Sulfur monoxide

Structural formula
General
Surname	Sulfur monoxide
other names	Sulfur (II) oxide
Molecular formula	SO
Brief description	colorless gas
External identifiers / databases
CAS number 13827-32-2 PubChem 114845 Wikidata Q3245422
properties
Molar mass	48.06 g mol −1
Physical state	gaseous
Dipole moment	1.55 (2) D (5.2 x 10 -30  C  ·  m )
safety instructions
GHS hazard labeling no classification available
Thermodynamic properties
ΔH f 0	6.3 kJ / mol
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Sulfur monoxide is an inorganic chemical compound of sulfur from the group of oxides .

Extraction and presentation

Sulfur monoxide can be obtained by reacting sulfur with sulfur dioxide in an electrical discharge.

${\displaystyle \mathrm {S+SO_{2}\longrightarrow 2\ SO} }$

It can also be represented by burning sulfur in pure oxygen at reduced pressure.

${\displaystyle \mathrm {S_{2}+O_{2}\longrightarrow 2\ SO} }$

properties

Sulfur monoxide is a colorless, unstable gas. It is only stable at low pressures (<1 mbar). At higher pressures or when condensing with liquid air, orange-red to cherry-red plastic products are formed which, when heated, disproportionate to yellow polysulfur oxides with elimination of sulfur dioxide.

${\displaystyle (n+x)\;\mathrm {SO} \longrightarrow \mathrm {S} _{n}\mathrm {O} _{n-x}+x\;\mathrm {SO} _{2}}$

Sulfur monoxide is a highly reactive molecule that, like oxygen, has a triplet ground state.

Individual evidence

1. ^ ^{A b} Wilhelm Klemm, Rudolf Hoppe: Inorganic Chemistry . Walter de Gruyter, 1980, ISBN 3-11-007950-X , p. 111 ( limited preview in Google Book search).
2. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Dipole Moments, pp. 9-52.
3. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
4. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-16.
5. ^ ^{A b c} Egon Wiberg: Textbook of Inorganic Chemistry: With an appendix: History of chemistry . Walter de Gruyter, 1960, ISBN 3-11-023832-2 , p. 201 ( limited preview in Google Book search).
6. ↑ Ralf Steudel : Chemistry of Non-Metals: From Structure and Bond to Application . Walter de Gruyter, 2008, ISBN 3-11-021128-9 , p. 117 ( limited preview in Google Book search).