Abstract: | Four new bent-core mesogens containing biphenyl moieties are reported. All these, except the first homologue, exhibit B7 and B4 banana phases, both of which are known to have a helical structure. The B7 to B4 phase transition is very rare, this being perhaps only the second report of the observation of such a phase sequence. The first homologue exhibits only one mesophase X1 with textural features reminiscent of the B1 phase. All the compounds synthesized are characterized by spectral data. The mesophases exhibited by these compounds are characterized by polarizing optical microscopy, differential scanning calorimetry and X-ray studies. |