2,6-Bis(1-benzyl-1H-1,2,3-triazol-4-yl)pyridine and its octahedral copper complex

Abstract

In the tridentate ligand 2,6-bis¬(1-benzyl-1H-1,2,3-triazol-4-yl)pyridine, C₂₃H₁₉N₇, both sets of triazole N atoms are anti with respect to the pyridine N atom, while in the copper complex aqua¬[2,6-bis¬(1-benzyl-1H-1,2,3-triazol-4-yl)pyridine](pyridine)(tetra¬fluoro¬borato)copper (II) tetra¬fluoro¬borate, [Cu(BF₄)(C₅H₅N)(C₂₃H₁₉N₇)(H₂O)]BF₄, the triazole N atoms are in the syn-syn conformation. The coordination of the Cu^II atom is distorted octa¬hedral. The ligand structure is stabilized through inter¬molecular C-H N inter-actions, while the crystal structure of the Cu complex is stabilized through water- and BF₄-mediated hydrogen bonds. Photoluminiscence studies of the ligand and complex show that the ligand is fluorescent due to triazole-pyridine conjugation, but that the fluorescence is quenched on complexation.