Synthesis, molecular structure and intramolecular aromatic-ring stacking interaction of a novel binuclear Cu(II) complex with 1,10-phenanthroline and phenylacetate
Abstract
The complex [Cu (phen)2(POAc)3 ]ClO4·4h2O 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) nm3, R =0.0407 and Rw = 0.0656. The complex results from bridging of two Cu (phen)2+ units by three carboxylate groups, and each Cu2+ 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 μ2—carboxylate—O-bridging ligands, and the other is a μ2—carboxylate—O,O′-bridging ligand.
