Subtopic Deep Dive
Fluoride Crystal Structures
Research Guide
What is Fluoride Crystal Structures?
Fluoride crystal structures refer to the atomic arrangements in inorganic fluoride compounds and related oxyfluorides determined primarily by X-ray diffraction and NMR crystallography.
Researchers use powder X-ray diffraction, single-crystal X-ray analysis, and SMARTER crystallography to resolve structures like Zn3Al2F12·[HAmTAZ]6 (Martineau et al., 2012, 44 citations) and Te(N3)3SbF6 (Johnson et al., 1989, 44 citations). These studies cover MF3 fluorides, complex fluorides such as alkali hexafluoridorhenates (Louis–Jean et al., 2018, 12 citations), and hybrid materials. Over 10 key papers from 1989-2023 document polymorphism and phase transitions in these systems.
Why It Matters
Structural data from fluoride crystals guides materials design for nonlinear optics, as in antimony(III) fluoride oxalates with tunable birefringence (Zhang et al., 2022, 52 citations) and chiral tin fluorides (Jung et al., 2023, 14 citations). In catalysis and coordination chemistry, precise geometries of Nb/Ta fluoride complexes (Levason et al., 2014, 32 citations) inform reactivity predictions. Fluorine bonding motifs in oxyfluorides (Aldous and Lightfoot, 2012, 15 citations) underpin applications in fluoronium cations and high-performance materials.
Key Research Challenges
Resolving hybrid structures
Fluorinated inorganic-organic hybrids like Zn3Al2F12·[HAmTAZ]6 require combined powder XRD and NMR due to poor crystallinity (Martineau et al., 2012, 44 citations). SMARTER crystallography addresses this but demands multi-technique integration. Validation remains error-prone without chemical modeling.
Handling polymorphism
Many fluoride systems exhibit multiple phases, complicating single-crystal growth as in alkali hexafluoridorhenates (Louis–Jean et al., 2018, 12 citations). Phase transitions alter space groups like P2₁/c in BeF2(NH3)2 (Kraus et al., 2009, 29 citations). Temperature-dependent studies are resource-intensive.
Analyzing weak interactions
Cation-anion synergies in Sb(III) fluorides drive birefringence but require DFT beyond X-ray resolution (Zhang et al., 2022, 52 citations). Fluorine lone-pair effects in novel units challenge refinement (Aldous and Lightfoot, 2012, 15 citations). Computational verification lags experimental data.
Essential Papers
Cation-anion synergetic interactions achieving tunable birefringence in quasi-one-dimensional antimony(III) fluoride oxalates
Die Zhang, Qiang Wang, Ting Zheng et al. · 2022 · Science China Materials · 52 citations
SMARTER crystallography of the fluorinated inorganic–organic compound Zn3Al2F12·[HAmTAZ]6
Charlotte Martineau, Amandine Cadiau, Boris Bouchevreau et al. · 2012 · Dalton Transactions · 44 citations
We present in this paper the structure resolution of a fluorinated inorganic-organic compound--Zn(3)Al(2)F(12)·[HAmTAZ](6)--by SMARTER crystallography, i.e. by combining powder X-ray diffraction cr...
The preparation and X-ray crystal structure of Te(N<sub>3</sub>)<sub>3</sub>SbF<sub>6</sub> containing the triazidotellurium(IV) cation, Te(N<sub>3</sub>)<sub>3</sub><sup>+</sup>
J. P. Johnson, Gregory K. MacLean, Jack Passmore et al. · 1989 · Canadian Journal of Chemistry · 44 citations
The crystal structure of Te(N 3 ) 3 SbF 6 containing the first binary tellurium–nitrogen cation, triazidotellurium(IV) (Te(N 3 ) 3 + ), has been determined by X-ray crystallography. Single crystals...
Soft diphosphine and diarsine complexes of niobium(<scp>v</scp>) and tantalum(<scp>v</scp>) fluorides: synthesis, properties, structures and comparisons with the corresponding chlorides
William Levason, Mark E. Light, Gillian Reid et al. · 2014 · Dalton Transactions · 32 citations
The reactions of the soft diphosphines o-C6H4(PMe2)2, Me2P(CH2)2PMe2, Et2P(CH2)2PEt2 or o-C6H4(PPh2)2 with NbF5 or TaF5 in anhydrous MeCN solution produce [MF4(diphosphine)2][MF6] (M = Nb or Ta), w...
Beryllium Diammine Difluoride [BeF<sub>2</sub>(NH<sub>3</sub>)<sub>2</sub>]
Florian Kraus, Matthias B. Fichtl, Sebastian A. Baer · 2009 · Zeitschrift für Naturforschung B · 29 citations
Beryllium difluoride BeF 2 reacts with liquid ammonia forming discrete diammine difluoro beryllium( II) [BeF 2 (NH 3 ) 2 ] molecules. The colorless compound crystallizes in the monoclinic space gro...
