A new layered iron fluorophosphate

Choudhury, Amitava

doi:10.1007/bf02704302

Cited by 5 publications

(3 citation statements)

References 42 publications

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“…Both layers stack along the a -axis (Figure ). A similar but more complex layer separation has been observed in the crystal structure of another phosphate [C 6 N 4 H 21 ][Fe 2 F 2 (HPO 4 ) 3 ][H 2 PO 4 ]·2H 2 O with an organic countercation . The C 2 pyr cations are oriented practically orthogonal to the phosphate layers.…”

Section: Resultssupporting

confidence: 79%

“…A similar but more complex layer separation has been observed in the crystal structure of another phosphate [C 6 N 4 H 21 ][Fe 2 F 2 (HPO 4 ) 3 ][H 2 PO 4 ]·2H 2 O with an organic countercation. 60 The C 2 pyr cations are oriented practically orthogonal to the phosphate layers. Li cations in the cavities are tetrahedrally coordinated and also form pairs in form of edge-sharing LiO 4 tetrahedra ( Figure 3 b, blue).…”

Section: Resultsmentioning

confidence: 99%

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From a Dense Structure to Open Frameworks: The Structural Plethora of Alkali Metal Iron Fluorophosphates

et al. 2022

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By employing the pyridinium hexafluorophosphate task-specific ionic liquids 1-butyl-4-methylpyridinium hexafluorophosphate ([C 4 mpyr][PF 6 ]) and 1-ethylpyridinium hexafluorophosphate ([C 2 pyr][PF 6 ]) as the reaction medium, mineralizer, structure-directing agent, and, in the case of the smaller pyridinium cation, even a structural component, it was possible to obtain five new alkali metal iron phosphates featuring interconnected FeX 6 octahedra and PX 4 (X = F, O, or OH) tetrahedra. NaFe(PO 3 F) 2 ( 1 ) is a dense 3D structure, RbFe(PO 3 F)(PO 2 (OH)F)(PO 2 (OH) 2 ) ( 2 ) features 1D strands, (C 2 pyr)LiFe(PO 3 F) 3 (PO 2 F 2 )F ( 3 ) has 2D layers, and LiFe(PO 3 F)(PO 2 F 2 )F ( 4 ) as well as Cs 0.75 Fe(PO 2.75 (OH) 0.25 F)(PO 2 F 2 ) 2 ( 5 ) are 3D open frameworks. While in 1–2 as well as in 4 and 5 , FeX 6 octahedra and PX 4 (X = F, O, or OH) tetrahedra alternate, 3 features octahedra dimers, Fe 2 X 11 (X = F, O, or OH). The magnetic behavior of all compounds is governed by antiferromagnetic interactions. Interestingly, 3 exhibits a broad maximum in the temperature dependence of the magnetic susceptibility, characteristic of a low-dimensional magnetic system consistent with the presence of Fe–Fe dimers in its crystal structure.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

From a Dense Structure to Open Frameworks: The Structural Plethora of Alkali Metal Iron Fluorophosphates

et al. 2022

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“…Since then, other examples include a variety of titanium, yttrium, and rare earth silicates. − These materials have found applications in areas such as catalysis and ion exchange. , An example is the application of the ETS-10 titanosilicate in shape-selective photocatalytic degradation of large aromatic molecules. , In addition to the silicates, a range of metal phosphates have been prepared in which the metals are octahedrally coordinated. Ferey et al have synthesized a number of iron phosphates − and oxyfluorinated iron phosphates. − Several more iron phosphates have been produced. − Other mixed geometry frameworks include indium, − titanium, and nickel phosphates, illustrating the potential for incorporating a range of metal cations into microporous frameworks through hydrothermal synthesis.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis and Structural Characterization of Four Scandium Phosphate Frameworks

et al. 2003

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The recent expansion of zeolitic synthesis toward mixed geometry frameworks reflects their potential applications in shape-selective catalysis and absorption. Four scandium phosphates with three-dimensional frameworks have been hydrothermally synthesized. All structures were solved from single-crystal X-ray diffraction and were supported by 31P MAS NMR and infrared spectroscopy. Structure 1 ((C2N2H10)8Sc8(ScO2)4(PO4)4(HPO4)12·12H2O) consists of a novel framework with 14-membered rings (MRs) and 10-MR channels along the a and c axes, respectively. Ethylenediamine and water reside in the resulting supercage. Structure 2 ((C2N2H10)2Sc4(HPO4)8) consists of a framework built from the corner-sharing of ScO6 octahedra with HPO4 tetrahedra whose connection results in a 8-MR channel down the a axis, where hydrolyzed cyclam resides. This compound is isostructural to a number of existing synthetic materials including a scandium phosphate, an indium phosphate, and an iron phosphate. Structure 3 (Sc4(HPO4)8·4(H3O)) is a framework built in the same way as structure 2 but is described by a 12-MR channel down the a axis in which hydronium resides. This structure is isostructural to a ferric oxonium bis(hydrogenphosphate). Structure 4 (Sc4(PO4)4·8H2O) is a framework built by the corner-sharing of PO4 tetrahedra with ScO4·2H2O octahedra to form 8-MR channels down the a-axis. This structure occurs in nature as sterrettite, a scandium-bearing phosphate mineral, and has an isostructural indium phosphate. Crystal data: structure 1, P21/n, a = 8.603(2) Å, b = 15.476(3) Å, 16.504(4) Å, and β = 96.877(5)°, structure refinement converged at R = 0.0443; structure 2, P2/n, a = 9.4111(15) Å, b = 9.1066(15) Å, c = 9.6950(15) Å, and β = 117.272(3)°, structure refinement converged at R = 0.032; structure 3, P2/n, a = 5.3048(11) Å, b = 8.8230(18) Å, c = 14.779(3) Å, and β = 96.685(5)°, structure refinement converged at R = 0.0433; structure 4, P2(1)/n, a = 5.4429(8) Å, b = 10.2513(15) Å, c = 8.9094(11) Å, and β = 90.253(7)°, structure refinement converged at R = 0.063.

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