On the Transition Temperature of Molecular Rotation in Long-Chain Compounds With the Discontinuous Model

抄録

The rotational transition, which is found in some long-chain compounds, is discussed at the level of Bethe’s approximation, assuming that the rigid molecules occupy the rigid two-dimensional triangular lattice points, and that they can take only three orientations around their axes. Four kinds of interaction energies must be considered. The calculations are made concerning what values of interaction energies make the transition to the paraffin-typed arrangement possible, and concerning how the transition temperature depends on these energy values. Some reasonable results are obtained. At the same time, another type of the ordered arrangement is also investigated, in which all molecules take the same orientation.