Geometries and Electronic Structures of Co‐Oligomers and Co‐Polymers Based on Tricyclic Nonclassical Thiophene: A Theoretical Study

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Abstract
The geometries and electronic properties of four copolymers based on tricyclic nonclassical thiophene were studied using DFT at the B3LYP/6‐31G(d) level. Bond lengths and their alternation, electron densities at BCPs, NICS, and WBIs were analyzed and correlated with the energy gap. The results show that the degree of conjugation increases upon main chain extension. The energy gap decreased steadily with increasing degree of polymerization. Conjugation is stronger in the central than in the outer section. The results suggest that the narrow HOMO/LUMO separation of tricyclic nonclassical thiophenes can be carried over to their co‐polymers by using them as building blocks for the co‐polymers. magnified image
Funding Information
  • Youth Foundation of Chongqing Three Gorges University (2007-sxxyqn-02)
  • Applied Basic Foundation of Chongqing Municipal Commission of Education (KJ071302)
  • Natural Science Foundation of Chongqing Municipality (CTC 2006BB4341)

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