Abstract
Several substituted phosphonium phenylacetylene monomers and the corresponding polymers were prepared through quaternization of trimethyl (or phenyl) phosphines with phenylacetylene bromide and subsequent polymerization of quaternized monomers. A nitrogen analogue, poly(1-triethyl ammonium bromide 2-phenylacetylene) was prepared for comparison. In contrast to the phosphonium monomers the quaternary ammonium analogue polymerized spontaneously and could not be isolated from its polymer. Spectroscopic and thermal properties of these polymers were studied. Ionic phosphonium polyacetylenes are characterized by higher u.v. absorption shifts toward the visible than the ammonium polyphenylacetylene and the non-ionic polyphenylacetylene and polyphenylacetylene bromide. The extent of conjugation in the main chain of the phosphonium polymers increases with the decreasing size of the substitutent, as does the thermal stability of the monomers and polymers.
Published Version
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