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Crystals 2012, 2(3), 1136-1145; doi:10.3390/cryst2031136
Article

The Short Series of the Oxygen-Poor Lanthanide Oxide Selenides M10OSe14 with M = La–Nd

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,
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 and *
Institute for Inorganic Chemistry, University of Stuttgart, Pfaffenwaldring 55, Stuttgart D-70569, Germany
* Author to whom correspondence should be addressed.
Received: 6 June 2012 / Revised: 6 July 2012 / Accepted: 17 July 2012 / Published: 16 August 2012
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Abstract

Single crystals and phase pure samples of oxygen-poor ternary lanthanide oxide selenides with the composition M10OSe14 (M = La–Nd; tetragonal, I41/acd; a = 1592.0–1559.8 pm, c = 2106.5–2062.9 pm) could be obtained by reacting the corresponding metals, selenium and selenium dioxide as oxygen source. Their crystal structures are isotypic with Pr10OS14 and thus contain isolated [OM4]10+ tetrahedra (d(O2–M3+) = 243–248 pm) embedded in a complex anionic {[M6Se14]10–} lanthanide selenide matrix (d(M3+–Se2–) = 288–358 pm). All three crystallographically independent M3+ cations exhibit eight contacts to chalcogenide anions (O2– and/or Se2–) resulting in the formation of bicapped trigonal prismatic coordination polyhedra. The optical band gaps of the oxide selenides M10OSe14 amount to values between 1.89 and 2.04 eV indicating wide band-gap semiconductors.
Keywords: lanthanides; oxide selenides; crystal structures; band gaps; synthesis lanthanides; oxide selenides; crystal structures; band gaps; synthesis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Weber, F.A.; Schurz, C.M.; Frunder, S.; Kuhn, C.F.; Schleid, T. The Short Series of the Oxygen-Poor Lanthanide Oxide Selenides M10OSe14 with M = La–Nd. Crystals 2012, 2, 1136-1145.

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