57521-42-3

Basic information

• Product Name: F₂NO
• Synonyms: F₂NO
• CAS NO: 57521-42-3
• Molecular Weight: 68.0029
• Mol File: 57521-42-3.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: F₂NO(CAS DataBase Reference)
• NIST Chemistry Reference: F₂NO(57521-42-3)
• EPA Substance Registry System: F₂NO(57521-42-3)

Safety Data

• Hazardous Substances Data: 57521-42-3(Hazardous Substances Data)

Upstream product

• 10102-43-9 nitrogen(II) oxide 
• 7782-41-4 fluorine 

Relevant articles and documents

Endothermic formation of a chemical bond by entropic stabilization: Difluoronitroxide radical in solid argon

Difluoronitroxide radical (F2NO) has been formed in solid argon matrices by successive addition of two diffusing F atoms to NO. This radical exists in dynamic equilibrium with a van der Waals complex (FFNO). Measurements of the equilibrium concentrations as a function of temperature show that the changes in enthalpy and the entropy associated with formation of the F2NO radical are ΔH = 1240 ± 180 J/mol and ΔS = 62 ± 10 J/(mol K). Because both these quantities are positive, the equilibrium favors F2NO only at elevated temperatures. This situation is a rare case in which formation of a chemical bond is stabilized only by an increase in the entropy of the system.