The crystal structure of the α-modification of p -nitrophenol near 90° K

The crystal structure of the a modification of p-nitrophenol near 90 °K has been determined by the use of partial three-dimensional data.The cell dimensions are a = 11.66,b = 8.78, c = 6.098A, fl= 107 ° 32'.The space group is P21/n and Z =4.The crystals contain chains of hydrogen-bonded molecules.The benzene ring is planar but the nitrogen and oxygen atoms are displaced from the benzene-ring plane by amounts varying from 0-03-0-07 /~.