Diphosphorus

Diphosphorus
Names
	IUPAC name Diphosphorus
	Systematic IUPAC name Diphosphyne
Identifiers
CAS Number	12185-09-0 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:33472 ;
ChemSpider	4574176 ;
Gmelin Reference	1400241
PubChem CID	5460700;
	InChI InChI=1S/P2/c1-2 Key: FOBPTJZYDGNHLR-UHFFFAOYSA-N ; InChI=1/P2/c1-2 Key: FOBPTJZYDGNHLR-UHFFFAOYAU;
	SMILES P#P;
Properties
Chemical formula	P2
Molar mass	61.947523996 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Diphosphorus is an inorganic chemical with the chemical formula P
₂. Unlike nitrogen, its lighter pnictogen neighbor which forms a stable N₂ molecule with a nitrogen to nitrogen triple bond, phosphorus prefers a tetrahedral form P₄ because P-P pi-bonds are high in energy. Diphosphorus is, therefore, very reactive with a bond-dissociation energy (117 kcal/mol or 490 kJ/mol) half that of dinitrogen. The bond distance has been measured at 1.8934 Å.

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