Facet-Selective 2D Self-Assembly of TiO₂ Nanoleaves via Supramolecular Interactions

Using catechol-group-terminated Zn(II)−porphyrin (ZnP) to functionalize the single-crystalline TiO 2 nanoleaves and coordinate ZnP with trans -2,2′-ethylene 4, 4′-bipyridyl ( 1 ), we demonstrate the self-assembly of TiO 2 nanoleaves based on a supramolecular interaction. Compound 1 cross-links the adjacent TiO 2 nanoleaves along the [101] face, results in a facet-selective, self-assembled, 2D stacking structure. This observation suggests that supramolecular interactions offer a promising route to control anisotropic nanomaterials into designed geometry.