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

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

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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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 (CC BY 3.0).

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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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