Abstract
AbstractThe dielectric and pyroelectric properties of monomer and polymer single crystals of substituted diacetylenes carrying polar side groups are presented for four examples: NP/4‐MPU, TS/FBS, DNP and IPUDO. Large and anisotropic permittivities are generally observed. The symmetrically disubstituted diacetylenes IPUDO and DNP show spontaneous electric polarization despite of their symmetric molecular unit in polymer and/or monomer crystals at room or low temperature, respectively. Polar crystals of the unsymmetrically substituted diacetylenes NP/4‐MPU and TS/FBS can be grown from appropriate solvents. However, polymorphism is an obstacle to a systematic tailoring of dielectric properties of diacetylene single crystals.
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