Single Crystal Monomer to Single Crystal Polymer Reaction Activated by a Triplet Excimer in a Zipper Mechanism

A combined experimental and theoretical study focused on the elucidation of the polymerization mechanism of crystal monomer to crystal polymer reaction of a bisindacene compound in the solid state has been carried out. The experimental description and characterization of the polymer product have been reported elsewhere and, in this article, we address the first detailed description of the polymerization process. This reaction pathway consists in the initial formation of a triplet excimer state that relaxes to a intermolecular bonded triplet state that is the starting point of the propagation step of the polymerization. The overall process can be visualized in the monomer starting state as an open zipper in which a cursor or slider is formed by light absorption and the whole zipper is then closed by propagation of the double cursor. To this end, variable-temperature electron spin resonance, femtosecond transient absorption spectroscopy and vibrational Raman spectroscopic data have been implemented in combination with quantum chemical calculations. The presented mechanistic insight is of great value to understand the intricacies of such important reaction, and to envisage and diversify the products produced by it.