Abstract
The present paper deals with the study of conjugated chains of a trans—cisoidal poly(α-ethynylnaphthalene), (α-EN), obtained by bulk polymerization of α-EN with (PPh3)2·NiBr2. Based on the results obtained from electronic spectra and electrical conductivity measurements, using the fractions with molecular weight between 3732 and 528, a polymer structure built up from interrupted conjugated blocks is proposed. It is assumed that this interruption of the electronic conjugation system has structural reasons i.e., it is given by the rotation of parts of the polymer chain around some C—C single bonds, thus hindering the complete overlapping of certain π orbitals. These conjugated blocks have 3—4 conjugated or partial conjugated monomeric units. This structure could explain the low values of electrical conductivity as well as the paramagnetic centers of polyacetylenes with aromatic substituents.
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Simionescu, C., Dumitrescu, S. & Percec, V. On the Polymerization of Acetylenic Derivatives. XXIV. Some Structural Peculiarities of Poly(α-ethynylnaphthalene). Polym J 8, 313–317 (1976). https://doi.org/10.1295/polymj.8.313
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DOI: https://doi.org/10.1295/polymj.8.313