The synthesis and lyotropic liquid-crystalline (LLC) phase behavior of a homologous series of intrinsically cross-linkable gemini surfactants are described. These novel bis (alkyl-1, 3- diene)-based phosphonium gemini amphiphiles exhibit “normal” hexagonal (HI), Type I bicontinuous cubic (QI), and lamellar (Lα) phases in water, and can be photocross-linked with retention of phase architecture in each case. On the basis of their locations on the ...