2005
Tantalum
I 5200
20- 024
New Layered Quaternary Tantalum Thiophosphates Containing Binuclear
[Ta2S10] Units: Synthesis and Crystal Structures of the New Compounds
K0.42TaPS 5 and Rb0.42TaPS5. — The two new quaternary tantalum thiophosphates of
title are prepared by reactions of Ta with an in situ formed polythiophosphate melt of
M2S3 (M: K, Rb), P2S5, and sulfur (500 °C, 4 d; 85% yield for M: K and 70% for M:
Rb). The isostructural compounds crystallize in the orthorhombic space group Fddd
with Z = 16 (single crystal XRD). The structure contains TaS6 octahedra sharing one
edge to form dimeric Ta2S10 units, which are linked by sharing common edges with four
tetradentate PS4 groups yielding a two-dimensional layered structure. The connection
scheme leads to the formation of one type of cavities within the layers which are occupied by the alkali metal cations. — (GUTZMANN, A.; NAETHER, C.; BENSCH*,
W.; Z. Anorg. Allg. Chem. 631 (2005) 2-3, 524-529; Inst. Anorg. Chem.,
Christian-Albrechts-Univ., D-24098 Kiel, Germany; Eng.) — Schramke