Molecule
Name
Octasulfur
IUPAC name
Octasulfur
Secondary names
Octasulphur, Cyclo-octasulfur, Cyclo-octasulphur, Octasulfur, Octathiocane, sulfur molecule, sulphur molecule, Sulfur octamer, Cyclic octaatomic sulfur, S8
InChI
InChI=1S/S8/c1-2-4-6-8-7-5-3-1
InChI key
JLQNHALFVCURHW-UHFFFAOYSA-N
CAS number
10544-50-0
Comments
natural S8
Formula
S8
Chemical formula
S8
Structural formula
[S1][S][S][S][S][S][S][S1]
Charge
0
Unpaired electrons
0
  Atom Name Number
S Sulfur 8
Relations
  • no
Isotope mixture type
terrestrial abundance
Spin type
unique
Spin quantum numbers
0
Molar mass
256.52 g/mol
State STP
solid
Protic
aprotic
Polarity
nonpolar
Dipole
0.0 D
Molecule symmetry
D4d
Case
nonlinear-polyatomic
Vibrations number
11
Vibrations
Label Mode Bond Symmetry Degeneracy Fundamental frequency Observed frequency Observed frequency Harmonic frequency Activity IR Activity Raman Strength Comments
V1 stretching sym. SS A1 no 475.0 inactive active ia Raman: 475 cm1 (solution, s) - with ν7
V2 bending SSS A1 no 218.0 inactive active ia Raman: 218 cm1 (solution, s)
V3 stretching asym. SS B1 no 411.0 inactive inactive ia
V4 bending in-p SSS B2 no 243.0 243.0 active inactive s in solution
V5 stretching SSSSSSSS ring E1 double 471.0 471.0 active inactive m in solution
V6 deformation SSSSSSSS ring E1 double 191.0 191.0 active inactive s in solution
V7 stretching asym. SS E2 double 475.0 inactive active ia Raman: 475 cm1 (solution, s) - with ν1
V8 deformation SSS E2 double 152.0 inactive active Raman: 152 cm1 (solution, s)
V9 bending asym. out-p (twisting) SSSSSSSS ring E2 double 56.0 inactive active Raman: 86 cm1 (solution) - fundamental frequency from theory
V10 stretching SSSSSSSS ring E3 double 437.0 inactive active Raman: 437 cm1 (solution, s)
V11 deformation SSSSSSSS ring E3 double 248.0 inactive active Raman: 437 cm1 (solution, s)
Comments
some modes to be confirmed! - Vibrations of the main isotope: 32S8. Data from Scott and McCullough (1964)
Publications
Chemical bonds
  Bond Number
SS 8