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A bstrac t. In this paper, we describe the effect o f iodine doping on the structure and electrical properties o f crow n-ether-substituted phthalocyanines. For the doped phthalocyanines, a layered tw o-dim ensional structure w as found. A.c. im pedance spectroscopy revealed that doping strongly increases the bulk electronic conductivity o f the “crowned " phthalocyanines and their alkali-metal picrate com plexes. The intermolecular barriers for conductivity were not affected by the iodine dopant. In troduction Phthalocyanines (Pc's) are known to exhibit sem icon d u ct ing properties1. An important constraint for achieving these properties is a face-to-face-stacked arrangement o f the phthalocyanines with small interplanar distances. This stacking provides an extended pathway for electronic charge migration. A second requisite is the presence o f free charge carriers, that is, the m olecules must have either a fractionally occupied valence or a conductance band. Thi