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Dipole molecules become arranged in a highly ordered manner within zeolite pores. They are oriented nearly parallel to the straight channels and aligned collectively into one specific direction. They form arrangements different from the crystallization in the free bulk as well as different from arrangements in amorphous hosts. This polar arrangement results in (i) a lowering of the symmetry of the guest-host system compared to the host, (ii) nonlinear optical effects of second order such as second harmonic generation, (iii) a macroscopic polarization giving rise to pyroelectric effects and (iv) special phase transition phenomena in these one-dimensional systems.
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Marlow et al. (1996) studied this question.
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