Synthesis and structure of a mixed crystal containing tris(4-pyridiniumyl)-1,3,5-triazine and benzenetetracarboxylate ions: constructing a new photochromic molecular system via self-assembly

A new type of photochromic supramolecule is designed and synthesized via the suitable combination of two nonphotoactive organic molecules tpt and btec. The connections built by strong intermolecular forces provide the possibility for contact electron transfer. Reversible color changes of the molecular switch are observed upon exposure to light irradiation.