TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): A compound having porphyrin skeleton with two aryl groups, such as phenyl group, is manufactured. Another aryl group is introduced into the compound. A compound having porphyrin skeleton is halogenated, preferably brominated. The halogenated porphyrin derivative is boronized, and the boronized derivative is coupled with halogenated porphyrin derivative, to obtain biporphyrin derivative. The biporphyrin derivative is then condensed, to obtain the new fully cyclocondensed porphyrin dimer. Preferred Definitions:    M=copper, nickel or cobalt, preferably copper;    R1=-O(CH2CH2O)nCH3;and    R3=10-18C linear alkyl.    EXAMPLE - 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (in mg) (13.1) and scandium triflate (39.9) were added to dehydrated toluene solution (21 mL) of porphyrin dimer (50) of formula (A), and stirred at room temperature for 3 hours. The reaction system was purified using methylene chloride/acetone, and the solvent was distilled. The residue was further purified using methylene chloride/ethanol, and solvent was distilled to obtain a dimer of formula: C247H385Zn2N8O45 as sticky bluish black solid (32.5) with a yield of 65%. Hydrochloric acid/methanol solution (3 mL) was added to chloroform solution (20 mL) of the obtained dimer (29), and stirred at room temperature for 2 hours. The reaction system was water-washed, and then washed with saturated sodium hydrogen carbonate solution. The solvent was distilled off. Copper acetate (II) saturated methanol solution (1 mL) was added to chloroform solution (20 mL) of the residue, and stirred at room temperature for 12 hours. The reaction system was washed and the solvent was distilled off. The residue was purified using methylene chloride/ethanol, and the solvent was distilled off. The residue was further purified using methylene chloride/ethanol, to obtain a fully cyclocondensed porphyrin dimer (24) of formula: C247H385Cu2N8O45 with a yield of 83%. The dimer had liquid crystallinity in room-temperature region, and provided organic electroconductive materials with high mobility.