Solid-State Polycondensation via Ionic-to-Covalent Bond Transformation to Control Polymer Structure: Preparation of Porphyrin-Based Ladder Polymer
journal contributionposted on 17.02.2015, 00:00 by Masato Suzuki, Kohei Yokota, Hiroe Tsuchida, Kazuhisa Yamoto, Masayuki Nagata, Shin-ichi Matsuoka, Koji Takagi, Kohei Johmoto, Hidehiro Uekusa
The controlled formation and the regular arrangement of polymer chains have been performed by novel solid-state polycondensation including the ionic-to-covalent bond transformation in the ionic molecular crystals. The combination of the tetra-anion and -cation of tetraphenylporphyrin derivatives, tetrakis(benzylpyridinium carboxylate), was found to form layered crystal structures and underwent thermal solid-state polycondensation, thus, releasing the pyridine and forming the benzyl ester linkages. Powder X-ray diffraction, when compared to the monomer crystal structure data, suggested that the ladder polymer was produced with a layered structure.