Syntheses and characterization of elpasolite-type ammonium alkali metal hexafluorometallates(III)

Mi, Jin‐Xiao; Luo, Saiyu; Sun, Hua-Yu; Liu, Xiaoxuan; Wei, Ziheng

doi:10.1016/j.jssc.2008.03.017

Cited by 20 publications

(8 citation statements)

References 27 publications

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“…The broad peak at ≈ 3000 cm –1 is readily assigned to the asymmetrical stretching mode ( υ 3 ) of the [NH 4 ] + group. The sharp peak at 1435 cm –1 is attributed to the asymmetric bending mode ( υ 4 ) of the [NH 4 ] + group , . A series of peaks at 1101, 1064, 1019 and 961 cm –1 can be assigned to the asymmetrical stretching modes ( υ 3 ) of the [PO 4 ] 3– group, while the peaks at 649, 614, 582, and 557 cm –1 are typical for the asymmetric bending mode ( υ 4 ) of the [PO 4 ] 3– group , .…”

Section: Resultsmentioning

confidence: 99%

Rational Design of (NH₄)Cu[PO₄] with a Spin Gapped, Distorted Honeycomb Layer

et al. 2020

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Water (H 2 O) molecules are often used to depolymerize crystal structures. Conversely, polycondensation of basic building units of crystal structures can be realized by removing water molecules from hydrous compounds. Herein, we report our rational design and synthesis of a novel copper phosphate (NH 4 )Cu[PO 4 ] from a hydrothermal route with minimal water used. The title compound keeps the layered structural feature of its hydrous analogue (NH 4 )Cu[PO 4 ]·H 2 O, but the isolated centrosymmetric [Cu 2 O 8 ] dimers in the latter further polymerize into a two-dimensional (2D) corrugated honeycomb layer in the [a] Fujian

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Section: Resultsmentioning

confidence: 99%

Rational Design of (NH₄)Cu[PO₄] with a Spin Gapped, Distorted Honeycomb Layer

et al. 2020

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“…The effective radius of the (NH 4 ) + group is approximately similar to that of Rb + [18]. Further synthesis experiments are needed to explore whether larger cations (e.g., Cs + ) or organic groups are capable of stabilizing longer linear clusters (i.e., tetramers) and pentamers of ferric iron octahedra (and those of other trivalent cations) in F-bearing phosphate systems.…”

Section: Discussionmentioning

confidence: 99%

“…The FT-IR spectrum of the title compound ( Fig. 1) [18][19][20]. Semi-quantitative EDS analyses yielded an average F:Fe:P atomic ratio of $2:3:4 (see ESI Fig.…”

Section: Description Of the Title Compoundmentioning

confidence: 99%

Synthesis and crystal structure of a new open-framework iron phosphate (NH4)4Fe3(OH)2F2[H3(PO4)4]: Novel linear trimer of corner-sharing Fe(III) octahedra

Wang

Chen

et al. 2010

Journal of Solid State Chemistry

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“…The X-ray powder data for the latter were reported by Wani et al (1982) which coincide with our data and those reported by Stomberg (1986). Note also that all (NH 4 ) 2 NaM III F 6 (M III = Al, Fe, Ga, In, Cr, V) are cubic elpasolites (Mi et al, 2008).…”

Section: The Na 2 Vof 5 Elpasolitementioning

confidence: 97%

Orientational disorder and phase transitions in ammonium oxofluorovanadates, (NH₄)₃VOF₅ and (NH₄)₃VO₂F₄

Udovenko

Pogorel’tsev

Marchenko

et al. 2017

Acta Crystallogr Sect B

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Single crystals of (NH 4 ) 3 VOF 5 and (NH 4 ) 3 VO 2 F 4 were obtained from aqueous fluoride solutions and phase transitions in these compounds were investigated using X-ray diffraction, differential scanning microcalorimetry (DSM) and vibrational spectroscopy. The room-temperature (RT) phases of these compounds belong to orthorhombic symmetry [Immm and I222, Z = 6, for (NH 4 ) 3 VOF 5 and (NH 4 ) 3 VO 2 F 4 , respectively] with similar unit-cell parameters and two independent vanadium atoms. Above RT [at 350 and 440 K for (NH 4 ) 3 VOF 5 and (NH 4 ) 3 VO 2 F 4 , respectively], the compounds undergo reversible phase transitions into high-symmetry dynamically disordered elpasolite-like (Fm " 3 3m, Z = 4) structures with six and 12 spatial orientations of the vanadium octahedron for (NH 4 ) 3 VOF 5 and (NH 4 ) 3 VO 2 F 4 , respectively. The ligand atoms are distributed in a mixed (split) position of 24e + 96j, one of the ammonium groups is disordered on the tetrahedron 32f site, but another one forms eight spatial orientations due to disorder of its hydrogen atoms in the 96j position. DSM and spectroscopic data enable the phase transition from high temperature to room temperature to be connected with the transition from isotropic orientations of the octahedron to its two different dynamic states.

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Syntheses and characterization of elpasolite-type ammonium alkali metal hexafluorometallates(III)

Cited by 20 publications

References 27 publications

Rational Design of (NH₄)Cu[PO₄] with a Spin Gapped, Distorted Honeycomb Layer

Rational Design of (NH₄)Cu[PO₄] with a Spin Gapped, Distorted Honeycomb Layer

Synthesis and crystal structure of a new open-framework iron phosphate (NH4)4Fe3(OH)2F2[H3(PO4)4]: Novel linear trimer of corner-sharing Fe(III) octahedra

Orientational disorder and phase transitions in ammonium oxofluorovanadates, (NH₄)₃VOF₅ and (NH₄)₃VO₂F₄

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Syntheses and characterization of elpasolite-type ammonium alkali metal hexafluorometallates(III)

Cited by 20 publications

References 27 publications

Rational Design of (NH4)Cu[PO4] with a Spin Gapped, Distorted Honeycomb Layer

Rational Design of (NH4)Cu[PO4] with a Spin Gapped, Distorted Honeycomb Layer

Synthesis and crystal structure of a new open-framework iron phosphate (NH4)4Fe3(OH)2F2[H3(PO4)4]: Novel linear trimer of corner-sharing Fe(III) octahedra

Orientational disorder and phase transitions in ammonium oxofluorovanadates, (NH4)3VOF5 and (NH4)3VO2F4

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Rational Design of (NH₄)Cu[PO₄] with a Spin Gapped, Distorted Honeycomb Layer

Rational Design of (NH₄)Cu[PO₄] with a Spin Gapped, Distorted Honeycomb Layer

Orientational disorder and phase transitions in ammonium oxofluorovanadates, (NH₄)₃VOF₅ and (NH₄)₃VO₂F₄