WebElements Periodic Table of the Elements | Selenium

Selenium compounds: selenium dioxide

The selenium in selenium dioxide formally is in the oxidation state 4.

Selenium dioxide

Formula as often written: SeO₂
Hill system formula: O₂Se₁
CAS registry number: [7446-08-4]
Formula weight: 110.959
Class: oxide

Synonyms

selenium dioxide
selenium(IV) oxide
selenium oxide

Physical properties

Colour: white
Appearance: crystalline solid
Melting point: 340°C
Boiling point: 315°C
Density: 3950 kg m^-3

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Element analysis

Element percentages for the elements in selenium dioxide
Element	%
O	28.84
Se	71.16

Synthesis

Selenium(IV) dioxide is formed by the combustion of elemental selenium in a mixture of oxygen and nitrogen dioxide. The yield is about 80%. Selenium(IV) dioxide is a white crystalline material that melts at 340°C.

Solid state structure

Geometry of selenium:
Prototypical structure:

Crystal structure of selenium dioxide

Isotope pattern

What follows is the calculated isotope pattern for the SeO₂ unit with the most intense ion set to 100%.

Formula: Se₁O₂

mass  %
106   1.8 _
107   0.0 
108  18.1 _________
109   1.5 _
110  47.5 ________________________
111   0.0 
112 100.0 __________________________________________________
113   0.1 
114  18.9 _________
115   0.0 
116   0.1

References

The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.

R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.