Unusually Stable Triazine‐based Organic Superstructures

Abstract

Solid-state reactions have been rapidly gaining popularity in organic chemistry owingt ot heir simplicity, efficiency,a nd selectivity compared to liquid-phase reactions. Herein, we describe the formation of superstructures through the solid-state reaction of an organic single-crystal. The superstructure of 5,5',5''-(1,3,5-triazine-2,4,6-triyl)triisophthalonitrile (TIPN) can be formed by cyclotrimerization of 1,3,5-tricyanobenzene (TCB) single crystals.T he TIPN superstructure was confirmed by single crystal X-ray diffraction and visualizedb yt ransmission electron microscopy. The superstructure has hexagonally packed 1-dimensional (1D) channels along the crystal axis.F urthermore,t he superstructure arises from interdigitated nitrile interactions in the crystal lattice,and thus has electron-beam tolerance and very high thermal stability.

Energy‐Efficient Iodine Uptake by a Molecular Host⋅Guest Crystal

“…Besides Covalent Organic Frameworks (COFs), which are characterized by polymerized strong covalent bonds, [15–17] most POCs are based on the crystallization of small molecules for which supramolecular interactions and packing effects govern the structure of the final assembly [18] . Among the POC materials, those with intrinsic porosity are mainly obtained using macrocyclic or container‐shape compounds, [2, 4, 6, 19] while those with extrinsic porosity rely on particular patterns creating hollow spaces [20–33] . In this context, macrocycle porous crystals made of cucurbit[ n ]urils (CB[ n ]) [34–38] such as CB[6] or CB[8] (Figure 1a) have a particular place.…”