tetrahedra into one-dimensional chains. The CrO 4 tetrahedra coordinate uranyl ions in both mono- and bidentate fashion, which is unusual for uranyl chromates. The bidentate coordination has a strong influence upon geometrical parameters of both U and Cr coordination polyhedra. The conformation of the chains in 1 and 2 is different due to the different size of the Cs and Rb cations.
KW - Bidentate coordination
KW - Single crystal X-ray diffraction
KW - Structure determination
KW - Uranyl chromates
UR - http://www.scopus.com/inward/record.url?scp=84857232149&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2012.01.037
DO - 10.1016/j.jssc.2012.01.037
M3 - Article
AN - SCOPUS:84857232149
VL - 187
SP - 286
EP - 290
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
SN - 0022-4596
ER -
ID: 9145299