STUDY OF THE CRYSTALS OF P-NITROANIUNE AND P-NITROTOLUENE BY THE X-RAY SINGLE CRYSTAL ROTATION METHOD.

From the rotation photographs taken about the three crystallographic axes of single crystals of the two substances, the following dimensions of the unit cell were determined :$p$-Nitroanitine (15:31Å, 6.085Å,8.36Å ; $\beta$ = 126°11°) $p$-nitrotolaene (6.41Å,14.10Å,15.39Å). A large number of planes were identified on oscillation photographs and the halvings showed that the first crystal belongs to the space group $C_2^{5}h$. and the second to $Q_h^5$.