WebElements Periodic Table of the Elements | Arsenic

Arsenic compounds: diarsenic triselenide

The arsenic in diarsenic triselenide formally is in the oxidation state 3.

Diarsenic triselenide

Formula as often written: As₂Se₃
Hill system formula: As₂Se₃
CAS registry number: [1303-36-2]
Formula weight: 386.723
Class: selenide

Synonyms

diarsenic triselenide
arsenic(III) selenide
arsenic selenide

Physical properties

Colour: brown-black
Appearance: solid
Melting point: 260°C
Boiling point:
Density: 4750 kg m^-3

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Element analysis

Element percentages for the elements in diarsenic triselenide
Element	%
As	38.75
Se	61.25

Synthesis

Not available

Solid state structure

Geometry of arsenic:
Prototypical structure:

Crystal structure of diarsenic triselenide

Isotope pattern

What follows is the calculated isotope pattern for the As₂Se₃ unit with the most intense ion set to 100%.

Formula: As₂Se₃

mass  %
374   0.0 
375   0.0 
376   0.1 
377   0.0 
378   0.9 
379   0.1 
380   4.5 __
381   0.6 
382  15.8 ________
383   1.6 _
384  40.3 ____________________
385   2.7 _
386  76.2 ______________________________________
387   3.1 __
388 100.0 __________________________________________________
389   1.0 
390  88.2 ____________________________________________
391   0.1 
392  34.5 _________________
393   0.0 
394   5.9 ___
395   0.0 
396   0.4

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.