Deuteration Effect of Ferroelectricity and Permittivity on Homochiral Zinc Coordination Compound

Hydrothermal [2+3] cycloaddition reactions of <i>N</i>-4‘-caynobenzylcinchonidine bromide (CBCBr) with NaN<sub>3</sub> in the presence of ZnBr<sub>2</sub> offer a novel Zn dimer (CBC−N<sub>4</sub>)<sub>2</sub>ZnBr<sub>2</sub>(N<sub>3</sub>)<sub>2</sub>(X<sub>2</sub>O), X = H for <b>1</b> and D for <b>2</b>) in which the reactant Br<sup>-</sup> and N<sub>3</sub><sup>-</sup> take part in the coordination to Zn. The measurements of ferroelectricity and permittivity of <b>1</b> and <b>2</b> show that there exists a large deuterated effect both in ferroelectric behavior (40% increase) and in dielectric constant (2.75 times increase), which is unprecedented in metal coordination compounds.