Controllable solvothermal synthesis and photocatalytic properties of complex (oxy)fluorides K2TiOF4, K3TiOF5, K7Ti4O4F7 and K2TiF6

Sheng, Jie; Tang, Kaibin; Cheng, Wei; Wang, Junli; Yanxiang, Nie; Yang, Qing

doi:10.1016/j.jhazmat.2009.05.141

Cited by 18 publications

(14 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The existence of “Cs 2 Ti 2 F 10 ” has been claimed on the basis of its IR and Raman spectra . Concerning their use, studies showed that K 2 TiF 6 displays good photocatalytic performance, and a remarkable improvement in the hydrogen storage properties of NaAlH 4 upon introduction of K 2 TiF 6 as a catalyst precursor has also been also observed …”

Section: Introductionmentioning

confidence: 99%

“…The existence of "Cs 2 Ti 2 F 10 " has been claimed on the basis of its IR and Raman spectra. 27 Concerning their use, studies showed that K 2 TiF 6 displays good photocatalytic performance, 28 and a remarkable improvement in the hydrogen storage properties of NaAlH 4 upon introduction of K 2 TiF 6 as a catalyst precursor has also been also observed. 29 The possibility of incorporation of HF into a crystal structure by its coordination to metal centers and/or to fluorinated anions is known, 30 and it was recently observed in the alkali metal fluoridotitanate(IV) compounds K 2 (HF)TiF 6 , 31 K 4 [Ti 8 F 36 ]•8HF, 13 and Rb 4 [Ti 8 F 36 ]•6HF.…”

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Increasing Structural Dimensionality of Alkali Metal Fluoridotitanates(IV)

2018

View full text Add to dashboard Cite

Reactions between AF (A = Li, Na, K, Rb, Cs) and TiF (with starting n(AF):n(TiF) molar ratios in the range from 3:1 to 1:3) in anhydrous hydrogen fluoride yield [TiF], [TiF], [TiF], [TiF], and [TiF] salts. With the exception of the ATiF compounds, which consist of A cations and octahedral [TiF] anions, all of these materials arise from the condensation of TiF units. The anionic part in the crystal structures of A[TiF] (A = K, Cs) and A[TiF]·HF (A = Na, K, Rb) is composed of infinite ([TiF]) chains built of TiF octahedra sharing joint vertices. Each structure shows a slightly different geometry of the ([TiF]) chains. The crystal structure of Na[TiF]·HF is constructed from polymeric ([TiF]) anions that appear as two parallel infinite zigzag chains comprising TiF units, where each TiF unit of one chain is connected to a TiF unit of the other chain through a shared fluorine vertex. Slow decomposition of single crystals of K[TiF]·8HF and Rb[TiF]·6HF ( Shlyapnikov , I. M. ; et al. Chem. Commun. 2013 , 49 , 2703 ) leads to the formation of [TiF] (Rb) and [TiF] (K, Rb) salts. The former displays the same ([TiF]) double chain as in Na[TiF]·HF, while the anionic part in the latter, ([TiF]), represents the first example of a three-dimensional network built of TiF octahedra. The ([TiF]) anion was also found in [HO][TiF]. The crystal structure determination of Cs[TiF] revealed a new type of polymeric fluoridotitanate(IV) anion, ([TiF]). Similar to the ([TiF]) anion, it is also built of zigzag double chains comprising TiF units. However, in the former there are fewer connections between TiF units of two neighboring chains than in the latter.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Increasing Structural Dimensionality of Alkali Metal Fluoridotitanates(IV)

2018

View full text Add to dashboard Cite

show abstract

“…These features make it an ideal material to better understand the role of countercation–ligand bonding preferences on the [TiOF 5 ] 3– orientational order. The metric shape of the cell has been indexed as a tetragonal unit cell at ambient conditions ( a = b = 6.102 Å, c = 8.655 Å). − However, we are unaware of any studies that refine the space group symmetry and internal ion coordinates or assess whether K 3 TiOF 5 is inversion symmetric. For the measured lattice constants, there are three simple arrangements of the ions consistent with the cryolite structure (Figure ).…”

