Magneto-Structural and Computational Study of a Tetranuclear Copper Complex Displaying Carbonyl-π Interactions

A tetranuclear copper(II) complex (1) was synthesized using 2-hydroxy-N-(quinolin-8-yl)acetamide ligand. Single-crystal X-ray diffraction studies revealed that the complex consists of a distorted Cu 4 O 4 core in which the four copper(II) ions are linked by alkoxo bridges. X-ray analysis also evidenced intra-molecular noncovalent carbonyl-π interactions. Those interactions that are encountered between lone-pair electrons (of the amide oxygen atoms here) and π* orbitals of aromatic rings,