Towards new nanoporous biomaterials: self-assembly of sulfopillararenes with vitamin D3 into supramolecular polymers†
Novel water-soluble, deca-substituted pillararenes containing thiasulfate and thiacarboxylate fragments were synthesized and characterized. UV-vis, 2D 1H–1H NOESY and DOSY NMR spectroscopy revealed the ability of pillararenes containing thiasulfate fragments to form an inclusion complex with cholecalciferol (vitamin D3) in a 1 : 2 ratio (lg Kass = 2.2). Using DLS and SEM it was found that upon concentration and/or evaporation of the solvent, the supramolecular polymer (pillararene/vitamin D3 (1 : 2)) forms a porous material with an average wall diameter of 53 nm. It was shown that the supramolecular polymer is stable during photolysis by UV radiation (k1 = 1.7 × 10−5 s−1).
- This article is part of the themed collection: Supramolecular chemistry in OBC