The crystal structure of 3-(9-anthracenyl)-1,5-diphenyl-verdazyl, a stable free radical

Abstract

The crystal structure of the stable free radical 3-(9-anthracenyl)-1,5-diphenylverdazyl was determined. There are four independent molecules in the unit cell (space group P ̄ 1 ). The structure was solved by direct methods. A large number of sets of initial random phases were generated in space group P1 ( Z = 8, 256 non-hydrogen atoms) and the best solution gave the location of 250 atoms. The four symmetry-independent molecules have a variety of different conformations indicating considerable conformational freedom.