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ChemInform Abstract: Synthesis, Structure, and Properties of the Tetraarsenidometallates(V) M7(TAs4) (M: K, Rb; T: Nb, Ta).

✍ Scribed by J. NUSS; R. H. CARDOSO GIL; W. HOENLE; K. PETERS; H. G. VON SCHNERING

Publisher
John Wiley and Sons
Year
2010
Weight
30 KB
Volume
28
Category
Article
ISSN
0931-7597

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✦ Synopsis

1997 structure structure (solids and liquids) D 2000

10 -002

Synthesis, Structure, and Properties of the Tetraarsenidometallates(V) M7(TAs4) (M: K, Rb; T: Nb, Ta).

-The title compounds are prepared by reaction of MAs, M3As (M: K, Rb), and Nb or Ta at 1100 K (Nb or Ta tube, 24 h) and subsequent annealing at 870 K (48 h). Single crystal XRD data are reported for M7(NbAs4) and K7(TaAs4). The isotypic compounds crystallize in a new structure type, space group Pmn21, Z = 2. The structure contains polar-oriented ( NbAs4) or (TaAs4) tetrahedra. The As atoms have a trigonal prismatic coordination sphere. The trigonal prisms form alternating anionic 2. infin.(M4As2)2-and cationic 2∞(M3TAs2)2+ layers (M:

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