COLUMNAR STACKING OF 1,3-DIPHENYL-1,2,4-BENZOTRIAZIN-4(1H)-YL RADICALS

The title radicals, C19H14N3, are arranged in columns along the b axis in which the almost planar 1,2,4-triazin-4(1H)-yl ring and the phenyl ring on C3 of adjacent molecules lie alternately on top of one anothe r. Within the array, the mean interplanar distance is 3.45 Angstrom. H owever, the centers of the 1,2,4-triazin-4(1H)-yl rings, bearing most of the spin population, are 5.50 Angstrom apart. Consequently, there a re only very weak intermolecular interactions along the columns, which is in agreement with the results of static magnetic susceptibility me asurements.