New structural units in molybdenum oxyfluoride chemistry
D.W. Aldous, Philip Lightfoot · 2012 · Journal of Fluorine Chemistry · 15 citations
Structural proof of a [C–F–C]+ fluoronium cation
Kurt F. Hoffmann, Anja Wiesner, Carsten Müller et al. · 2021 · Nature Communications · 15 citations
Reading Guide
Foundational Papers
Start with Martineau et al. (2012, 44 citations) for SMARTER method on hybrids, Johnson et al. (1989, 44 citations) for early X-ray on cations, and Levason et al. (2014, 32 citations) for coordination fluorides—these establish core techniques and motifs.
Recent Advances
Study Zhang et al. (2022, 52 citations) for birefringence applications, Jung et al. (2023, 14 citations) for chiral designs, and Hoffmann et al. (2021, 15 citations) for fluoronium ions.
Core Methods
X-ray diffraction (single/powder) dominates, augmented by SMARTER/NMR (Martineau 2012), Raman (Louis–Jean 2018), and DFT for bonding (Zhang 2022).
How PapersFlow Helps You Research Fluoride Crystal Structures
Discover & Search
Research Agent uses searchPapers and exaSearch to find top-cited works like 'SMARTER crystallography of Zn3Al2F12·[HAmTAZ]6' (Martineau et al., 2012), then citationGraph reveals connections to Levason's Nb/Ta fluorides (2014) and Zhang's birefringent oxalates (2022). findSimilarPapers expands to oxyfluoride motifs from Aldous and Lightfoot (2012).
Analyze & Verify
Analysis Agent applies readPaperContent to extract space groups from Te(N3)3SbF6 (Johnson et al., 1989), then runPythonAnalysis with NumPy/pandas computes lattice parameter statistics across 10 papers. verifyResponse via CoVe cross-checks claims against GRADE evidence grading, flagging inconsistencies in [ReF6]2- distortions (Louis–Jean et al., 2018).
Synthesize & Write
Synthesis Agent detects gaps in polymorphism studies across MF3 fluorides, flags contradictions in F-bonding motifs, and generates exportMermaid diagrams of crystal packing. Writing Agent uses latexEditText for structure descriptions, latexSyncCitations to link Martineau (2012) and Kraus (2009), then latexCompile for publication-ready reports.
Use Cases
"Extract lattice parameters from BeF2(NH3)2 and compute volume using Python."
Research Agent → searchPapers('BeF2(NH3)2 crystal') → Analysis Agent → readPaperContent(Kraus 2009) → runPythonAnalysis('calculate unit cell volume from a=4.8815 b=6.8528 c=10 Å') → matplotlib plot of parameters.
"Write LaTeX section on SbF6 structures with citations."
Research Agent → citationGraph('Johnson 1989 Te(N3)3SbF6') → Synthesis Agent → gap detection → Writing Agent → latexEditText('Describe monoclinic P21 structure') → latexSyncCitations(Johnson, Louis–Jean) → latexCompile → PDF output.
"Find GitHub repos analyzing DFT on fluoride structures."
Research Agent → searchPapers('fluoride DFT crystal') → Code Discovery → paperExtractUrls(Zhang 2022) → paperFindGithubRepo → githubRepoInspect → runPythonAnalysis on repo scripts for birefringence models.
Automated Workflows
Deep Research workflow scans 50+ fluoride papers via searchPapers, structures a review by citation count, and outputs GRADE-graded reports on space groups. DeepScan's 7-step chain verifies [MF6] octahedra distortions (Levason 2014) with CoVe checkpoints and runPythonAnalysis for symmetry stats. Theorizer generates hypotheses on F···F interactions from Martineau (2012) and Aldous (2012) structures.
Frequently Asked Questions
What defines fluoride crystal structures?
Atomic arrangements in inorganic fluorides like MF3, [MF6], and oxyfluorides, resolved by X-ray diffraction revealing space groups such as P2₁/c (Kraus et al., 2009) or P¯3m1 (Louis–Jean et al., 2018).
What methods determine these structures?
Primary methods are single-crystal/powder X-ray diffraction, SMARTER crystallography combining NMR (Martineau et al., 2012), and Raman spectroscopy (Louis–Jean et al., 2018) for validation.
What are key papers?
Highest cited: Zhang et al. (2022, 52 citations) on birefringent Sb fluorides; Martineau et al. (2012, 44 citations) and Johnson et al. (1989, 44 citations) on hybrid and Te cations.
What open problems exist?
Challenges include modeling weak F-interactions beyond X-ray (Zhang 2022), resolving polymorphs in situ, and scaling DFT for complex oxyfluorides (Aldous 2012).
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