para-Azoxyanisole (PAA) is an organic, aromatic compound. Its chemical formula is C₁₄H₁₄N₂O₃. In a solid state, it appears as a white powder, but when heated it forms a liquid crystal. As one of the first known and most readily prepared liquid crystals,^[1] PAA has played an important role in the development of liquid crystal displays.^[2]

Quick Facts Names, Identifiers ...

para-Azoxyanisole

Names
IUPAC name 1-Methoxy-4-[(4-methoxyphenyl)-NNO-azoxy]benzene
Other names p-Azoxyanisole
Identifiers
CAS Number	1562-94-3 Y
3D model (JSmol)	Interactive image
ChemSpider	14542 Y
PubChem CID	15277
UNII	4G08S4XUIX Y
InChI InChI=1S/C14H14N2O3/c1-18-13-7-3-11(4-8-13)15-16(17)12-5-9-14(19-2)10-6-12/h3-10H,1-2H3/b16-15- Y Key: KAEZRSFWWCTVNP-NXVVXOECSA-N Y InChI=1/C14H14N2O3/c1-18-13-7-3-11(4-8-13)15-16(17)12-5-9-14(19-2)10-6-12/h3-10H,1-2H3/b16-15- Key: KAEZRSFWWCTVNP-NXVVXOECBU
SMILES COc2ccc(\N=[N+](/[O-])c1ccc(OC)cc1)cc2
Properties
Chemical formula	C14H14N2O3
Molar mass	258.277 g·mol−1
Density	1.14 g/cm3
Melting point	114.9 °C (238.8 °F; 388.0 K)
Boiling point	417.9 °C (784.2 °F; 691.0 K) at 760 mmHg[dubious – discuss][citation needed]
Hazards
Flash point	206.6 °C (403.9 °F; 479.8 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

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Its liquid crystal range is from 118 °C to 136 °C. The solid to nematic transition is at 118 °C and the nematic to isotropic liquid transition at 136 °C.^[1]