Three-dimensional Porous Organic Semiconductor Based on Fully sp2-Hybridized Graphitic Polymer.

: Dimensionality plays an important role in the charge transport properties of organic semiconductors. Although three-dimensional semiconductors, such as Si, are common in inorganic materials, imparting electrical conductivity to covalent three-dimensional organic polymers is challenging. Here, we report the synthesis of a  three-dimensional  π -conjugated porous organic polymer (3D p-POP) using catalyst-free Diels-Alder cycloaddition polymerization  followed by acid-promoted aromatization.  With a surface area of 801 m 2  g -1 , full conjugation throughout the carbon backbone, and an electrical conductivity of 6(2)  x  10 -4  S cm -1  upon treatment with I 2  vapor, the 3D p-POP represents the first member of a new class of permanently porous 3D organic semiconductors.