The title compound with heteratomic anionic chains
![](/isubscribe/journals/inocaj/40/i12/eqn/ic001<font color=)
4134e10002.gif">[Tl
4Sb
612-] has been discovered in the K-Tl-Sb system.The phase is obtained from a range of compositions near K
3TlSb
1.5 following reaction first at 750-850
![](/images/entities/deg.gif)
C andthen at 550
![](/images/entities/deg.gif)
C for one week or more. It crystallizes in the monoclinic system in space group
C2/
c,
Z = 8,
a =9.951(1) Å,
b = 17.137(3) Å,
c = 19.640(6) Å, and
![](/images/gifchars/beta2.gif)
= 104.26(3)
![](/images/entities/deg.gif)
. Swing-like (Tl
4Sb
6)
12- units consisting ofalternating Sb and Tl atoms in four- and eight-membered rings are linked through Tl-Tl bonds to form infiniteone-dimensional chains along
![](/images/entities/avector.gif)
. EHTB calculations and resistivity measurements show that the compound is asemiconductor.