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- W2183208086 abstract "Trans-polyacetylene is unstable in air and oxygen defects are known to occur. There are a number of speculations on the structure of these defects but their precise nature is unknown. We have performed 13C NMR including magic angle sample spinning (MAS) on a 5% 13C enriched polyacetylene sample which was exposed to air under normal pressure. In the Open image in new windowFig. 1Room temperature 13C NMR spectra of trans-polyacetylene with oxygen defects. Due to magic angle sample spinning with a rotation frequency of 1.7 kHz (a) and 1.3 kHz (b) highly resolved isotropic values of the chemical shift tensors and corresponding sidebands can be seen. Frequencies and integrated intensities of all lines are depicted in the lower part, showing two different tensors. The Larmor frequency is 45.7 MHz.slow spinning regime, where the rotation frequency is less than the chemical shift anisotropy, sidebands are observed which have been analyzed according to the Herzfeld and Berger method [1] to yield the principal elements of the chemical shift tensor in polyacetylene recently [2], A review of these NMR techniques can be found in reference [3]." @default.
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- W2183208086 date "1985-01-01" @default.
- W2183208086 modified "2023-09-27" @default.
- W2183208086 title "13C-NMR Investigation of an Oxygen Defect in trans-Polyacetylene" @default.
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- W2183208086 doi "https://doi.org/10.1007/978-3-642-82569-9_50" @default.
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