Structural Investigations of Polyacetylene and Polyphenylene by Neutron Scattering

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Abstract
Wide angle neutron scattring patterns of deuterated cis- and trans-polyacetylene (PA) and deuterated polyphenylene (PPh) doped with AsF5 have been measured. For undoped trans-PA a refined crystal structure is proposed to reproduce the neurtron scattering data. Doping of PA with AsF5 is explained on the basis of an intercalation model. Deuterated PPh has been prepared by different polyerisation procedures, variing the crystallinity of the undoped material in a wide range. Strong extra peaks are observed during doping with AsF5, wheres the crystallinity of the samples remains essentially unchanged. An intercalation model similar to AsF5.-doped graphite is proposed.