Synthesis, molecular structure and intramolecular aromatic‐ring stacking interaction of a novel binuclear Cu(II) complex with 1,10‐phenanthroline and phenylacetate

The complex [Cu (phen) 2 (POAc) 3 ]ClO 4 ·4h 2 O has been synthesized and investigated by elemental analysis, IR spectroscopy and X‐ray diffraction methods, where phen = 1,10‐phenanthroline, POAc − = phenylacetate group). The complex crystallizes in the triclinic space group Pi with two molecules in a unit cell of dimensions a = 1.0579(2) nm, b = 1.2423(3) nm, c = 1.9190(4) nm, a = 71.84(1)°, β = 80.50(2)°, Y = 88.60(1)°, V = 2.3625(9) nm 3 , R =0.0407 and R w = 0.0656. The complex results from bridging of two Cu (phen) 2+ units by three carboxylate groups, and each Cu 2+ ion is in a distorted square pyramidal geometry with two nitrogen atoms of phen and three carboxylate oxygen atoms of POAc − . It has been showed that intramolecular stacking interactions occur between the phenyl moieties of POAc − and aromatic rings of phen, leading to a novel molecule structure with two coordinating modes of carboxylate ligands, of which two phenylacetates are μ 2 —carboxylate— O ‐bridging ligands, and the other is a μ 2 —carboxylate— O , O ′‐bridging ligand.