Bis(2-{1-[(2,4,6-trimethylphenyl)imino]ethyl}pyrrol-1-ido-κ2N,N′)nickel(II): a supramolecular structure formed by C—H...π(arene) hydrogen bonds

Abstract

<!?tlsb=-0.2pt>Nitrogen-based polydentate ligands are of interest owing to their flexible complexation to transition metal atoms. For the title compound, [Ni(C15H17N2)2], a transition metal complex formed by the coordination of two identicalN,N′-bidentate mono(imino)pyrrolyl ligands to an NiIIcentre, an X-ray crystal diffraction study indicates that the two ligands show an inverted arrangement with respect to one another around the NiIIcentre, which is located on a crystallographic inversion centre. The planes of the aromatic substituents at the imine N atoms of the ligands show dihedral angles of 85.91 (5)° with respect to the NiN4plane. The Ni—N bond lengths are in the range 1.9072 (15)–1.9330 (15) Å and the Nimino—Ni—Npyrrolebite angles are 83.18 (6)°. The Ni—Npyrrolebond is substantially shorter than the Ni—Niminobond. Molecules are linked into an extensive network by means of intermolecular C—H...π(arene) hydrogen bonds in which every molecule acts both as hydrogen-bond donor and acceptor. The supramolecular assembly takes the form of an infinite two-dimensional sheet.