Layer-by-layer assembled membranes of protonated 18-azacrown-6 and polyvinylsulfate and their application for highly efficient anion separation.

Ultrathin separation membranes were prepared upon alternating electrostatic adsorption of 1,4,7,10,13,16-hexaazacyclooctadecane (18-azacrown-6, hexacyclen, aza6) and polyvinylsulfate on porous polyacrylonitrile/polyethylene terephthalate (PAN/PET) substrates. The resulting composite membranes were highly permeable for electrolyte solutions, but the selectivity in ion transport was poor (alpha(Cl-/SO42-) = 2). However, after a treatment of the membrane with 0.

Electrostatic layer-by-layer assembly of ultrathin films containing hexacyclen and p-sulfonatocalix[n]arene macrocycles.

Formation and characteristic properties of new layer-by-layer (LbL) assembled ultrathin films based on 1,4,7,10,13,16-hexaazacyclooctadecane (aza6) and p-sulfonatocalix[n]arenes with n=6 (calix6) and n=8 (calix8) are described. In particular, multilayered films of aza6 and polystyrenesulfonate (PSS), aza6 and calix8 or calix6, aza6 and hexacyanoferrate(II) (HCFII), calix8 and lanthanum(III), and calix8, 18-crown-6 and lanthanum(III) were investigated. The films were prepared upon alternating electrostatic adsorption of the cationic and anionic compounds from aqueous solution at charged substrates.