para-Azoxyanisole
| para-Azoxyanisole | |
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1-methoxy-4-[(4-methoxyphenyl)-NNO-azoxy]benzene |
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Other names
p-Azoxyanisole |
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| Identifiers | |
| CAS number | 1562-94-3  |
| PubChem | 15277 |
| ChemSpider | 14542 |
| Jmol-3D images | Image 1 |
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| 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 |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| 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]
[edit] References
- ^ 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.
- ^ Liquid Gold: The Story of Liquid Crystal Displays and the Creation of an Industry, Joseph A. Castellano, ISBN 978-9812389565
