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 $S_8$
- Formula
- $S_8$
- Chemical formula
- S8
- Structural formula
- [S1][S][S][S][S][S][S][S1]
- Charge
- 0
- Unpaired electrons
- 0
- 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. $-S-S-$ $A_{1}$ no 475.0 inactive active ia Raman: 475 $cm^{-1}$ (solution, s) - with $\nu_7$ V2 bending $-S-S-S-$ $A_{1}$ no 218.0 inactive active ia Raman: 218 $cm^{-1}$ (solution, s) V3 stretching asym. $-S-S-$ $B_{1}$ no 411.0 inactive inactive ia V4 bending in-p $-S-S-S-$ $B_{2}$ no 243.0 243.0 active inactive s in solution V5 stretching $-S-S-S-S-S-S-S-S-$ ring $E_{1}$ double 471.0 471.0 active inactive m in solution V6 deformation $-S-S-S-S-S-S-S-S-$ ring $E_{1}$ double 191.0 191.0 active inactive s in solution V7 stretching asym. $-S-S-$ $E_{2}$ double 475.0 inactive active ia Raman: 475 $cm^{-1}$ (solution, s) - with $\nu_1$ V8 deformation $-S-S-S-$ $E_{2}$ double 152.0 inactive active Raman: 152 $cm^{-1}$ (solution, s) V9 bending asym. out-p (twisting) $-S-S-S-S-S-S-S-S-$ ring $E_{2}$ double 56.0 inactive active Raman: 86 $cm^{-1}$ (solution) - fundamental frequency from theory V10 stretching $-S-S-S-S-S-S-S-S-$ ring $E_{3}$ double 437.0 inactive active Raman: 437 $cm^{-1}$ (solution, s) V11 deformation $-S-S-S-S-S-S-S-S-$ ring $E_{3}$ double 248.0 inactive active Raman: 437 $cm^{-1}$ (solution, s) - Comments
- some modes to be confirmed! - Vibrations of the main isotope: $^{32}S_8$. Data from Scott and McCullough (1964)
- Publications