Anion−π Interactions in a Carousel Copper(II)−Triazine Complex

Unprecedented anion−π interactions are revealed for the electron-poor triazine rings in [L2(CuCl)3][CuCl4]Cl (L = hexakis(pyridin-2-yl)-[1,3,5]-triazine-2,4,6-triamin), where both the chloride ion and a Cl atom of [CuCl4]2- are located ∼3.15 Å above the ring centroids, in excellent agreement with theoretical predictions for a Cl-···triazine complex. This confirms the importance of attractive anion−π interactions for the supramolecular assembly of complexes with π-electron-deficient heteroaromatics.