Self-assembly and characterization of a 2D polymer containing hexanuclear 78-membered organotin macrocycles and a 1D right-handed helical organotin chain

Abstract

Two seven-coordinate organotin complexes, namely, [(Me2Sn) (μ-L) (4,4′-bipy)0.5(CH3OH) (DMF)]n (1) and [(Me2Sn) (μ-L) (1,10-phen)]n (2) (H2L = 6,6′-dithionicotinic acid, 4,4′-bipy = 4,4′-bipyridine and 1,10-phen = 1,10-phenanthroline), were synthesized in a 1:1:1 M ratio reaction of Me2SnCl2, 6,6′-dithionicotinic acid and different N-donor ligands. Both complexes have been characterized by elemental analysis, IR, PXRD, TGA, and X-ray crystallography. The structural analysis reveals that complex 1 contains hexanuclear 78-membered macrocycles which further construct a 2D wavelike polymeric structure, while complex 2 displays 1D right-handed helical chain. Complex 1 is further linked into a 3D supramolecular architecture through the intermolecular C13-H13B⋯O2 interactions, and complex 2 is connected into a 2D supramolecular structure by the intermolecular C14-H14⋯N3 interactions. In such a system, both the μ-L2− anion ligand and nitrogen-containing ligands act as bipodal linkers facilitating the formation of metal-organic frameworks.