Electron-nuclear double-resonance determination of the C13 and H1 hyperfine tensors for polyacetylene

Abstract

Pristine 98% C13-enriched cis-polyacetylene has been investigated by electron-nuclear double-resonance spectroscopy at temperatures between 77 and 300 K. Spectra are characterized by two and only two H1 and C13 hyperfine tensors. The relative magnitudes and symmetry of the tensor elements established that the paramagnetic electron resides in a delocalized π orbital. Experimental results indicate that the delocalized electron is constrained to a potential well of approximately 100 width. © 1983 The American Physical Society.