Arsenic compounds: diarsenic triselenide

arsenic symbol icon

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

Crystal structure of diarsenic triselenide

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.

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arsenic atomic number