The crystal chemistry of doyleite, Al(OH)3
Abstract
The structure of doyleite, a rare polymorph of Al(OH)3, has been determined by a three-dimensional single-crystal diffraction study as triclinic, space group P[unk], a = 4.9997(8) Å, b = 5.1681(6) Å, c = 4.9832(6) Å, α = 97.444(10)°, β = 118.688(12)°, γ = 104.661(12)°, V = 104.39(3) Å3, Z = 2. Doyleite has a similar bilayer structure to the other modifications of Al(OH)3, comprising double layers of hcp O atoms with Al atoms occupying two-thirds of the octahedral interstices but is distinct from the other forms in its lateral displacement of adjacent layers and in aspects of the hydrogen bonding pattern. A good correspondence exists between the calculated structure and AFM images of doyleite's (010) surface. The OH-stretching Raman spectrum shows a single broad band centred near 3345 cm−1 with a weaker shoulder at 3615 cm−1 in some spectra. Intra-layer interactions between hydroxyl groups appear to involve limited, if any, bonding between a hydrogen and the next-nearest-neighbour oxygen and show no Raman scattering, in contrast to other Al(OH)3 polymorphs. The ∼100 cm−1 width of doyleite's OH-stretching band is taken as describing the time-averaged hydrogen bondstrength distribution throughout the crystal, with a continuous range of bond strengths consequential upon interchanging positional disorder of the hydrogen atoms and their varying involvement in interplane hydrogen bonds.
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Articles in the same Issue
- Al13Os4-type monoclinic phase and its orthorhombic variant in the Al–Co alloy system
- Connecting icosahedral and dodecagonal order
- A warning in indexing triclinic powder diffraction data
- A lithium molybdenum(V) monophosphate, Li3(MoO)2(PO4)3 structurally related to Li2Na(MoO)2(PO4)3
- Crystal structure of a cubic Al70Pd23Mn6Si; a 2/1 rational approximant of an icosahedral phase
- The crystal chemistry of doyleite, Al(OH)3
- Single crystal Mössbauer and neutron powder diffraction measurements on the synthetic clinopyroxene Li-acmite LiFeSi2O6
- New phases RCu5Sn (R=La, Ce, Pr, Nd, Sm, Gd) and Ce2Cu9Sn2.65
- The crystal structure of 2,3-dihydro-2,2,4-trimethyl-1H-1,5-benzodiazepinium perchlorate
- Structure of (E)-6,7,8,9-tetradeoxy-1,2:3,4-di-O-isopropylidene-7-nitro-α-D-galacto-non-6-eno-1,5-pyranose
- Crystal structure of guanidinium squarate dihydrate: C4O4 · 2C(NH2)3 · 2H2O
- Single crystal structure determination of cetylpyridiniumammonium bromide and Rietveld structure determination of cetylquinuclidinium bromide
- The modulated structure of 4-hydroxyphenyl 6-O-[(3R)-3,4-dihydroxy-2-methylenebutanoyl]-β-D-glucopyranoside, C17H22O10