Section: Introductionmentioning

confidence: 99%

Perovskite-like K₃TiOF₅ Exhibits (3 + 1)-Dimensional Commensurate Structure Induced by Octahedrally Coordinated Potassium Ions

et al. 2021

View full text Add to dashboard Cite

Elpasolite-and cryolite-type oxyfluorides can be regarded as superstructures of perovskite and exhibit structural diversity. While maintaining a similar structural topology with the prototype structures, changes in the size, electronegativity, and charge of cation and/or anion inevitably lead to structural evolution. Therefore, the nominal one-toone relation suggested by a doubled formula of perovskite does not guarantee a simple 2-fold superstructure for many cases. Herein, the commensurately modulated perovskite-like K 3 TiOF 5 was refined at 100 K from single-crystal X-ray diffraction data by using a pseudotetragonal subcell with lattice parameters of a = b = 6.066(2) Å and c = 8.628(2) Å. The length of the modulation vector was refined to 0.3a* + 0.1b* + 0.25c*. In the commensurate supercell of K 3 TiOF 5 , the B-site Ti 4+ and K + cations in [TiOF 5 ] 3− and [KOF 5 ] 6− octahedral units were found to be significantly displaced from the average atomic positions refined in the subcell. The displacements of the K + cations are ±0.76 Å, and those for the Ti 4+ cations are approximately ±0.13 Å. One-and two-dimensional solid-state 19 F NMR measurements revealed two tightly clustered groups of resonances in a ratio of ca. 4:1, assigned to equatorial and axial fluorine, respectively, consistent with local [TiOF 5 ] 3− units. S/TEM results confirmed the average structure. Electronic structure calculations of the idealized I4mm subcell indicate the instability to a modulated structure arises from soft optical modes that is controlled by the octahedrally coordinated B-site potassium ions in the cryolite-type structure.

show abstract

“…Some studies described fluorine containing compounds as superconductors, dielectrics, and piezoelectrics [1][2][3][4][5][6]. Materials with high magnetic resistance and catalytic and photocata lytic properties are known [7][8][9]. However, today studies of the transport properties of perovskite like oxyfluorides are scanty.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, hydration, and electrical properties of oxyfluoride Ba2InO3F

Tarasova

Анимица

2015

Russ J Electrochem

View full text Add to dashboard Cite

show abstract

Controllable solvothermal synthesis and photocatalytic properties of complex (oxy)fluorides K2TiOF4, K3TiOF5, K7Ti4O4F7 and K2TiF6

Cited by 18 publications

References 50 publications

Increasing Structural Dimensionality of Alkali Metal Fluoridotitanates(IV)

Increasing Structural Dimensionality of Alkali Metal Fluoridotitanates(IV)

Perovskite-like K₃TiOF₅ Exhibits (3 + 1)-Dimensional Commensurate Structure Induced by Octahedrally Coordinated Potassium Ions

Synthesis, hydration, and electrical properties of oxyfluoride Ba2InO3F

Contact Info

Product

Resources

About

Controllable solvothermal synthesis and photocatalytic properties of complex (oxy)fluorides K2TiOF4, K3TiOF5, K7Ti4O4F7 and K2TiF6

Cited by 18 publications

References 50 publications

Increasing Structural Dimensionality of Alkali Metal Fluoridotitanates(IV)

Increasing Structural Dimensionality of Alkali Metal Fluoridotitanates(IV)

Perovskite-like K3TiOF5 Exhibits (3 + 1)-Dimensional Commensurate Structure Induced by Octahedrally Coordinated Potassium Ions

Synthesis, hydration, and electrical properties of oxyfluoride Ba2InO3F

Contact Info

Product

Resources

About

Perovskite-like K₃TiOF₅ Exhibits (3 + 1)-Dimensional Commensurate Structure Induced by Octahedrally Coordinated Potassium Ions