The Crystal Structure of Potassium Chromato Iodate, KCrIO6.

Löfgren, Percy; Lindblom, Torbjörn; Wahlund, Bengt; Cyvin, S. J.; Hägen, G.

doi:10.3891/acta.chem.scand.21-2781

Cited by 17 publications

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“…UO 3 (99.8%, Alfa-Aesar), CsCl (99.9%, Alfa-Aesar), RbCl (99%, Alfa-Aesar), KCl (Ultrapure, Alfa-Aesar), I 2 O 5 (98%, Alfa-Aesar), Cs 2 CO 3 (99%, Alfa-Aesar), Rb 2 CO 3 (99%, Alfa-Aesar), H 5 IO 6 (98%, Alfa-Aesar), HIO 3 (99.5%, Alfa-Aesar), K 2 -Cr 2 O 7 (ACS certified, Fisher), CrO 3 (99.8%, J. T. Baker), and MoO 3 (99.95%, Alfa-Aesar) were used as received. AIO 4 (A ) Rb, Cs) 40 and K[CrO 3 (IO 3 )] 41 were prepared by literature methods. Rb[CrO 3 -(IO 3 )] and Cs[CrO 3 (IO 3 )] were prepared by heating an equimolar amount of the appropriate alkali metal metaperiodate with CrO 3 in aqueous media at 180 °C for 72 h. Distilled and Millipore filtered water with a resistance of 18.2 MΩ was used in all reactions.…”

Section: Methodsmentioning

confidence: 99%

Mixed-Metal Uranium(VI) Iodates: Hydrothermal Syntheses, Structures, and Reactivity of Rb[UO₂(CrO₄)(IO₃)(H₂O)], A₂[UO₂(CrO₄)(IO₃)₂] (A = K, Rb, Cs), and K₂[UO₂(MoO₄)(IO₃)₂]

et al. 2002

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The reactions of the molecular transition metal iodates A[CrO(3)(IO(3))] (A = K, Rb, Cs) with UO(3) under mild hydrothermal conditions provide access to four new, one-dimensional, uranyl chromatoiodates, Rb[UO(2)(CrO(4))(IO(3))(H(2)O)] (1) and A(2)[UO(2)(CrO(4))(IO(3))(2)] (A = K (2), Rb (3), Cs (4)). Under basic conditions, MoO(3), UO(3), and KIO(4) can be reacted to form K(2)[UO(2)(MoO(4))(IO(3))(2)] (5), which is isostructural with 2 and 3. The structure of 1 consists of one-dimensional[UO(2)(CrO(4))(IO(3))(H(2)O)](-) ribbons that contain uranyl moieties bound by bridging chromate and iodate anions as well as a terminal water molecule to create [UO(7)] pentagonal bipyramidal environments around the U(VI) centers. These ribbons are separated from one another by Rb(+) cations. When the iodate content is increased in the hydrothermal reactions, the terminal water molecule is replaced by a monodentate iodate anion to yield 2-4. These ribbons can be further modified by replacing tetrahedral chromate anions with MoO(4)(2)(-) anions to yield isostructural, one-dimensional [UO(2)(MoO(4))(IO(3))(2)](2)(-) ribbons. Crystallographic data: 1, triclinic, space group P(-)1, a = 7.3133(5) A, b = 8.0561(6) A, c = 8.4870(6) A, alpha = 88.740(1) degrees, beta = 87.075(1) degrees, gamma = 71.672(1) degrees, Z = 2; 2, monoclinic, space group P2(1)/c, a = 11.1337(5) A, b = 7.2884(4) A, c = 15.5661(7) A, beta = 107.977(1) degrees, Z = 4; 3, monoclinic, space group P2(1)/c, a = 11.3463(6) A, b = 7.3263(4) A, c = 15.9332(8) A, beta = 108.173(1) degrees, Z = 4; 4, monoclinic, space group P2(1)/n, a = 7.3929(5) A, b = 8.1346(6) A, c = 22.126(2) A, beta = 90.647(1) degrees, Z = 4; 5, monoclinic, space group P2(1)/c, a = 11.3717(6) A, b = 7.2903(4) A, c = 15.7122(8) A, beta = 108.167(1) degrees, Z = 4.

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Section: Methodsmentioning

confidence: 99%

Mixed-Metal Uranium(VI) Iodates: Hydrothermal Syntheses, Structures, and Reactivity of Rb[UO₂(CrO₄)(IO₃)(H₂O)], A₂[UO₂(CrO₄)(IO₃)₂] (A = K, Rb, Cs), and K₂[UO₂(MoO₄)(IO₃)₂]

et al. 2002

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“…KCrIO 6 (P2 1 /c, CS) can also be formulated as KCrO 3 (IO 3 ) and its structure features a 0D [CrO 3 (IO 3 )]  anionic unit composed of a CrO 4 tetrahedron corner-sharing with a IO 3 group [65]. These 0D units are separated by the K + cations.…”

