Two proposals are: 1. The liquid crystal of para azoxyanisol consists of molecules lying parallel. It is strongly optically anisotropic. The transparent liquid is optically isotropic and the molecules, if there is structure, are arranged so that the molecular anisotropy cancels. 2. The nature of the liquid crystal is as just stated. The transparent liquid consists of cybotactic groups with indefinite boundaries with regularity marked within say 30 Å.u. diameter and with irregularity between the regularities. The liquid crystal probably consists of approximate like orientation of these minor groups in a group large enough to show optical anisotropy. The experiments of Letner show that the X-ray diffraction curves in the two states are similar yet different, the difference in intensity of the peak corresponding to the greater coherent diffraction in the liquid crystal. This is in favor of the second proposal as contrasted with the first of Kazt.
Proceedings of the Iowa Academy of Science
©1935 Iowa Academy of Science, Inc.
Stewart, G. W. and Letner, H. R.
"The Liquid Crystalline and Isotropic States with Special Reference to Para Azoxyanisol,"
Proceedings of the Iowa Academy of Science, 42(1), 153-153.
Available at: https://scholarworks.uni.edu/pias/vol42/iss1/64