Electrocrystallization of the dicyanophthalocyaninatocobalt(III) anion, [Co(Pc)(CN)(2)](-), gives three kinds of neutral radical crystals which are different in dimensionality. One-dimensional arrays of Co(Pc)(CN)(2) are formed in the bromoform containing crystal, Co(Pc)(CN)(2) . 2CHBr(3). Two-dimensional sheets of Co(Pc)(CN)(2) are formed in a crystal of Co(Pc)(CN)(2) . 2CHCl(3). A three-dimensional network of Co(Pc)(CN)(2) is formed in Co(Pc)(CN)(2) . 2H(2)O. The conductivity anisotropy is in good agreement with the dimensionality of the pi-pi interaction. The conductivity value, which is rather high as neutral radical solids, is systematically increased with increasing the dimensionality, suggesting that the conduction-limiting factor in a neutral radical system, on-site Coulomb repulsion energy, can be reduced by increasing the dimensionality.