Fully pi-conjugated oligopyrromethene helices coiling two Cu(II) ions were obtained from oxidative cleavage of expanded porphyrins. The Smoothly conjugated backbone structures, distinct near-IR absorption bands, and extended spin-density distributions demonstrated the effective pi-electron delocalization over the whole helices. Magnetic susceptibility and electron spin resonance measurements revealed the antiferromagnetic interaction between the internal Cu(II) ions.