Section: A-cr/mo/w-i(v)-o Systemmentioning

confidence: 99%

Structures and properties of functional metal iodates

2011

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Metal iodates with a lone-pair containing I(V) that is in an asymmetric coordination geometry can form a diversity of unusual structures and many of them are promising new second homonic generation (SHG) materials. They exhibit wide transparency wavelength regions, large SHG coefficients and high optical-damage thresholds as well as moderately high thermal stability. In this paper, the structures and properties of the metal iodates are reviewed. The combination of d 0 transition-metal cations with the iodate groups afforded a large number of metal iodates, with cations covering alkali metal, alkaline earth and lanthanide elements. Many of them are noncentrosymmetric (NCS) and display excellent SHG properties due to the additive effects of polarizations from both types of the asymmetric units. Some lanthanide iodates are able to emit strong luminescence in the visible or near-IR regions. The use of transition metal ions with d n (n ≠ 0) electronic configuration into iodate systems can also induce the formation of NCS compounds when the lone pairs of the iodate groups are properly aligned. The d n transition metal cations are normally octahedrally coordinated or in a square-planar coordination geometry. Furthermore, the combination of two different types of lone-pair-containing cations is also an effective strategy to design new SHG materials. second homonic generation (SHG), metal iodates, crystal structures, structure-property relationship

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“…This is the first molecular actinide iodate. Molecular iodates containing metals are rare in general, being known only from [CrO 3 (IO 3 )] 1-, 16 [MoO 2 -(IO 3 ) 4 ] 2-, 17 and [M(IO 3 ) 6 ] 2-(M ) Ti, 18 Zr, 19 Mo 19 ). An important comparison to be made is between the [MoO 2 -(IO 3 ) 4 ] 2and [UO 2 (IO 3 ) 4 (H 2 O)] 2anions.…”

Section: Resultsmentioning

confidence: 99%

Structural Polarity Induced by Cooperative Hydrogen Bonding and Lone-Pair Alignment in the Molecular Uranyl Iodate Na₂[UO₂(IO₃)₄(H₂O)]

et al. 2006

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Na2[UO2(IO3)4(H2O)] has been synthesized under mild hydrothermal conditions. Its structure consists of Na+ cations and [UO2(IO3)4(H2O)](2-) anions. The [UO2(IO3)4(H2O)](2-) anions are formed from the coordination of a nearly linear uranyl, UO2(2+), cation by four monodentate IO(3-) anions and a coordinating water molecule to yield a pentagonal bipyramidal environment around the uranium center. The water molecules form intermolecular hydrogen bonds with the terminal oxo atoms of neighboring [UO2(IO3)4(H2O)](2-) anions to yield one-dimensional chains that extend down the b axis. There are two crystallographically unique iodate anions in the structure of Na2[UO2(IO3)4(H2O)]. One of these anions is aligned so that the lone-pair of electrons is also directed along the b axis. The overall structure is therefore polar, owing to the cooperative alignment of both the hydrogen bonds and the lone-pair of electrons on iodate. The polarity of the monoclinic space group C2 (a = 11.3810(12) A, b = 8.0547(8) A, c = 7.6515(8) A, beta = 90.102(2) degrees , Z = 2, T = 193 K) found for this compound is consistent with the structure. Second-harmonic generation of 532 nm light from a 1064 nm laser source yields a response of approximately 16x alpha-SiO2.

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The Crystal Structure of Potassium Chromato Iodate, KCrIO6.

Cited by 17 publications

References 0 publications

Mixed-Metal Uranium(VI) Iodates: Hydrothermal Syntheses, Structures, and Reactivity of Rb[UO₂(CrO₄)(IO₃)(H₂O)], A₂[UO₂(CrO₄)(IO₃)₂] (A = K, Rb, Cs), and K₂[UO₂(MoO₄)(IO₃)₂]

Mixed-Metal Uranium(VI) Iodates: Hydrothermal Syntheses, Structures, and Reactivity of Rb[UO₂(CrO₄)(IO₃)(H₂O)], A₂[UO₂(CrO₄)(IO₃)₂] (A = K, Rb, Cs), and K₂[UO₂(MoO₄)(IO₃)₂]

Structures and properties of functional metal iodates

Structural Polarity Induced by Cooperative Hydrogen Bonding and Lone-Pair Alignment in the Molecular Uranyl Iodate Na₂[UO₂(IO₃)₄(H₂O)]

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The Crystal Structure of Potassium Chromato Iodate, KCrIO6.

Cited by 17 publications

References 0 publications

Mixed-Metal Uranium(VI) Iodates: Hydrothermal Syntheses, Structures, and Reactivity of Rb[UO2(CrO4)(IO3)(H2O)], A2[UO2(CrO4)(IO3)2] (A = K, Rb, Cs), and K2[UO2(MoO4)(IO3)2]

Mixed-Metal Uranium(VI) Iodates: Hydrothermal Syntheses, Structures, and Reactivity of Rb[UO2(CrO4)(IO3)(H2O)], A2[UO2(CrO4)(IO3)2] (A = K, Rb, Cs), and K2[UO2(MoO4)(IO3)2]

Structures and properties of functional metal iodates

Structural Polarity Induced by Cooperative Hydrogen Bonding and Lone-Pair Alignment in the Molecular Uranyl Iodate Na2[UO2(IO3)4(H2O)]

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Mixed-Metal Uranium(VI) Iodates: Hydrothermal Syntheses, Structures, and Reactivity of Rb[UO₂(CrO₄)(IO₃)(H₂O)], A₂[UO₂(CrO₄)(IO₃)₂] (A = K, Rb, Cs), and K₂[UO₂(MoO₄)(IO₃)₂]

Mixed-Metal Uranium(VI) Iodates: Hydrothermal Syntheses, Structures, and Reactivity of Rb[UO₂(CrO₄)(IO₃)(H₂O)], A₂[UO₂(CrO₄)(IO₃)₂] (A = K, Rb, Cs), and K₂[UO₂(MoO₄)(IO₃)₂]

Structural Polarity Induced by Cooperative Hydrogen Bonding and Lone-Pair Alignment in the Molecular Uranyl Iodate Na₂[UO₂(IO₃)₄(H₂O)]