Caesium phosphide

Caesium phosphide
Identifiers
3D model (JSmol)
  • [Cs].[Cs].[P].[P].[P].[P].[P]
Properties
Cs2P5
Molar mass 420.67971391 g·mol−1
Appearance yellow crystals
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Caesium phosphide is a binary inorganic compound of caesium metal and phosphorus with the chemical formula Cs2P5.[1]

Synthesis

Synthesis of caesium phosphide is by sintering of caesium with elemental phosphorus in vacuum:[2]

2Cs + 5P → Cs2P5

The effect of molten phosphorus on caesium hydride:

2CsH + 5P → Cs2P5 + H2↑

Physical properties

Caesium phosphide Cs3P7 forms yellow crystals of tetragonal structure (P41 group)[3], which turn brown when heated to 300 °C, and colorless when cooled with liquid nitrogen.

In an inert atmosphere (nitrogen), it melts at 650 °C with decomposition.

The compound dissolves in liquid ammonia.

Chemical properties

The compound reacts with water to release phosphine and hydrogen.[4]

References

  1. ^ Zayas, Hilda (1 December 2011). Spanish Chemical and Pharmaceutical Glossary: English-Spanish, Spanish-English. Taylor Trade Publications. p. 55. ISBN 978-1-58979-721-5. Retrieved 3 March 2024.
  2. ^ Samsonov, Gregory V. (6 December 2012). Handbook of the Physicochemical Properties of the Elements. Springer Science & Business Media. p. 781. ISBN 978-1-4684-6066-7. Retrieved 3 March 2024.
  3. ^ Tilley, Richard J. D. (14 August 2006). Crystals and Crystal Structures. John Wiley & Sons. p. 101. ISBN 978-0-470-02953-4. Retrieved 3 March 2024.
  4. ^ Bond, John (31 January 2017). Sources of Ignition: Flammability Characteristics of Chemicals and Products. Elsevier. p. 141. ISBN 978-1-4831-6125-9. Retrieved 3 March 2024.