Abstract
The thermodynamic behavior of dipolar molecules in a system of parallel straight channels (such as para-nitroaniline (pNA) adsorbed in the channels of AIPO 4 -5 molecular sieves) was studied theoretically. The interaction between the molecules is considered to be a superposition of long range interaction due to all dipoles in the crystal and nearest-neighbor interaction within the individual pore. The dipoles in a pore are regarded as a one-dimensional system. This leads to a van der Waals-type equation of state. A phase transition exists below the critical temperature. For a real system (pNA in AlPO 4 -5), the isotherms, the critical point, and the coexistence region are calculated.
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