Zinc diphosphide


Zinc diphosphide
  • 12037-79-5
3D model (JSmol)
  • Interactive image
  • 141421
EC Number
  • 234-867-3
  • InChI=1S/P2.Zn/c1-2;/q-2;+2
  • [P-]=[P-].[Zn+2]
Molar mass 127.33 g/mol
Appearance red crystals
Density 3.53 g/cm3
Melting point 1,040 °C (1,900 °F; 1,310 K)
Tetragonal, tP24
P41212, No. 92[1]
GHS labelling:
GHS02: FlammableGHS06: Toxic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Zinc diphosphide (ZnP2) is an inorganic chemical compound. It is a red semiconductor solid with a band gap of 2.1 eV.[2] It is one of the two compounds in the zinc-phosphorus system, the other being zinc phosphide (Zn3P2).

Synthesis and reactions

Zinc diphosphide can be prepared by the reaction of zinc with phosphorus.

Zn + 2 P → ZnP2


ZnP2 has a room-temperature tetragonal form that converts to a monoclinic form at around 990 °C.[3] In both of these forms, there are chains of P atoms, helical in the tetragonal, semi-spiral in the monoclinic.[4]

This compound is part of the Zn-Cd-P-As quaternary system and exhibit partial solid-solution with other binary compounds of the system.[5]


ZnP2, like Zn3P2, is highly toxic due to the release of phosphine gas when the material reacts with gastric acid.


  1. ^ Litvinchuk, A. P.; Valakh, M. Ya. (2020). "Raman and infrared phonons in tetragonal ZnP2 and CdP2 crystals: A density functional study". Journal of Physics: Condensed Matter. 32 (44): 445401. Bibcode:2020JPCM...32R5401L. doi:10.1088/1361-648X/aba720. PMID 32679574.
  2. ^ Hegyi, I. J.; Loebner, E. E.; Poor (Jr.), E. W.; White, J. G. (1963). "Two crystal forms of ZnP2, their preparation, structure, and optoelectronic properties". Journal of Physics and Chemistry of Solids. 24 (2): 333–337. Bibcode:1963JPCS...24..333H. doi:10.1016/0022-3697(63)90140-9.
  3. ^ Ghasemi, M.; Stutz, E. Z.; Escobar Steinvall, S.; Zamani, M.; Fontcuberta i Morral, A. (2019). "Thermodynamic re-assessment of the Zn–P binary system". Materialia. 6: 100301. doi:10.1016/j.mtla.2019.100301.
  4. ^ Hans Georg von Schnering and Wolfgang Hönle, 1994, Phosphides: Solid State Chemistry, Encyclopedia of Inorganic chemistry, Ed. R Bruce King, John Wiley and Sons, ISBN 0-471-93620-0
  5. ^ Trukhan, V. M.; Izotov, A. D.; Shoukavaya, T. V. (2014). "Compounds and solid solutions of the Zn-Cd-P-As system in semiconductor electronics". Inorganic Materials. 50 (9): 868–873. doi:10.1134/S0020168514090143. S2CID 94409384.