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.
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