H-bonding scheme in allactite: a combined single-crystal X-ray and neutron diffraction, optical absorption spectroscopy, FTIR and EPMA-WDS study
Articolo
Data di Pubblicazione:
2016
Citazione:
H-bonding scheme in allactite: a combined single-crystal X-ray and neutron diffraction, optical absorption spectroscopy, FTIR and EPMA-WDS study / G.D. Gatta, F. Bosi, M.T. Fernandez Diaz, U. Hålenius. - In: MINERALOGICAL MAGAZINE. - ISSN 1471-8022. - 80:5(2016), pp. 719-732. [10.1180/minmag.2016.080.020]
Abstract:
The crystal chemistry of allactite from Langban, Varmland (Sweden) was investigated by single-crystal X-ray and neutron diffraction, optical absorption spectroscopy, Fourier-transform infra-red spectroscopy (FTIR) and electron microprobe analysis by wavelength-dispersive spectroscopy (EPMA-WDS). The optical spectra indicate the presence of Mn in valence state 2+ only. Assuming 16 O atoms per formula unit, arsenic as As5+ and the (OH) content calculated by charge balance, the resulting formula based on the EPMA-WDS data is (Mn6.732+Ca0.13Mg0.12Zn0.02)(Sigma 7.00)(As5+)(2.00)O16H8, very close to the ideal composition Mn-7(AsO4)(2)(OH)(8). In the unpolarized FTIR spectrum of allactite, fundamental (OH)-stretching bands are observed at 3236, 3288, 3387, 3446, 3484, 3562 and 3570 cm(-1), suggesting that a number of OH environments, with different hydrogen bond strengths, occur in the structure. The neutron structure refinement shows that four independent H sites occur in allactite with full site occupancy, all as members of hydroxyl groups. The complex hydrogen-bonding scheme in the allactite structure is now well defined, with at least nine hydrogen bonds energetically favourable with mono-, bi- and trifurcated configurations.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
allactite; arsenates; electron microprobe analysis; X-ray and neutron diffraction; optical absorption; infrared spectroscopy; hydrogen bonding
Elenco autori:
G.D. Gatta, F. Bosi, M.T. Fernandez Diaz, U. Hålenius
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