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, H 2 NCOCH 2 CH 2 — C , O , are described. The compounds are [ 1 : (H 2 NCOCH 2 CH 2 — C , O ) 2 SnX 2 : X = Cl (two polymorphs), X = N 3 and the mixed halide, X = Cl/I] and the 1,2-dithiolates, [ 1 : X 2 = 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, {[NBu 4 ] : [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 : X 2 = 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 NH 2 as the donor species.