Multiluminescent Hybrid Organic/Inorganic Nanotubular Structures: One‐Pot Fabrication of Tricolor (Blue–Red–Purple) Luminescent Parallepipedic Organic Superstructure Grafted with Europium Complexes

This article focuses on an innovative one‐pot fabrication of organic/inorganic hybrid parallepipedic tubes with rectangular cavities displaying multicolor luminescence. Firstly, using a novel back‐to‐back coupled 2,6‐di‐pyrazol‐1‐ylpyridine ligand, blue‐emitting several‐micrometer‐long (ca. 50 μm) parallepipedic organic nanotubes with rectangular cavities were fabricated in THF/water via supramolecular (H‐bonding and π–π stacking) and solvent‐assisted self‐assembly. Secondly, in the same pot, the ligand molecules available on the surface of the ligand nanotubes were reacted with Eu(tta)₃ molecules at the solid/liquid interface to form a layer of red‐emitting Eu(III) complex coating on the inner and outer surface of the tubes. The resultant organic/inorganic hybrid parallepipedic nanotubes fabricated using this novel bottom‐up one‐pot technique display tricolor (blue–red–purple) luminescence, i.e., blue and red dual emission from the organic ligand and the Eu(III) complex, respectively, and a purple color due to the mixing of the two colors. This simple technique signifies an innovative and important method in the development of bottom‐up nanotechnology of multiluminescent organic/inorganic hybrid nanotubes.