Abstract
Molecular dynamics (MD) simulations combined with temperature-dependent IR spectroscopic measurements were used to study phase transitions in molecular crystals of the mesogenic diol 4,4'-bis(11-hydroxy-1-undecyloxy)biphenyl. DSC measurements revealed four phase transitions in this molecular crystal at approximately 327.1 K, 389.8 K, 419.1 K and 431.9 K. Analysis of the dynamic trajectories at temperatures of 300 K, 360 K, 400 K and 480 K revealed changes in conformation of the mesogenic diol molecules and consequently changes in crystal packing and crystal structure in the temperature range 300-480 K and enabled us to understand the mechanism of the phase transitions.
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