A biaxial nematic phase had been predicted with D2h symmetry, wherein the mesogen’s long and short transverse axes are simultaneously aligned along the two orthogonal, primary and secondary directors, n and m, respectively. The unique low-angle x-ray diffraction patterns in the nematic phases exhibited by three rigid bent-core mesogens clearly reveal their biaxiality. The results of x-ray diffraction can be readily reproduced by ab initio calculations that explicitly include the bent-core shape in the form factor and assume short-range positional correlations.
Physical Review Letters
Copyright 2004 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.92.145506.
Acharya, Bharat R.; Primak, Andrew; Kumar, Satyendra (2004). Biaxial Nematic Phase in Bent-Core Thermotropic Mesogens. Physical Review Letters 92(14) doi: 10.1103/PhysRevLett.92.145506. Retrieved from https://oaks.kent.edu/phypubs/10