Structural relationships in the solid‐state synthesis of poly(bis‐phenyl glutarate diacetylene)

This study was undertaken to determine the crystal structure of poly(bis‐phenyl glutarate diacetylene) (poly(BPG)). It was found that this material crystallizes in a C2/c (centrosymmetric) space group. The x‐ray refinement revealed a solid solution of the monomer and polymer. It was determined that the only movement that occurs during polymerization is in the diacetylene rod (a rotation of 33°) and in adjacent phenyl groups (a rotation of 19° and a swing of 6°), while all other atomic positions in the side group remain essentially the same. An infrared investigation and the final refined atomic coordinates with their standard deviations indicates that the BPG crystal was polymerized to an extent of 35%.