Electrocrystallization and crystal structure are reported for the 6:1
salt of perylene (PE) and hexafluorophosphate. The three-dimensional c
rystal structure contains PE dimers with very small intradimer and lar
ge interdimer separation. Measurements of static magnetic susceptibili
ty and d.c. electrical conductivity characterize (PE)(6)PF6 as an orga
nic semiconductor with comparatively large activation energy and one C
urie-like radical spin per formula unit.