Abstract
We have applied 13C cross-polarization (CP) powder- and MAS-NMR to cis- and trans-polyacetylene. All three elements of the chemical shift tensor ( σ 11, σ 22, σ 33) were determined in p.p.m. with respect to TMS as: (a) Cis; σ 11 = −228, σ 22 = −139, σ 33 = −17; (b) Trans; σ 11 = −234, σ 22 = −146, σ 33 = −34.
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