A frustrated packing model for the B6-B1-SmAPA sequence of phases in banana shaped molecules
Raman Research Institute, C.V. Raman Avenue, Sadashivanagar, Bangalore, 560 080, India
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Published online: 18 October 2005
A vast majority of compounds with bent core or banana shaped molecules exhibit the phase sequence B6-B1-B2 as the chain length is increased in a homologous series. The B6 phase has an intercalated fluid lamellar structure with a layer spacing of half the molecular length. The B1 phase has a two dimensionally periodic rectangular columnar structure. The B2 phase has a monolayer fluid lamellar structure with molecules tilted with respect to the layer normal. Neglecting the tilt order of the molecules in the B2 phase, we have developed a frustrated packing model to describe this phase sequence qualitatively. The model has some analogy with that of the frustrated smectics exhibited by highly polar rod like molecules.
© EDP Sciences/Società Italiana di Fisica/Springer-Verlag, 2005