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Isopropylammonium Layered Uranyl Chromates: Syntheses and Crystal Structures of [(CH 3 ) 2 CHNH 3 ] 3 [(UO 2 ) 3 (CrO 4 ) 2 O(OH) 3 ] and[(CH 3 ) 2 CHNH 3 ] 2 [(UO 2 ) 2 (CrO 4 ) 3 (H 2 O)]
Author(s) -
Siidra Oleg I.,
Nazarchuk Evgeny V.,
Krivovichev Sergey V.
Publication year - 2012
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201100558
Subject(s) - uranyl , crystallography , monoclinic crystal system , crystal structure , electron microprobe , chemistry , octahedron , selenate , x ray crystallography , hydrothermal synthesis , hydrothermal circulation , inorganic chemistry , uranium , materials science , diffraction , mineralogy , selenium , organic chemistry , seismology , geology , physics , optics , metallurgy
Abstract Two novel isopropylamine‐templated uranyl chromates, [(CH 3 ) 2 CHNH 3 ] 3 [(UO 2 ) 3 (CrO 4 ) 2 O(OH) 3 ] ( 1 ) and [(CH 3 ) 2 CHNH 3 ] 2 [(UO 2 ) 2 (CrO 4 ) 3 (H 2 O)] ( 2 ) were prepared by hydrothermal method at 100 °C. The compounds were characterized by electron microprobe analysis and X‐ray diffraction crystal structure analysis [ 1 : trigonal, P 31 m , a = 9.646(4), c = 8.469(4) Å, V = 682.4(5) Å 3 ; 2 : monoclinic, P 2 1 / c , a = 11.309(3), b = 11.465(3), c = 17.055(5) Å, β = 99.150(6)°, V = 2183.2(11) Å 3 ]. The structure of 1 is based upon trimers of uranyl bipyramids interlinked by CrO 4 tetrahedra to form [(UO 2 ) 3 (CrO 4 ) 2 O(OH) 3 ] 3– layers, whereas, in the structure of 2 , UO 7 and UO 6 (H 2 O) pentagonal bipyramids are linked through CrO 4 tetrahedra into the [(UO 2 ) 2 (CrO 4 ) 3 (H 2 O)] 2– layers. The structures show many similarities to related uranyl selenate compounds, thus providing additional data on similarities and differences between uranyl sulfates, chromates, selenates, and molybdates.