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This paper reports a small family of cationic surfactants designed to bind polyanions such as DNA and heparin. Each molecule has the same hydrophilic cationic ligand and a hydrophobic aliphatic group with eighteen carbon atoms with one, two, or three alkene groups within the hydrophobic chain (C18‐1, C18‐2 and C18‐3). Dynamic light scattering indicates that more alkenes lead to geometric distortion,...