Synthesis, Crystal Structure and Piezoelectric Property of Noncentrosymmetric Compound with Betti Base

The molten reaction of 2-naphthol, 2-hydroxybenzaldehyde and tetrahydropyrrole at about 120 degrees C yields 1-[(2-hydroxyphenyl)(pyrrolidin-1-yl)-methyl]naphthalen-2-ol, whose co-crystal (1) with 2-naphthol was characterized by X-ray single crystal diffraction, XRPD and IR. Compound 1 crystallizes in a noncentrosymmetric space group (Fdd2) with unit cell dimensions of a=2.9395(9) nm, b=3.468(3) nm, c=0.8013(8) nm, V=8.170(13) nm(3), alpha=beta=gamma=90.0 degrees and Z= 8 [ at 293(2) K]. The piezoelectric measurement result shows compound 1 is piezoelectrically active material with d(33) value of ca. 6.2 pC/N. Temperature-and frequency-dependent dielectric constant of compound 1 were measured and showed no distinct dielectric anomaly, which suggest no phase transition within the measured temperature range (100-410 K).