Electronic structure of polyacetylene — finite models of cis-form —

Electronic and vibrational structures of finite cis-polyenes are investigated in order to elucidate the origin and mechanism of enhanced IR active vibrational intensities. The remarkable charge polarization generated by one- or two-electron transfer from the polyene segment to the electron accepting dopant is confirmed as the origin, which is common to trans and cis-form of (CH)x.