para-Azoxyanisole

para-Azoxyanisole
IUPAC name 1-methoxy-4-[(4-methoxyphenyl)-NNO-azoxy]benzene
Other names p-Azoxyanisole
Identifiers
CAS number	1562-94-3
PubChem	15277
ChemSpider	14542 Y
Jmol-3D images	Image 1
SMILES COc2ccc(\N=[N+](/[O-])c1ccc(OC)cc1)cc2
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
Properties
Molecular formula	C14H14N2O3
Molar mass	258.27 g/mol
Density	1.14g/cm3
Melting point	114.9 °C, 388 K, 239 °F
Boiling point	417.9°C @ 760mmHg
Hazards
Flash point	206.6°C
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

para-Azoxyanisole (PAA) is an organic, aromatic compound. 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 been played an important role in the development of liquid crystal displays.^[2]

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]

References

1. ^ ^{a b} Shao, Y.; Zerda, T. W. (1998). "Phase Transitions of Liquid Crystal PAA in Confined Geometries". Journal of Physical Chemistry B 102 (18): 3387–3394. doi:10.1021/jp9734437. 
2. ^ Liquid Gold: The Story of Liquid Crystal Displays and the Creation of an Industry, Joseph A. Castellano, ISBN 978-9812389565