EPR of Naarmann-Theophilou Polyacetylene: Critical Role of InterchainInteractions

摘要

Electron-paramagnetic-resonance (EPR) experiments have been carried out onpristine Naarmann-Theophilou polyacetylene N-(CH)x. It is found that there is a significant increased interchain spain exchange in trans-(N-(CH)x) compared with that of trans-Shirakawa (CH)x. We propose that the intrachain solitons diffusion range in trans-(N-(CH)x) is greatly enhanced. Studies of spin-lattice relaxation and oriented polymers support this conclusion. We discuss possible origins for the higher conductivity of I2-doped N-(CH)x in light of the enhancement of the soliton diffusion range.