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- W1992365787 abstract "Thorium undecaphosphide (Th2P11) is the first polyphosphide of a tetravalent cation (M) with a ratio P/M greater than 2. The compound was synthesized from the elements at 770 K. The black crystals decompose to Th3P4 at 740 K in vacuo. Th2P11 is a diamagnetic semiconductor with Eg = 0.3 eV and ρ (298) = 5392 Ω cm. The compound was found by single-crystal methods to crystallize in the monoclinic space group solP21c with a = 1738.4 pm, b = 1010.4 pm, c = 1919.3 pm, β = 117.62° andZ = 12 (4053 reflections hkl; R = 0.061). Th2Pn possesses a structure with puckered polyanionic layers formed by parallel oriented 1∞ [P16] bands with isolated P6 rings between them. The 1∞ [P16] bands are built up by the condensation of skewboat P6 rings and endo P8 rings. The thorium atoms are inserted in channels and have a ninefold coordination. The isolated P6 rings act as doubly tridentate ligands. A one-dimensional superstructure exists along the a axis. This results from a periodic sequence of open and closed P6 rings. The superstructure is discussed in terms of a valence-governed periodic modulation which is caused by a frozen-in SN2 reaction accompanied by a charge transfer." @default.
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- W1992365787 title "Dithorium undecaphosphide Th2P11, a polyphosphide with a one-dimensional superstructure generated by a periodic change in the covalent bonds" @default.
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- W1992365787 doi "https://doi.org/10.1016/0022-5088(80)90024-7" @default.
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