Bis(2-amidoethyl)tin compounds, (H₂NCOCH₂CH₂—C,O)₂SnX₂, and complexes: supramolecular arrays derived from hydrogen bonds involving the amido and X units

Abstract

Various tin complexes containing the bidentate 2-amidoethyl ligand, H₂NCOCH₂CH₂—C,O, are described. The compounds are [1: (H₂NCOCH₂CH₂—C,O)₂SnX₂: X = Cl (two polymorphs), X = N₃ and the mixed halide, X = Cl/I] and the 1,2-dithiolates, [1: X₂ = 1,2-dithiole-3-thione-4,5-dithiolate (dmt) and 1,3-dithiole-2-thione-4,5-dithiolate (dmit)]. Also discussed are the structures of co-crystalline 1 : 1 : 1 complexes, {[NBu₄] : [X] : (1)},namely (2: X = Br and I). The remaining compound considered is the hydrogen bonded 2 : 1 complex of (1: X = Cl) with 18-crown-6, 3.

In all of the structures, tin is six-coordinate in an octahedral environment distorted, primarily and most markedly in (1: X₂ = dmt or dmit), by the bite angle of the bidentate ligands. The creation of three-, two- and one-dimensional connectivity in the supramolecular structures is dominated by intermolecular hydrogen-bonds with the amide NH₂ as the donor species.