New BaM2(SeO3)3·nH2O (M = Co, Ni, Mn, Mg; n ≈ 3) Zemannite‐Type Frameworks: Single‐Crystal Structures of BaCo2(SeO3)3·3H2O, BaMn2(SeO3)3·3H2O and BaMg2(SeO3)3·3H2O

Johnston, Magnus G.; Harrison, William T. A.

doi:10.1002/ejic.201100344

Cited by 17 publications

(4 citation statements)

References 20 publications

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“…2). The recent definition of representatives of the form BaM 2 II (SeO 3 ) 3 Á3H 2 O is noted, [12] also containing octahedrally coordinated metal atoms and selenite pyramids, but differentiated from the present by the valence and form of the accompanying metal ion, as well as the degree of hydration, the latter forming the elegant family of zemannite-type salts.…”

Section: Resultsmentioning

confidence: 99%

“…[12] (9) 113.59 (12) 164.17 (10) 65.03 (9) 107.11 (9) 87.49 (10) 88.53(9) O(4) 3.090 (3) 104.68 (8) 149.21 (11) 126.00 (9) 78.54 (9) 78.52 (9) 52.27(9) 120.12(9) O (8) 3.046 (3) 73.22 (12) 123. 10(9) 78.76 (9) 130.72 (9) 116.82 (9) 52.02 (9) Transformations of the asymmetric unit: (i) 1 À x, 2 À y, 1 À z; (ii) 1 À x, 1 À y, 1 À z; (iii) x, 1 þ y, z; (iv) x, y À 1 2 , 3 2 À z; (v) 1 À x, y À 1 2 , 3 2 À z; (vi) x, 1 2 þ y, 3 2 À z; (vii) 1 À x, 1 2 þ y, 3 2 À z; (viii) x, y À 1, z; (ix) x, y, z.…”

Section: Resultsunclassified

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A Barium Vanadium(V) Selenite Hydrate, Ba(VO2)2(SeO3)2·H2O: A Novel 3D Polymer of Cross-Linked Sheets with Embedded ···V–O–V··· 21 Helices

et al. 2014

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The characterisation, by a single-crystal X-ray study at ,150 K, of brown acicular crystals of barium(II) bis(dioxovanadium(V)) bis(selenite(IV)) monohydrate, BaSe 2 V 2 O 10 ÁH 2 O, obtained as a minor product of the synthesis of the previously reported 'Ba(VO) 2 (SeO 3 ) 2 (HSeO 3 ) 2 ', is recorded. Crystals are monoclinic, P2 1 /c, a ¼ 10.803 (2)(3) Å 3 , 2456 independent diffractometer reflections refining to R1 ¼ 0.032, wR2 ¼ 0.084. A single BaV 2 Se 2 O 11 H 2 formula unit, devoid of crystallographic symmetry, comprises the asymmetric unit of the structure, which is a three-dimensional polymer, with component sheets parallel to the crystallographic b axis, containing pentavalent vanadium atoms, one five-, the other six-coordinate, linked by selenite pyramids.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsunclassified

A Barium Vanadium(V) Selenite Hydrate, Ba(VO2)2(SeO3)2·H2O: A Novel 3D Polymer of Cross-Linked Sheets with Embedded ···V–O–V··· 21 Helices

et al. 2014

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“…Distortions of the channels from the superordinate hexagonal symmetry have been observed for several other zemannite-type phases. In the crystal structures of Ba[M 2 (SeO 3 ) 3 ]•3H 2 O (M = Co, Mn, Mg) (Johnston and Harrison 2011), which exhibit a fourfold zemannite superstructure obtained by doubling a and b of the parent zemannite unit-cell, the M•••M distances as drawn in Fig. 3 vary by only a maximum of 0.15 Å compared to more than 0.6 Å for K[(Cu II ,Mn II ,Mn III ) 2 (TeO 3 ) 3 ]•2H 2 O.…”

Section: Distribution Of Extra-framework K + Ions and H 2 O Moleculesmentioning

confidence: 99%

“…During the 1990s, first synthetic zemannite-type phases moved into the spotlight of research, as exemplified by the oxidoselenates(IV) K 2 [Co II 2 (SeO 3 ) 3 ]•2H 2 O and K 2 [Ni II 2 (SeO 3 ) 3 ]•2H 2 O (Wildner 1993), and the oxidotellurates(IV) Na 2 [Co II 2 (TeO 3 ) 3 ]•3H 2 O and Na 2 [Zn II 2 (TeO 3 ) 3 ]•3H 2 O (Miletich 1995b). Pioneering work produced various new oxidoselenates(IV) and -tellurates(IV) with Na + , K + , and Ba 2+ cations in the channels, and even examples revealing neutral frameworks and empty channels have been reported (Wontcheu and Schleid 2003;Kong et al 2010;Johnston and Harrison 2011). The first synthetic zemannite-type phases containing more than one transition metal cation, with compositions of Na x Editorial handling: T. Armbruster…”

