Abstract

Ab initio self-consistent field linear combination of atomic orbitals (SCF LCAO) crystal orbital band structure calculations for acetylene-methylacetylene copolymers of different acetylene contents (33.3mol.% and 66.7mol.% respectively) in polymers and the Li-doped systems are reported. The copolymers are derived from trans-polyacetylene by replacing some of the hydrogen atoms with methyl groups. The results are compared with those of polyacetylene (pure and Li doped), and the influence of methyl groups on the band structures is investigated. The charge distributions of the systems on the basis of Mulliken population analysis are discussed. The results agree well with experiment.

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