A triply fused copper porphyrin dimer, when site-specifically modified on its periphery with hydrophobic and hydrophilic wedges (1(C12/TEG)), self-assembles into a columnar liquid crystalline (LC) mesophase over a wide-temperature range from -17 to 99 degrees C but gives rise to an amorphous solid when modified with only hydrophobic (1(C12/C12)) or hydrophilic wedges (1(TEG/TED)). ALC film, of 1(C12/TEG) displays at 16 degrees C a top-class one-dimensional electron mobility (0.27 cm(2)/V.s), as evaluated from its maximum flash-photolysis time-resolved microwave conductivity.