Abstract
In order to obtain the materials with large third-order nonlinear optical properties, polydiacetylenes (PDAs) having π-conjugation between polymer backbone and substituents were synthesized by proper crystal engineering. For the monomers for PDAs aromatic rings directly bound to main chain, one of two substituents bonding to the diacetylene (DA) moiety was selected from those of non-polymerizable symmetrical DA monomers. The highest χ (3) and the expected smallest dihedral angle between the polymer backbone and aromatic rings was already realized in one of the derivatives. PDAs with acetylenic and diacetylenic groups directly bound to the main chain were synthesized by polymerization of triyne and tetrayne compounds, respectively. The diacetylenic substituents of the polymers from the latter ones could be polymerized to give di (polydiacetylene) s, where two PDA polymer backbones were conjugated.
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