The soluble (phthalocyaninato)- and (2,3-naphthalocyaninato)cobalt(II) complexes (t-Bu)(4)PcCo, 2,3,9,10,16,17,23,24-(C7H15)(8)PcCo, 1,4,8,11,15,18,22,25-(C7H15)(8)PcCo, and (t-Bu)(4)2,3-NcCo react with cyanogen with formation of cyano-bridged oligomers of the type ([MacCo(CN)](n)). The same products are also prepared via an earlier developed method by reaction of the (phthalocyaninato)cobalt(II) compounds with KCN via K[MacCo(CN)(2)] complexes and treatment with water. The conductivities of the obtained cyano-bridged systems ([MacCo(CN)](n)) are measured, and [(t-Bu)(4)-2,3-NcCo(CN)](n) shows a remarkable conductivity of 8 x 10(-2) S/cm.