Section: Introductionmentioning

confidence: 99%

K[(CuII,MnII,MnIII)2(TeO3)3]∙2H2O, the first zemannite-type structure based on a Jahn-Teller-distorted framework

2023

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Synthetic single crystals of K[(CuII,MnII,MnIII)2(TeO3)3]·2H2O were obtained from an overconcentrated alkaline aqueous solution in the system K2O-MnO-CuO-TeO2 under hydrothermal conditions at T ≤ 220 °C. Subeuhedral single crystals have been investigated by means of single-crystal X-ray diffraction. The crystal structure of this new zemannite-type representative adopts a monoclinic twofold superstructure. The doubling of the unit-cell volume is accompanied by a hexagonal-to-monoclinic symmetry reduction, resulting in threefold twinning with individual crystal domains following the space group symmetry P21. Refinements of site-occupation factors and the evaluation of bond valences suggest a distribution of di- and trivalent cations at the octahedrally coordinated M sites with a ratio (CuII + MnII):MnIII approximating 1:1. Based on arguments about the cation sizes and the individual bond valence sums, a distribution of CuII1–xMnIIIx and MnIIx MnIII1–x at each two of the four M sites can be assumed with x between ~ 0.14 and ~ 0.50. The K+ cations and H2O molecules inside the channels are located off the central channel axis. In contrast to most other known zemannite-type phases, the extra-framework atoms show full occupancies and are not disordered. The distribution of the channel contents supports the anisotropic deformation of the surrounding framework, which follows the local symmetry reduction as required for the Jahn-Teller distortion of the octahedrally coordinated M sites within the framework. The arrangement of the deformed channels can be understood as the origin of the existing superstructure.

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Simple Construction of Amorphous Monometallic Cobalt‐Based Selenite Nanoparticles using Ball Milling for Highly Efficient Oxygen Evolution Reaction

et al. 2021

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Amorphous transition‐metal based materials with disordered structure are very desirable in the field of sustainable energy devices and technologies such as water‐splitting and secondary batteries due to their inherent properties of anisotropy and defects. To date, it is very urgent to explore new methods to prepare amorphous electrocatalysts. Herein, we use a simple approach to construct amorphous Co‐based selenite electrocatalyst by mechanical ball milling for oxygen evolution reaction (OER). Due to its amorphous structure as well as more active species, the obtained amorphous cobalt selenite C4S‐12 h material on the glassy carbon electrode shows superior electrochemical performance with a low overpotential of 255 mV to drive 10 mA cm−2 in 1.0 M KOH electrolyte. In addition, this catalyst also has an excellent intrinsic activity (high mass activity of 162.0 A g−1 and TOF of 0.063 s−1 at the overpotential of 350 mV) and remarkable long‐term stability (at least 32 h at a current density of 10 mA cm−2). This study offers a simple and environmentally friendly method to construct highly efficient electrocatalysts for water oxidation.

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New BaM₂(SeO₃)₃·nH₂O (M = Co, Ni, Mn, Mg; n ≈ 3) Zemannite‐Type Frameworks: Single‐Crystal Structures of BaCo₂(SeO₃)₃·3H₂O, BaMn₂(SeO₃)₃·3H₂O and BaMg₂(SeO₃)₃·3H₂O

Cited by 17 publications

References 20 publications

A Barium Vanadium(V) Selenite Hydrate, Ba(VO2)2(SeO3)2·H2O: A Novel 3D Polymer of Cross-Linked Sheets with Embedded ···V–O–V··· 21 Helices

A Barium Vanadium(V) Selenite Hydrate, Ba(VO2)2(SeO3)2·H2O: A Novel 3D Polymer of Cross-Linked Sheets with Embedded ···V–O–V··· 21 Helices

K[(CuII,MnII,MnIII)2(TeO3)3]∙2H2O, the first zemannite-type structure based on a Jahn-Teller-distorted framework

Simple Construction of Amorphous Monometallic Cobalt‐Based Selenite Nanoparticles using Ball Milling for Highly Efficient Oxygen Evolution Reaction

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