title: Bis(2-{1-[(2,4,6-trimethylphenyl)imino]ethyl}pyrrol-1-ido-κ(2)N,N')nickel(II): a supramolecular structure formed by C-H...π(arene) hydrogen bonds.
abstract: 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 identical N,N'-bidentate mono(imino)pyrrolyl ligands to an Ni(II) centre, an X-ray crystal diffraction study indicates that the two ligands show an inverted arrangement with respect to one another around the Ni(II) centre, 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 NiN4 plane. The Ni-N bond lengths are in the range 1.9072 (15)-1.9330 (15) Å and the Nimino-Ni-Npyrrole bite angles are 83.18 (6)°. The Ni-Npyrrole bond is substantially shorter than the Ni-Nimino bond. 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.
authors.affiliation: College of Chemistry and Chemical Engineering, Xi'an ShiYou University, Xi'an, Shaanxi 710065, People's Republic of China.
authors.forename: Bi Yun
authors.initials: BY
authors.lastname: Su
authors.affiliation: College of Chemistry and Chemical Engineering, Xi'an ShiYou University, Xi'an, Shaanxi 710065, People's Republic of China.
authors.forename: Xiao Teng
authors.initials: XT
authors.lastname: Li
authors.affiliation: Changzheng Engineering Co. Ltd, Lanzhou Branch, Lanzhou, Gansu 730000, People's Republic of China.
authors.forename: Jia Xiang
authors.initials: JX
authors.lastname: Wang
authors.affiliation: College of Chemistry and Chemical Engineering, Xi'an ShiYou University, Xi'an, Shaanxi 710065, People's Republic of China.
authors.forename: Xu Dong
authors.initials: XD
authors.lastname: Wang
keywords: crystal structure; hydrogen bonding; imine; nickel(II) complex; pyrrolide ligand; supramolecular chemistry