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The compound Ba3ThSe3(Se2)2 has been synthesized by solid-state methods at 1173K. Its crystal structure features one-dimensional chains of 1∞[Th(Se)3(Se2)26−] separated by Ba2+ cations. Each Th atom in these chains is coordinated to two Se–Se single-bonded pairs and four Se atoms to give rise to a pseudooctahedral geometry around Th. The Th–Se distances are consistent with Th4+ and hence charge balance...
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