DIPOLE CHAINS IN ZEOLITE PORES - THE EFFECTS OF SYMMETRY-BREAKING

Dipole molecules become arranged in a highly ordered manner within zeo lite pores. They are oriented nearly parallel to the straight channels and aligned collectively into one specific direction. They form arran gements different from the crystallization in the free bulk as well as different from arrangements in amorphous hosts. This polar arrangemen t results in (i) a lowering of the symmetry of the guest-host system c ompared to the host, (ii) nonlinear optical effects of second order su ch as second harmonic generation, (iii) a macroscopic polarization giv ing rise to pyroelectric effects and (iv) special phase transition phe nomena in these one-dimensional systems.