cis-Bis{1-[(4-nitro-phen-yl)diazen-yl]-2-naphtholato}dipyridine-nickel(II).

In the title compound, [Ni(C(16)H(10)N(3)O(3))(2)(C(5)H(5)N)(2)], the Ni(II) cation is in a distorted octa-hedral NiN(4)O(2) coordination by two independent bidentate 1-[(4-nitro-phen-yl)diazen-yl]-2-naph-thol-ate anions and two pyridine ligands. C-H⋯O inter-actions between aromatic rings and the O atoms of the nitro substituents build up a two-dimensional supra-molecular arrangement parallel to (100).

Isomorphous dichloro- and dibromo(2-methyl-2-phenylpropyl)phenylstannane, both displaying the same intramolecular pi-pi interaction at 120 K.

The title compounds, dichloro- and dibromoneophylphenyltin, [SnCl(2)(C(6)H(5))(C(10)H(13))] and [SnBr(2)(C(6)H(5))(C(10)H(13))], respectively, are remarkable for the 'U' shape of the molecules, whereby the two phenyl groups are brought face-to-face in an arrangement that permits intermolecular C-H.pi bonds to connect the molecules into layers parallel to (100). Intermolecular Sn-halide bonds are notably absent from the structures.

catena-Poly[[triphenyltin(IV)]-mu-hydroxo-kappa2O:O] at 120 K.

The structure of the title compound, [Sn(C(6)H(5))(3)(OH)](n), has been re-investigated at 120 (2) K. The hydroxyl H atom was readily located and the threefold coordination about the O atom is planar. There are no hydrogen bonds involving the hydroxyl group, either as donor or as acceptor.