Abstract
beta-NH4AlF4 has been synthesised ionothermally using 1-ethyl-3-methylimidazolium hexafluorophosphate as solvent and template provider. beta-NH4AlF4 crystals were produced which were suitable for single crystal X-ray diffraction analysis. A phase transition occurs between room temperature (298 K) and low temperature (93 K) data collections. At 298 K the space group = I4/mcm (no. 140), alpha = 11.642(5), c = 12.661(5) angstrom, Z = 2 (10NH(4)AlF(4)), wR(F-2) = 0.1278, R(F) = 0.0453. At 93 K the space group = P4(2)/ncm (no. 138), alpha = 11.616(3), c = 12.677(3) angstrom, Z = 2 (10NH(4)AlF(4)), wR(F-2) = 0.1387, R(F) = 0.0443. The single crystal X-ray diffraction study of beta-NH4AlF4 shows the presence of two different polymorphs at low and room temperature, indicative of a phase transition. The [AlF4/2F2](-) layers are undisturbed except for a small tilting of the AlF6 octahedra in the c-axis direction. (c) 2006 Elsevier Inc. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 49-53 |
| Number of pages | 5 |
| Journal | Journal of Solid State Chemistry |
| Volume | 180 |
| DOIs | |
| Publication status | Published - Jan 2007 |
Keywords
- Ionothermal
- beta-NH4AlF4
- X-ray diffraction
- 1-ethyl-3-methylimidazolium hexafluorophosphate
- DOUBLE 4-RING UNITS
- IONIC LIQUIDS
- FLUORIDE IONS
- PHYSICOCHEMICAL PROPERTIES
- ZEOLITE SYNTHESIS
- ALUMINOPHOSPHATE
- FRAMEWORKS
- SOLVENT
- MIXTURES
- TEMPLATE