Molecule
Name
Disulfur monoxide
IUPAC name
Disulfur monoxide
Secondary names
Sulfur suboxide, Sulphur suboxide, Sulfuroxide, Sulphuroxide, S2O
InChI
InChI=1S/OS2/c1-3-2
InChI key
TXKMVPPZCYKFAC-UHFFFAOYSA-N
CAS number
20901-21-7
Comments
natural $S_2O$
Structure and atomic composition
Formula
$S_2O$
Chemical formula
S2O
Structural formula
S=S=O
Charge
0
Unpaired electrons
0
  Atom Name Number
$S$ Sulfur 2
$O$ Oxygen 1
Relations
  • no
Isotope mixture type
terrestrial abundance
Isotopes
  Isotope Mole fraction
$^{32}S_2^{16}O$ 0.90012
$^{32}S_2^{17}O$ 0.00034288
$^{32}S_2^{18}O$ 0.0018497
$^{32}S^{33}S^{16}O$ 0.0071069
$^{32}S^{34}S^{16}O$ 0.740273
$^{33}S^{32}S^{16}O$ 0.0071069
$^{33}S_2^{16}O$ 5.6113e-05
$^{33}S^{34}S^{16}O$ 0.00031798
$^{34}S^{32}S^{16}O$ 0.740273
$^{34}S^{32}S^{16}O$ 1.798e-05
$^{34}S_2^{16}O$ 0.0018019
Spin type
unique
Spin quantum numbers
0
Molar mass
80.1294 $g/mol$
State STP
gas
Protic
aprotic
Polarity
polar
Molecule symmetry
unknown
Case
nonlinear-triatomic
Vibrations number
3
Vibrations
Label Mode Bond Symmetry Degeneracy Fundamental frequency Observed frequency Observed frequency Harmonic frequency Activity IR Activity Raman Strength Comments
V1 stretching $=S=O$ $A_{}'$ no 1166.0 1166.45 active active
V2 bending $S_2O$ no 380.0 380.0 active active
V3 stretching $=S=S$ no 679.0 679.1 active active
Comments
Vibrations of the main isotope: $^{32}S_2^{16}O$. Data from NIST Chemistry WebBook
Chemical bonds
  Bond Number
$=S=O$ 1
$=S=S$ 1