Moessbauer studies of DNF in a cold smetic B (40.8) liquid crystalline material

Moessbauer studies were performed on a 1% by wt. solution of DNF in the liquid crystalline material 40.8, which is a smetic B liquid crystalline material. This sample produced a four-line spectrum. Two peaks showed a larger intensity than the other two. However, the quadrupole splitting between the high-intensity peaks was the same as for the two low-intensity peaks. Other probe molecules in 40.8 have led to a two-line spectrum. Therefore, this leads to the conclusion that the DNF is located at two different sites within the liquid crystal. This four-line spectrum was observed for both the crystal phase and the smetic B glass phase of 40.8. Also, the Debye temperature was measured, together with the order parameter. These results will be discussed. (orig.)