o-Nitrobenzoic acid, NO2C6H4COOH, crystallized from aqueous alcohol mixture is triclinic, space group P I with a=7"55, b=4"99, c= 12.50/~; ~= 122.5 °, p= 95.3 °, r= 108.9°; ao (26°C), 1.567 g.cm-3; 0c for Z=2, 1.568 g.cm-3; u for Cu K~, 13.5 cm-1.The structure has been refined with the help of three-dimensional data and the molecular dimensions are compared with those of similar compounds. The effect of intramolecular overcrowding is to cause the exocyclic carbon atom and the nitrogen atom to be displaced out of the aromatic plane in opposite directions by 0.209 and 0.160/~ respectively; the C-C and C-N bonds are displaced sideways as well.The o-nitrobenzoic acid dimers are held in a stable structure by normal van der Waals interactions.

to the (100) plane and passing through the point (0,~,-~). The presence of the pseudo axis explains the occurrence of twinning in the crystals as well as the presence of diffuse streaks in some of the Weissenberg photographs.

No abstract

No abstract

No abstract