A new polymorph of SrS
3 was obtained by a reaction of SrS and S with an atomic ratio of Sr:S = 1:5 under apressure of 5 GPa at 1200
![](/images/entities/deg.gif)
C. It crystallized in a tetragonal unit cell with
a = 6.708(1) Å,
c = 3.942(1) Å, and
V = 177.36(6) Å
3. It was isotypic with BaS
3, and contained S
32- polysulfide ions. The product obtained from thehigh-pressure synthesis contained an amorphous component. It was highly deliquescent and formed a yellowishsolution. A new layered polysulfide, Sr
2(OH)
2S
4·10H
2O, crystallized in the solution. The sulfide belonged to a triclinicspace group of
P![](/images/entities/onemacr.gif)
(No. 2) with lattice constants of
a = 5.9107(5) Å,
b = 7.8682(6) Å,
c = 9.
4134(6) Å,
![](/images/gifchars/alpha.gif)
=75.639(6)
![](/images/entities/deg.gif)
,
![](/images/gifchars/beta2.gif)
= 73.824(3)
![](/images/entities/deg.gif)
,
![](/images/gifchars/gamma.gif)
= 71.639(3)
![](/images/entities/deg.gif)
,
V = 392.83(5) Å
3, and
Z = 1. Each Sr ion was coordinated with oneOH ligand and eight H
2O ligands. Six H
2O ligands out of the eight were bridging ligands to form two-dimensional[Sr
2(OH)
2(H
2O)
102+]
![](/images/entities/infin.gif)
cationic layers, between which S
42- tetrapolysulfide ions were situated. The S
42- anion hada coplanar configuration with a dihedral angle of 180.0
![](/images/entities/deg.gif)
. The stability of S
42- anions having different conformationswas discussed from a viewpoint of ab initio MO calculations on changing the dihedral angles of S
42-.