10.1021/ic951641b.s001
Jason A. Cody
Jason A.
Cody
James A. Ibers
James A.
Ibers
Synthesis and Structure of the Layered Thorium Telluride CsTh<sub>2</sub>Te<sub>6</sub>
American Chemical Society
1996
formula units
113 K
UTe 2
crystallographically equivalent sites
ThTe 8
compound crystallizes
reactive flux
semiconducting behavior
Te atoms
space group
Simple formalisms
CsTh 2 Te 6
oxidation state
Layered Thorium Telluride CsTh 2 Te 6
compound CsTh 2 Te 6
1996-06-19 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Synthesis_and_Structure_of_the_Layered_Thorium_Telluride_CsTh_sub_2_sub_Te_sub_6_sub_/3615327
The compound CsTh<sub>2</sub>Te<sub>6</sub> has
been synthesized at 800 °C by the reaction of Th with a
Cs<sub>2</sub>Te<sub>3</sub>/Te melt as a
reactive flux. The compound crystallizes in the space group
-<i>Cmcm</i> of
the orthorhombic system with two
formula units in a cell of dimensions <i>a</i> = 4.367(2)
Å, <i>b</i> = 25.119(10) Å, <i>c</i> = 6.140(3)
Å, and <i>V</i> = 673.5(5) Å<sup>3</sup>
at <i>T</i> = 113 K. The structure of
CsTh<sub>2</sub>Te<sub>6</sub> has been determined from
single-crystal X-ray data. The structure
comprises infinite, two-dimensional double layers of
ThTe<sub>8</sub>-bicapped trigonal prisms. The structural motif
of the
trigonal prisms resembles that found in UTe<sub>2</sub>.
Cs<sup>+</sup> cations, disordered equally over two
crystallographically
equivalent sites, separate the layers and are coordinated by eight Te
atoms at the corners of a rectangular
parallelepiped. Short Te−Te distances of 3.052(3) and
3.088(3) Å form linear, infinite, one-dimensional
chains
within the layers. Simple formalisms describe neither the Te−Te
bonding in the chain nor the oxidation state of
Th. The compound shows weak semiconducting behavior along the
Th/Te layers perpendicular to the Te−Te
chain.