Syntheses, crystal structures and luminescent properties of six new d10 transitional metal coordination polymers based on bis(benzimidazole) ligands

Abstract

Six new coordination polymers, [CdCl2(bbim)]n (1), [ZnCl2(bbbm)]n (2), [ZnCl(HCOO)(bbbm)]n (3), [Cd(PhCOO)2(bbim)]n (4), [Cd(PhCOO)2(bbbm)]n (5), and {[Zn(ip-OH)(bbim)]·DMF}n (6) [bbim=1,1′-(1,4-butanediyl)bis(2-methylbenzimidazole), bbbm=1,1′-(1,4-butanediyl)bis(benzimidazole), H2ip-OH=5-hydroxylisophthalic acid], have been prepared and characterized by elemental analysis, infrared spectra and X-ray single-crystal diffraction. Complexes 1–5 have one-dimensional (1D) chain structures. Complexes 1, 3 and 4 possess similar 1D meso-helical chain structures, which are extended into 2D or 3D supramolecular network through intermolecular hydrogen-bonding, C–H⋯π and π⋯π interactions. Complexes 2 and 5 exhibit similar 1D infinite helical chains. The 1D chains further form a three-dimensional (3D) supramolecular structure through intermolecular hydrogen-bonding and π⋯π interactions in 2, but form a 2D supramolecular layer via C–H⋯π interactions in 5. Complex 6 possesses a 2D 44-sql network. Furthermore, luminescent properties and thermal stabilities of 1–6 were also investigated.