Strontium tristannide, SrSn3, shows a transition to
the superconducting state at 5.4 K and SrSn4 at 4.8 K.
SrSn3 crystallizes in the Mg3In-type, which consists of
distorted hexagonal layers with AB3 composition,
similar to the above structure. In addition, a Zintl
compound composed of SrSn3·SrSb4 has been synthesized
and its structure has been determined by singlecrystal
XRD methods. It crystallizes in the orthorhombic
space groupdPnma with a = 10.060 ? , b = 4.361 ? ,
c = 22.934 ? , and Z =4 at 22°C. The structure of
Sr2Sn3Sb4 may be described as consisting of large,
narrow channels running along [010] defined by 30-
membered rings constructed from an anionic framework
of linked SnSb4 tetrahedra, SnSb3 trigonal
pyramids, and zigzag Sb–Sb chains. Sr2+
cations are
situated within these channels.
