Poly‐(2,5‐furanylene Vinylene) Prepared from a Precursor Polymer Soluble in organic Solvents

Abstract

Pol 4 2 Sfuranylene vinylene), PFV) is prepared by thermal treatment of films cast from THgor CHCI, solutions of a me I hoxy precursor polymer. The sequence of reactions is described gtartin from 2,5-dimethylfuran. The new methoxy precursor is characterised by its IR and C-NhR spectra, while GPC (polystyrene calibration) gives M = 4300, M, = 1180Y), degree of polymerisation, n = 35, degree of polydispersion, dp = 2.8. UV spectra suqgest isolated furan units, in accordance with the proposedptruFture. Some premature elimination is also observed. Maximum conductivity p = 20 R' cm-is reached after doping the PFV film for 4 min in iodine vapour.

Molecular structures of tetrabromothiophene and -selenophene as determined by gas-phase electron diffraction and high-level quantum chemical calculations

“…For several decades, small aromatic rings containing a heteroatom of the chalcogen group have been used as the basic components of conjugated organic materials, and early examples include electrically conducting polymers based on furan [poly(2,5-furanylene vinylene), PFV], thiophene [poly(2,5-thienylene vinylene), PTV] and selenophene [poly(2,5-selenylene vinylene), PSV] [1][2][3]. PFV being chemically unstable, the introduction of functional groups on the rings or the vinyl spacers of the latter two later became the tools of choice to produce materials with a greater solubility, stability and processibility: in this respect methoxy groups proved particularly successful for PTV [4][5][6], while alkyl groups were used for PSV [7].…”