✍ Scribed by Joseph Wontcheu; Thomas Schleid
No coin nor oath required. For personal study only.
The colourless title compound Tb 2 Se 2 O 7 (ϵ Tb 2 O-[SeO 3 ] 2 , terbium(III) oxide oxoselenate(IV)) was obtained by reacting a mixture of Tb 4 O 7 , Tb and SeO 2 in a 3:2:14-molar ratio at 850 °C for seven days in an evacuated silica vessel as needle-shaped single crystals. It crystallizes tetragonally (space group: P4 2 /ncm, a ϭ 1064.57(8), c ϭ 521.56(4) pm, c/a ϭ 0.490, Z ϭ 4) and exhibits Tb 3ϩ cations in square-antiprismatic coordination of eight oxygen atoms each. Six of the latter belong to six different isolated ψ 1tetrahedral [SeO 3 ] 2Ϫ anions whereas the remaining two are not bonded to selenium at all. Their coordination sphere actually consists of four Tb 3ϩ cations arranged as tetrahedron. These [OTb 4 ] 10ϩ tetrahedra form infinite one-dimensional 1 ϱ {[OTb 4/2 ] 4ϩ } chains along [001] by sharing trans-oriented edges which are packed such Tb 2 Se 2 O 7 : Terbium(III)-Oxid-Oxoselenat(IV) gemäß Tb 2 O[SeO 3 ] 2 mit einer Kanalstruktur aus nicht-bindenden Elektronenpaaren Inhaltsübersicht. Die farblose Titelverbindung Tb 2 Se 2 O 7 (ϵ Tb 2 O-[SeO 3 ] 2 , Terbium(III)-Oxid-Oxoselenat(IV)) wurde durch die Umsetzung eines Gemenges Tb 4 O 7 , Tb und SeO 2 im molaren Verhältnis 3:2:14 in evakuierten Quarzglasampullen innerhalb von sieben Tagen bei 850 °C in Form von nadelförmigen Einkristallen erhalten. Sie kristallisiert tetragonal (Raumgruppe: P4 2 /ncm; a ϭ 1064,57(8), c ϭ 521,56(4) pm, c/a ϭ 0,490; Z ϭ 4) und enthält Tb 3ϩ -Kationen in quadratisch-antiprismatischer Koordination von acht Sauerstoffatomen.
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